volume 2 of tender documents technical specification and ... · of tender documents technical...

Volume 2

of

TENDER DOCUMENTS

Technical Specification

And

Bill of Quantities

HVAC WORKS FOR BUILDINGS FOR

NATIONAL CENTRE FOR SUSTAINABLE COASTAL MANAGEMENT

CHENNAI

Architects HVAC Consultant

M/S. McD Built Environment Research Laboratory

Pvt. Ltd.

#1354,9th

cross,80 feet road,

JP Nagar, 1St

phase, Bangalore-560078

Phone: 080-41214020

www.mcdberl.com

Tender Document for NCSCM @ CHENNAI

Arch: Flying Elephant Studio , Consultants: McD BERL, Bangalore of 118

INDEX:

01. INDEX SHEET 2 02. SPECIAL CONDITIONS 3

03. BASIS OF DESIGN 8 04. SYSTEM DESCRIPTION 13 05. GENERAL INFORMATION 18 06. HEAT LOAD SUMMARY 35 07. TECHNICAL DATA 37 08. TEST DATA 58 09. QUALITY CHECK LIST 64 10. GUIDE LINES FOR PROJECT EXECUTI 67 11. SPECIFICATION OF EQUIPMENTS & MATERIALS 73 11a. EQUIPMENTS 73 11b. SHEET METAL WORK 83 11c. PIPES AND VALVES 93 11d. INSULATION WORK 99 11e. CONTROLS & INSTRUMENTATION 103 11f. MEASUREMENTS 104 12. DRAWING LIST 105 13.EQUIPMENT SCHEDULE 106 14.APPROVED MAKES 116 15.BILL OF QUANTITIES 118



2. SPECIAL CONDITIONS:

1. Tenderer is expected to visit the site before submission of the quotations. He must go through all the drawings and documents and fully acquaint himself with various conditions. No claim at a later date on account of lack knowledge of the site and working conditions will be entertained.

2. Owners/Project Manager/Architects/Consultants reserve the right to call upon any bidder to furnish

explanations regarding the calculations and clarifications on any details. They have the right to visit the office of the bidder and the various works carried out by the bidder and all reasonable assistance in this regard shall be afforded by the tenderer.

3. Prices should be for an indivisible works contract basis and rates quoted shall include all royalties,

taxes, octroi, entry tax and any other taxes leviable by the Government or local statutory bodies, in effect, and the rates shall be all inclusive and no claim whatsoever will be entertained in this respect. However customs and excise duty shall not be included in the prices.

4. A bill of quantities accompany the tender documents. It shall be understood that the quantities in the

schedule are only approximate and are liable to alterations at the discretion of the Owners/Project Manager/Architects/Consultants.

5. The supplier shall carry out the work under the direction and supervision of the Owners/Project

Manager/Architects/Consultants or their representative at the site who shall guide the Project Manager from time to time. The supplier shall intimate the names of his Engineers who would be supervising the construction in line with the requirements as specified in the tender and would be responsible for taking the instructions and carrying out the work.

6. The tenderer is responsible for the due and proper execution of all the works, terms and conditions

stipulated under this contract. He must examine the designs and satisfy himself of their feasibility. The responsibility of maintaining the conditions will rest with the supplier.

7. The Owners/Project Manager/Architects/Consultants or their representative at site shall have access

to the workshop of the successful supplier so as to assure themselves of the quality of material and workmanship.

8. The Owners/Project Manager/Architects/Consultants decision with regard to the quality of the

material and workmanship will be final and binding and any material rejected and not complying with the specifications shall be immediately removed from the site by the Supplier.

9. The tenderer shall include in his rates all material, labour, tools, plant and equipment and transport

which may be required in preparation and entire execution and full completion of the work.

10. In interpreting the specifications the following order of decreasing importance shall apply: 1) Schedule of quantities 2) Particular specifications & Special Conditions 3) Drawings 4) General specifications

In case of discrepancy between the bill of quantities, the specifications and/or the drawings, the Owners/Project Manager/Architects/Consultants shall be the deciding authority as to which shall prevail and their decision shall be final and conclusive.



11. The supplier must take necessary and effective measures and caution to prevent death and injuries to his labourers or to any third party. He is solely responsible for the consequences arising out of deaths or injuries or robbery or any other losses of any sort caused through his carelessness or that of agents, representatives or his labourers. The supplier is bound to pay all compensations including workmen's compensation, ESI, PF, claims etc., in every case for the harm that befalls the owner from the demands, claims and expenses which are caused by his execution of the contract. The successful supplier shall take out Supplier’s All Risk (CAR) Insurance policy jointly in the name of the owner and the air-conditioning Supplier and the original policy shall be deposited with the employers. The supplier shall cover in the policy against loss or damage due to any causes such as fire, tempest, floods, earthquake, riots, civil war, and insurrection and against damage by aircraft.

12. Any item which is not covered in the Schedule of Rates, but required to be carried out on site, shall be paid as per the actual cost of materials, labour and tools and plant, plus 15% towards overhead and profit. The rates noted in the schedule of rates will apply for the entire project.

13. The supplier shall guarantee that all equipments shall be free from defect due to defective materials and bad workmanship and that the equipment shall operate satisfactorily and the performance and efficiencies of the equipment shall not be less than the guaranteed values. The guarantee shall be valid for a period of 18 months after taking over and any parts found defective shall be replaced free of cost by the supplier. This period shall be known as defects liability period and shall be reckoned from the date the consultants certify the plant taking over as laid down in the tender conditions. The services of the air-conditioning supplier's personnel if requested during this period for such work shall be made available free of any cost. If defects are not remedied within a month of their occurrence, Owners may proceed to do as to the supplier's expenses, to be mutually agreed upon, without prejudice to any other rights.

1.1 DRAWINGS

14. The drawings furnished to the tenderer shall be interpreted by the use of given dimension and

nomenclature only; they shall not be scaled under any circumstances. Drawings to a large scale have precedence over those to a smaller scale. These drawings are general in nature and cannot be regarded as working drawings.

15. The equipment offered shall be accommodated within the space provided. If additional space is

required for the equipment offered by the tenderers, they shall bring out this point clearly in the tender itself. They shall note that claims for additional space at a later stage will not be entertained.

16. Space allocated for major air-conditioning equipment shall be taken into consideration before

ordering the equipment and they shall fit into the space provided with required clearances all round as per relevant regulations.

17. The drawings attached to these specifications are general in nature and cannot be regarded as

working drawings. The supplier shall prepare his own detailed working drawings and get them approved by Owners/Consultant before execution. Prior to submission for approval, the supplier shall be responsible for thoroughly checking all drawings to ensure that they comply with the intent and the requirements of the contract specifications and that they fit in with the overall building layout.

18. After installation is completed, 6 sets of "As built drawings" shall be prepared in full incorporating all

the changes and submitted to Owners/ Consultants along with 2 sets of soft copies on CDs within 1 month of the date of completion of installation.



1.2 LIST OF SIMILAR INSTALLATIONS & CAPABILITIES

19. The tenderer shall bring out specifically in the tender about his set up available in Bangalore for

execution of the job. He shall bring out the list of installations of similar jobs carried out. He shall also identify the Engineer who will be assigned for the execution of the job. The Engineers proposed by the supplier has to be formally accepted by the Owners/Project Manager/Architects/Consultants.

1.3 WORKMANSHIP

20. Specific emphasis is made as far as the quality of the workmanship is concerned. The successful

supplier has to co-ordinate properly with the Owners / consultants for ensuring the best workmanship. In case the quality of the work of the supplier is not acceptable to the Owners/Project Manager/Architects/Consultants the same shall be redone to the utmost satisfaction of the Owners / Consultants, failing which Consultants have the liberty to get the job executed on his own/or through other agencies and the supplier will be debited accordingly.

ACCEPTANCE OF EQUIPMENTS & MATERIALS

21. The major equipments proposed by the tenderer should have proved its performance atleast for a

period of one year satisfactorily elsewhere. The Owners/ Consultants has the liberty to acquire more data to ascertain the performance of the equipment for which the supplier has to render reasonable assistance. The decision of accepting or rejecting the equipments/materials will rest with the Project Manager/Owners/Project Manager/Architects/Consultants.

22. In case the tenderer is proposing alternate make of equipments and materials, he should bring out

the salient features and advantages of such items over the proposed make of equipments / materials. The decision of the Owners/Consultant in this regard is final and binding.

1.4 TESTING

23. After manufacture of the equipment, all the necessary routine tests shall be carried out as per the

relevant standards as listed in the Particular specifications. Routine and type tests for the various items of equipments shall be performed at the supplier's/manufacturer's works and test certificates shall be furnished. The Owners/consultant may depute their authorised representatives to be present during these tests if they desire to do so. The supplier shall provide all test equipments, labour and other service required for these tests free of cost.

24. On completion of the installation the supplier shall conduct under the direction of Owners/Project

Manager/Architects/Consultants and in the presence of the Owners and Consultant or their representatives perform tests on the plant as per the "Testing Procedures" in the Particular specifications. In the event full load due to appliances/product load as specified in the design data is not available and/or if the date of test does not coincide with peak summer or monsoon or winter conditions as the case may be, the supplier shall nevertheless conduct tests in the prevailing conditions both shall also repeat them as and when full load due to appliances materialises and during the peak seasons during the Defect Liability period. During such tests the plant shall be kept running continuously for a period of 48 hours. In case the performance does not meet the full intent of the specifications and further tests are considered necessary, the supplier shall bear all expenses thereof.



1.5 OPERATING INSTRUCTIONS & TRAINING

25. The supplier shall furnish a neatly typed set of operating instructions securely framed. These

instructions shall include information and guidance on operating pressures, temperatures, air quantities etc. The supplier shall submit 2 copies of operating and maintenance manuals. Such manuals shall include the equipment catalogues, technical details as per the formats in the tender, wiring diagrams, list of spare parts, part numbers and other relevant information.

26. The supplier shall train the Owner's operating and maintenance staff in the operation, repairs and

maintenance procedures during installation and maintenance period. Routine operation of the plant for a period of 30 days after handing over the plant shall be done by the Supplier along with the Owner's operating staff. Supplier has to impart training during planning, installation, testing and commissioning of the plant also.

1.6 STANDARDS

27. Wherever reference has been made to various standards in the particular specifications, the latest

version of the same at the time of tendering shall be applicable.

1.7 WORKS TO BE DONE BY THE TENDERER

28. The tenderer shall include the following works along with the other works mentioned in the tender:

a) All foundation bolts, vibration isolation pads, etc. for the equipment.

b) Any other works connected with air-conditioning which is deemed to have been included in the scope of this contract for ensuring satisfactory performance of the plant.

1.8 WORKS CARRIED OUT BY OTHER AGENCIES

a) Electrical Panels, cabling and earthing.

b) Civil works such as construction of AHU rooms, foundation for equipments, making openings for entry of pipes, ducts etc. However, detailed drawings shall be furnished by the supplier as required at stipulated time.

1.9 POST WARRANTY MAINTENANCE

29. Tenderers shall quote separately for post warranty maintenance of the air-conditioning system on

comprehensive basis inclusive of materials and labour. They shall also quote alternatively only on labor basis incase the spares are provided by Project Manager. They shall indicate the list of spares to be arranged by Project Manager in this regard.

1.10 IMPORTED EQUIPMENTS

30. Tenderer are required to note that forms regarding concessional/ nil excise/customs duty will be

provided by the owners. As such the tenderers are required not to include the excise duty/customs duty in their offer. However they shall indicate separately the quantum of excise duty/customs duty applicable. Tenderers who are offering imported equipment’s are also required to exclude the customs duty in their quotation, but shall indicate the quantum of customs duty applicable and the exchange rate of the currency considered in their offer. The tenderers are required to include along with the imported equipment’s, their rates for clearing the consignment till site including freight,



insurance, installation, testing and commissioning charges in Indian Rupees. No L.C will be opened by Owners and only 100% wire transfer on receipt of materials at site is applicable.The successful supplier has to provide all assistance to the Owners and submit the required documents and clear the consignments on behalf of the Owners.

SUBMITTALS

31. The successful supplier shall prepare the technical submittals for approval before ordering the materials. It is likely that such submittals may change the makes of certain equipments/items eventhough the same was proposed by the supplier during the tender stage, when such items do not comply fully with the specifications and requirements. No escalation in price is feasible under such circumstances. Samples and catalogues highlighting the equipments and materials shall accompany the submittals. Technical submittals shall bring out clearly the deviations to the tender specifications. The approval of the technical submittals rests with the Owners/Project Manager/Architects/Consultants.

CHILLER CAPACITY/POWER EVALUATION:

32. The capacity and power consumed by the chillers shall be tested in the field to ascertain whether the performance is as per the commitments given by the successful tenderer. Higher power consumption and lower capacity will lead to a one time cash penalty. The tolerance is +/- 5% for the power in KW and capacity in TR all considered individually. The penalty is Rs. 1,00,000/- for each TR, KW worked out separately falling outside the tolerance of +/- 5%. Tenderers not accepting this capacity and power consumption evaluation and penalty will be disqualified.

33. The chiller package capacity in TR shall be evaluated using the water flow measured through the balancing valve and the temperature difference across the chiller. The power consumed is measured using the voltage, current and power factor readings. Eventhough the ambient condition or condenser water entering temperature may not be at its peak as per the design conditions, the capacity assessment will be done for the conditions prevailing at that time. As such it is mandatory for the tenderers to furnish the part load performance of the chiller for various chilled water leaving, condenser water entering temperatures with corresponding power consumption. The evaluation will be done using the plant manager which is the part of the chiller package. The chillers shall be capable of logging all the readings by hooking it to a computer of the BAS. The compilation of the figures shall be done automatically for a period of 300 hours. The final decision of the Owners/Project Manager/Architects/Consultants with respect to the capacity and power consumption is final and binding on the suppliers. Manufacturers are advised to bring out clearly the step by step procedure for the capacity, power consumption evaluation.

QUALITY CHECK FORMS

34. The successful contractor shall submit to the consultants/owners on daily basis the quality control check forms duly filled in. Erection shall be considered complete only if stage-wise quality inspection is completed in all aspects. The contractor shall take the instructions from Consultants and Owners and strictly comply with the same.

PROJECT MANAGEMENT

35. The successful contractor shall monitor the project on daily basis using advanced project management techniques.



SITE FACILITIES/INFRASTRUCTURE

36. Successful contractor shall employ the committed accepted manpower at site all times. Non availability of the required manpower from the contractor’s part justifying the lesser manpower is not acceptable and will result in serious default of the conditions of the contract. The manpower committed shall not be changed or withdrawn without the prior approval of the Owners / Consultants. The site office shall have independent telephone/cell phone/pager for the Site Incharge. The site office shall have all the required documents such as contract, agreement and drawings. The contractor shall have the following personnel on full time basis at the site:

Project Manager – 1 no - Graduate in Engineering with minimum 8 years experience Project Engineers – 2 nos – Graduate in Engineering with minimum 4 years experience Site supervisors – 2 nos. – Diploma in Engineering with minimum 3 years experience.

3. BASIS OF DESIGN:

DESIGN CRITERIA AND SPECIAL REQUIREMENTS

Classification : Comfort Air-conditioning

Inside Design conditions : 24 Deg C 1 Deg C

Relative humidity : Not exceeding 60%

Outside design conditions :

WEATHER DRY BULB TEMP WET BULB TEMP

RELATIVE HUMIDITY %

SUMMER 103°F 82°F 41%

MONSOON 83°F 80°F 88%

WINTER 65°F 57°F 60%

Lighting Load : As per heatload summary

Equipment load : As per heatload summary

No. of Occupancy : As per heatload summary

Fresh air : As per ASHRAE 62.1.2010 standards



The noise level within the entire air-conditioned space shall be strictly below 45 dB

Measurements shall be made to check compliance of the ACMV with this requirement.

All chilled water piping shall be of two pipe direct return arrangement with Manual Flow Control Valves (gpm) for AHU, CSU and FCU cooling coil.

The following factors shall be considered in the selection of supply air diffusers for the air conditioned areas:

The throw of the jet at a terminal velocity of 0.25 m/s divided by the characteristic length (T0.25/L) should be equal to or up to 20% higher than listed in Table 2 of Chapter 31 of the 2001 ASHRAE Handbook-Fundamentals.

The plan area covered by each diffuser (A) should not exceed two times the mounting height (H)

squared i.e. A (2H)2

The contractor shall furnish samples of both supply air and return air diffusers for architect's approval.

Valves shall be provided on the inlet and outlet side to isolate each equipment such as chiller package, pumps, AHUs, FCUs etc. valves shall also be provided on individual risers serving the AHUs to isolate the risers.

Automatic air vents shall be provided for AHU as well as at all high points of the piping system. These may be augmented with manual air vents if required.

Drain valves shall be provided in the piping within each AHU room. Drain valves shall also be provided at all system low points such as at the bottom of the chilled water pipes.

It is the complete responsibility of the contractor to ensure that moisture condensation does not take place on any part of the ACMV system. To achieve this, the contractor shall provide insulation wherever needed even if the same is not specifically called for in this document.

Manual Balancing valve shall be provided on the chilled water outlet side for each AHU and FCU. Manual balancing valves shall also be provided at outlet pipe to each branch header or riser pipe as shown on the drawing.

The air distribution system for the Air Handling Units (AHUs) shall be constant Air Volume (CAV) system. The Volume of chilled water flowing through the AHU cooling coil shall be controlled by 2 way modulating valve. A Temperature sensor shall be provided in the return air path of AHU room to control the 2 way modulating valve. Ten percent of (Remote AHU).

Heat recovery system is used to recover the heat. The motor used in this heat recovery shall be having variable speed drive. Fresh air is modulated with Co2 sensor based on certain ppm which must be 500 more than the respective outdoor ppm.



MERV-13 filter is used for treating the air conditioned air.

Supply air ducts or return air ducts for air-conditioning shall not be routed above or through any toilet areas.

Fire-cum-smoke detector shall be provided in the return air path within each AHU room. On activation of the fire-cum-smoke detector the AHU shall be switched off. This shall be the scope of end user

All interlocks for safe operation of the equipment shall be provided by the contractor.

All the fans for mechanical ventilation system shall be of centrifugal cabinet type unless otherwise specified.

All air-conditioned areas shall be maintained at a positive pressure with respect to non air-conditioned spaces, including kitchen and toilet. Kitchen shall be maintained at a negative pressure to avoid the smell from disseminating into the shop space and same shall be scope of end user

ACCESS TO MACHINES AND EQUIPMENT

Clearance shall be provided around machines and equipment for removal of parts for repair and replacement. An average size person should have convenient access to any component requiring servicing.

PARTS HANDLING

Suitable means shall be provided for lifting and moving any equipment, component or part weighing over 25 kgs. Type of lifting and handling arrangement must be approved by the consulting ENGINEER / EMPLOYER.

SAFETY

All equipment shall be complete with approved safety devices wherever a potential hazard to personnel exists, and with provision for safe access of personnel to and around equipment for operation and maintenance functions. These items shall include not only those usually furnished with elements of machinery, but also the additional covers, guards, cross-covers, stairways, ladders, platforms, handrails etc., which are necessary for safe operation of the plant. The Contractor shall include for all safety items including but not limited to the following.

COUPLING GUARD

All drive couplings are to be covered with an approved guard fabricated from welded plate and structural steel.



BELT GUARDS

Belt guards shall be designed with approved provision to facilitate belt inspection, adjustment, replacement and general servicing.

ACCESS LADDERS AND PLATFORMS

Provision shall be made for access ladders and platforms with handrails as necessary to provide operator’s safe access to inspection holes, lubrication fittings, oil flow meters, valves, snap coupling for hose, and position from which readings must be taken, inspections made or material jams cleared.

NOISE LEVEL

All refrigeration and air conditioning equipment and materials (like motors, compressors, fans, pumps, ducts, grilles, acoustic lining etc.) shall be selected, designed and installed in such a manner that the inside noise is within acceptable limits.

The Contractor to note that the complete plant and installation when operated within the design criteria shall acoustically perform to the acceptable noise criteria ratings specified in this section.

The Contractor shall be responsible for any corrective action, which may be necessary either during construction or after completion of the works to achieve all design objectives.

RULES AND REGULATIONS

All works performed under this sub-contract shall be completed with all necessary equipment for its satisfactory operation control, maintenance and safety under all normal conditions of service and shall comply in all respects with the latest regulations, by-laws and the following accepted code of practice National building Code of India (NBC) Tariff Advisory Committee (TAC)

The entire air-conditioning and mechanical ventilation (ACMV) system shall comply with the following latest codes and standards, which shall be considered the minimum for design of mechanical systems.

American Society of Heating, Refrigeneration and Air-conditioning ENGINEERS, Inc., (ASHRAE) Guides, Data books, and Standards.

American Society of Mechanical ENGINEERS (ASME)

National Fire Protection Association (NFPA)

Sheet Metal and Air-conditioning Contractors’ National Association (SMACNA)

American National Standards Institute (ANSI)



American Society for Testing and Materials (ASTM)

Air-conditioning & Refrigeneration Institute (ARI)

Air Movement and Control Association Inc. (AMCA)

Bureau of Indian Standards (BIS)

National Electrical Code (NEC)

National Electrical Manufacturers Association (NEMA)

National Building Code of India (NBC)

Tariff Advisory Committee (TAC)

The contractor shall be responsible for obtaining the necessary permits from the relevant authorities for the operation of relevant Works or part thereof.

The Contractor shall at all times throughout the course of the contract comply with the requirements of the above said rules and regulations. Should there be contained in this Specification something inconsistent with the regulations of the above bodies, the Contractor shall draw such inconsistency to the Consulting ENGINEER and obtain a further instruction from him before proceeding with any related work. In case of any differences in the above standards, the more stringent standard shall apply. The decision of the consulting ENGINEERS in these matters shall be final and accepted by the contractor.

SITE CONDITIONS

The climatic conditions shall be as mentioned earlier. All equipment and materials supplied shall be designed specifically for use under such conditions.

The contractor shall submit calculations for internal, external and total static pressure for all AHU, supply and exhaust fans based on the equipment selected on site and on shop drawings prepared for consultant engineer’s approval. Contractor shall provide required fan motor based on this SP, calculation without any extra cost. Similar calculation shall be submitted for Chilled water and condensor water pump head as per site condition.

Wire mesh made of 14 Gauge Galvanised wire shall be provided behind each return air diffuser as well as at the return air duct / passage connected to the AHU room.

Access doors shall be provided for operation of all volume control dampers and fire dampers.

The GSS duct shall be of lock forming grade, Zinc coated conforming to IS 277 coating Gr 200 or better.

Painting of all equipments /accessories etc. shall be done by the CONTRACTOR as specified elsewhere in the specification.



4. SYSTEM DESCRIPTION:

AIR-CONDITIONING AND MECHANICAL VENTILATION (ACMV) SYSTEM

The design goal of the Air-conditioning system is to provide the designated Air conditioned space (refer enclosed drawings) within the proposed development with comfort cooling so as to maintain

inside conditions of Dry Bulb Temperature (DBT) of 24 Deg.C 1 Deg. C, and not more than 60% Relative Humidity. (For areas with Conventional Air conditioning system with Water Cooled Screw Chillers). Mechanical Ventilation shall be provided for all Toilets, as shown on air side riser diagram. It is mandatory for the CONTRACTOR to quote for a system with the following configuration of main equipment with the list of approved makes specified.

Water cooled screw chiller package

Number required : 2 working

Design Cooling Capacity : 125 TR

Design chilled water flow rate : 300 US GPM

Chilled water temperature in : 54.0 Deg F

Chilled water temperature out : 44.0 Deg F

Condenser water temperature in : 88.0 Deg F

Chilled water temperature out : 98.0 Deg F

Minimum COP : 5.2

Fouling Factor : 0.0001

Refer to equipment schedules for further details

Chilled Water Primary Pump

Number required : 2 working + 1 stand by

Minimum pump flow rate : 300 USGPM

Minimum total pump head : 35 Ft



Pump speed : Not more than 1500 RPM

Type of pump : Centrifugal pump End suction–back pullout type with long coupling

Refer to equipment schedule for further details

Chilled Water Secondary Pump





Type of pump : Centrifugal pump End suction back pullout

type with long coupling

Condenser Water Pump





Type of pump : Centrifugal pump End suction–back pullout

type with long coupling

Cooling Towers

Number required : 2 working



Flow Rate : 375 USGPM

Condenser Water Temp

in to Cooling Tower : 98.0 Deg F

Condenser Water Temp

Out from Cooling Tower : 88.0 Deg F

Ambient Wet bulb Temp : 83.0 Deg F

Maximum Approach : 5 Deg F

Air Handling Units Variable air volume unit (Double Skin Unit)

For AHU details refer Equipment Schedule & Drawing

Heat recovery unit

For Heat Recovery Unit details refer Equipment Schedule & Drawing

Central Chilled Water Plant for the Air-Conditioning System

The aim of the system for Central Air Cooled Chilled Water Air-Conditioning System is to provide

designated air-conditioning space in the proposed development with comfort cooling at 24 Deg.C 1 Deg. C for designated areas as indicated in the drawings

The system shall be integrated, installed and commissioned as a complete operational package to the complete satisfaction of the EMPLOYER and Consulting ENGINEER.

The Chilled water system is designed to provide the AHUs and FCUs with chilled water at 6.6 Deg C (44.0 F).

The chillers shall operate to meet the overall building load requirement throughout the day. Chiller operation shall be by a combination of chiller optimisation and sequencing.

Air Handling Units (AHU)

The cooled and dehumidified air supplied by AHUs and CSU’s/FCUs to the areas served by them shall

ensure the inside conditions of 24 Deg C 1 Deg C Dry Bulb Temperature (DBT) with RH not more than 60%. The cooled and dehumidified air (supply air) shall be conveyed to the air-conditioned areas through Galvanised Sheet Steel (GSS) ducting, and distributed to the air-conditioned areas through



supply air diffusers. The GSS ducting, diffusers/SA GRILLES, AHU’s and the associated control system shall be designed, erected, and commissioned by the contractor to ensure that the air-conditioned space is maintained at the temperature and humidity levels specified above. The return air from the air-conditioned areas is brought back to the AHU room using the false ceiling void (space available between the false ceiling and roof) by means of return air diffusers or slits. Fire dampers and volume control dampers shall be provided at all necessary locations. Volume control dampers shall be provided at all branch and sub branch ducts from individual main and sub main ducts whether shown on drawing or not to facilitate proper air balancing. The fresh air for Various AHU’s located in the individual floors is served by fresh air fans located at the terrace.

Volume Control Dampers and Fire Dampers shall be provided on duct risers as shown on air side riser diagram. Fire dampers of proper rating shall be provided whenever AC duct penetrates a fire wall irrespective of whether shown on drawing or not.

NOTE: Internal air distribution shall be scope end user and is excluded from this tender scope work.

Fan coil units

The fan coil units shall serve bathy metry. The fan coil unit shall be supplied with Solenoid valves and return air temperature sensor and temperature setting units. The fan coil shall also be supplied with three speed motors.

Building Management System

The chiller internal parameters shall be provided to the BMS system thru industry standard BACnet / Modbus RTU protocol.

The thermo wells for immersion temperature sensors shall be supplied by HVAC vendor. These shall be installed by HVAC contractor.

One number flow meter for measuring total flow will be supplied by HVAC vendor. This shall be installed in the chilled water supply header by HVAC vendor. Necessary flanges, couplings shall be provided by BMS vendor.

Two way modulating motorized valves for all air handling units shall be supplied by HVAC vendor. These shall be installed by HVAC contractor. Necessary flanges, couplings shall be provided by HVAC contractor.

BMS Contractor shall also provide a return chilled water temperature sensor in return main line to stop and start a chiller and pump as the building load varies.

The HVAC contractor shall co-ordinate with BMS contractor for installation of differential pressure switch for AHU filter status, monitoring and AHU on/off status monitoring.



Mechanical Ventilation System

1) Toilet ventilation system.

2) Fresh air for Air Handling units

Toilet Ventilation System

Centralised toilet ventilation system for toilets located in each core shall be provided. The toilets from Ground & First, Second, shall be ventilated by installing a 100% capacity fan located at the terrace level or by installing duct in line fans at the same level. The air inflow into the toilets shall be through adequately sized door grilles. The system consisting of centrifugal fans, GSS ducting, Volume Control Dampers (VCDs), Grilles and diffusers, electrical and controls shall be erected by the Contractor. The volume control dampers (VCDs) shall be located such that they are easily accessible for maintenance. Refer Air side riser diagram drawing for further details. The fan motor shall be connected with fire panel to trip in case of fire.

Fresh air for Air Handling units

Heat recovery unit is used for fresh air supply.

Kitchen ventilation system:

Exhaust will be driven through forced ventilation system, exhaust fan located at terrace.

Freash air supplied from Fresh air fan located at terrace.



5. GENERAL INFORMATION

The Special / Particular Instruction and Conditions of Contract as described in this document are intended to amplify the General conditions of Contract and shall be read in conjunction with specifications of work, drawings and all other documents forming part of this Contract wherever the context so requires. The following clauses shall be considered as an extension and not in limitation of obligation of the Contractor.

All expenses incurred by the CONTRACTOR in connection with obtaining information for submitting this tender including his visits to the site or efforts in compiling the tender shall be borne by the CONTRACTOR and no claims for reimbursement shall be entertained.

Notwithstanding the sub-division of the documents into separate sections and volumes every part of each shall be deemed to be supplementary to and complementary of every other part and shall be read with and into the CONTRACT.

Wherever it is mentioned in the specification, that the CONTRACTOR shall perform certain work or provide certain facilities, it is understood that the CONTRACTOR shall do so at his own cost.

1.2 OBLIGATION OF CONTRACTOR

The obligation of Contractor in fulfilment of ACMV works are stated below:

Procurement, fabrication and supply

Inspection and testing

Expediting and co-ordinating with other agencies

Scheduling and Monitoring

Training the Client’s representative in the Operation & Maintenance of the Plant

Erection, checking and testing

Commissioning

Carrying out performance tests to meet the specification requirement and to the full satisfaction of EMPLOYER

Providing Guarantee

Maintenance during Guarantee/Defects Liability period

Final documentation

Checking up the equipment and other materials to ensure that the same are as per the specifications laid down in description of work and drawings and also to make sure that they are in proper condition to be taken up for erection.

Drawing – up a detailed time schedule and to organise the erection work in conformity with the time schedule.



Arranging for the procurement and ensuring availability at the site at the required time of all the erection tools, necessary tackle, required for the erection work such as cranes, air compressor, welding sets, oxy-acetylene cutters, electric and pneumatic drills, steel wedges for levelling and grouting, scaffolding gay wire testing and cleaning equipment and all other construction equipment necessary for proper erection.

Arranging for procurement and ensuring availability at site at the time of all consumable construct materials for erection work such as welding electrodes, oxygen, acetylene and other welding gases, greases, petrol, cotton waste and all temporary fastening such as tack bolts clips, cleats and other materials, chemicals for cleaning and such other materials as may be needed to execute the handling and erection works.

Engaging and allotting an adequate number of engineers, erectors of all the required categories (Supervisory, skilled and unskilled labour) for carrying out different items at different stages of the erection work.

Assembling and installing of all items of machinery / equipment at their proper places at the plant site. The erection work will cover necessary operations such as, handling, sorting, stacking, unpacking, cleaning, assembling, bottling welding riveting, erecting, site fabrication, instrument cable laying and jointing, earthing, erecting, site fabrication, instrument cable laying and jointing, earthing, treatment for underground pipe protection, painting, thermal insulation and manual / mechanical / chemical cleaning, testing and other operations, provision of inserts, embedded plates in walls / roof / floor for erection of ducting, piping etc. Installation of all instruments – measuring and controlling of the plant. All control wiring also forms part of erection work.

Where different components of equipment are interconnected to form a complete system, their characteristics of performance and capacities shall be matched in order to ensure efficient, economical, safe and sound operation of the complete system.

Checking up of each individual items of plant equipment and also each pipe line, to ensure that the erection of these items has been properly carried out in conformity with the technical specification.

After all the installation and assembly work is completed the entire plant assembly including the pipe lines shall be checked up, by proper tests applicable to ensure that individual items of equipment, including pipe line have been properly installed.

Machines like compressors, pumps shall be checked up by actual working to satisfy that their alignment has been properly made and there are no mechanical faults.

Pipe lines shall be checked up by hydraulic tests to make sure that all valves, flanges etc., have been properly fitted up to that there are no leakages or wrong connection of interconnecting valves, pipes etc. Similarly all duct work shall be tested to ensure that air leakages rates are within the limits prescribed in the specification.

Instruments shall be checked up individually to make sure that they are in proper working order. The testing shall be in accordance with INDIAN STANDARDS or accepted International Standards. All instruments used for testing and measurements shall be calibrated instruments acceptable to National level standards.



The performance of the aforesaid services should confirm strictly to the ENGINEER'S technical specification, which forms an integral part of ‘THIS CONTRACT’.

It is only after the entire plant assembly has been thoroughly checked up on the lines indicated above and found satisfactory that erection work shall deemed to be completed and the plant considered READY FOR COMMISSIONING.

The Contractor shall also provide in his cost, framed duct layouts for the public areas to be mounted centrally for the convenience of the fire protection staff.

Plant and equipment details shall also be prominently displayed in engraved plastic name plates.

1.3 QUALITY ASSURANCE REQUIREMENTS

General

Quality Assurance (QA) requirements form an integral part of the contract and all contractors are required to comply.

Scope

The scope of QA requirements is as follows:

a) Preparation of a Quality Assurance Plan by the Contractor, which is referred to as “CONTRACTOR’S QUALITY PLAN” or CQP.

b) Performance of:

- Quality Assurance (QA) and - Quality Control (QC) activities at site

c) Documentation of the above

1.4 TENDER DRAWINGS

The Drawings issued with this Specification are for guidance of the CONTRACTOR and show the approximate positions of all items of equipment, etc. The actual and final position of all items of equipment shall be determined at site and approved by the Consulting ENGINEER. CONTRACTOR is to ensure that their proposal will meet with all the current rules and regulations of the relevant authorities in India.



1.5 SHOP DRAWINGS

a) All Shop Drawings shall be on Standard A1 size paper.

b) Before any work is put in hand, the Contractor shall submit Eight (8) sets of dimensioned Drawings showing all details of the equipment, piping, wiring, ductwork and materials etc. to be used, to the Consulting ENGINEER for review. The Contractor shall not commence final connection works until the Drawings are reviewed by the Consulting ENGINEER.

c) Review of Drawings by the Consulting ENGINEER does not exonerate the Contractor from any responsibility under the Contract terms and conditions.

d) The detailed Shop Drawings, prepared at a minimum scale of 1:100, plus necessary detail plans and cross sections at a scale of 1:50, showing complete detail of each item of specially fabricated equipment shall be submitted to the Consulting ENGINEER for his review before proceeding with fabrication. These Drawings shall be based upon the floor plans and the following specifications. These Drawings shall include accurately dimensioned details and locations of any special wall openings that are required where items of equipment extend through walls.

e) If early review is required, the Contractor shall advise the Consulting ENGINEER to this effect when submitting the drawings.

f) The Contractor shall forward eight (8) sets of the reviewed shop drawings to the Consulting engineer for distribution to interested parties.

1.6 WORKING DRAWINGS

The Contractor shall at all times maintain on site, in good order and condition, a complete set of all Drawings and Documents necessary for the proper execution and checking of the Works. These Drawings and Documents shall be made available on request to the Consulting ENGINEER or other authorised persons on site. Any amendment shall be indicated on the Drawing, dated and signed by the Authorised person in charge, with reasons stated if possible.

1.7 AS-INSTALLED DRAWINGS

a) The Contractor shall prepare two (2) sets of paper prints of the As-Installed Drawings, diagrams and schedules as in the opinion of the Consulting engineers, shows an accurate record of the work as installed by the Contractor and submit to the Consulting ENGINEER for approval. When approved, the Contractor shall submit three (3) sets of paper prints, one (1) set of sepia and one (1) CD ROM of the approved As-Installed Drawings for reference and record by the Consulting ENGINEER.

b) Such records shall include the preparation of properly dimensioned drawings showing the following:

i) General arrangement of all services



ii) Cable routes, types of fixings, layout, support and other particulars;

iii) The detailed layout of all equipment, plant chambers, etc;

iv) Conduit runs, pipe runs, duct work, etc.

v) A system diagram giving means of identification, circuit labelling and mounting level of equipment, etc., provided under the Sub-Contract;

vi) Schedules of all equipment installed.

c) All Drawings submitted by the Contractor shall have in the bottom right hand corner in addition to the Contractor’s name, title, scale, date and drawing number, the title of the project and subject of the drawings.

d) The retention sum or final payment will not be released until all such drawings and records have been received and approved by the Consulting ENGINEER.

e) One copy of the schematic drawing, isometric or layout drawing showing all equipment, controls, connections, etc. shall be framed and hung in the relevant Plant Room or location as directed by the Consulting ENGINEER.

1.8 TESTING AND COMMISSIONING

a) General

Testing shall mean providing that all of the systems efficiently meet the performance specified while in operation. The systems shall be tested in the presence of the Consulting ENGINEER who requires at least two full working days prior notice to enable him to attend.

The Contractor shall arrange for representatives of any of his own sub-Contractor to be in attendance.

It shall be the responsibility of the Contractor to supply all necessary testing equipment including Pitot tube and manometer, anemometer, newly calibrated pressure gauge, etc. Provision of all testing equipment and the appropriately skilled labour shall have been included in the Tender Price.

Should anyone of the tests reveal a fault, the Consulting ENGINEER will order that the fault be corrected and re-tested prior to acceptance. All fees connected with testing of equipment payable by Contractor to any of the relevant Government Authority shall be borne by the Contractor.

b) Commissioning Test

i) The complete installation or any part thereof shall be tested, both before and after being commissioned to check the performance in operation. All fees connected with testing of



equipment payable by the Contractor to any of the relevant Government Authority or expert from the Supplier shall have been included in the Tender Sum.

ii) The contractor shall be represented by a competent person approved by the Consulting ENGINEER during the whole of the period required for the tests.

iii) All materials and equipment supplied or erected under this Contract which fail the tests shall be replaced or rectified at once by the Contractor without cost to the EMPLOYER.

iv) The Contractor shall supply all necessary instruments, apparatus, connections, skilled and unskilled labour required for the tests to be conducted in the presence of the Consulting ENGINEERS, make accurate records of all tests carried out and furnish the Consulting ENGINEERS with four (4) COPIES OF THE Test Certificates and Schedule of Test Results in approved form.

v) The Contractor shall prepare a detailed and comprehensive check list for use during commissioning and testing. At least four (4) months prior to the start of commissioning, the Contractor shall commence gathering information required for this check list. Two (2) months prior to the start of commissioning, the Contractor shall submit to the Consulting ENGINEER his proposed check list for approval as follow:-

1) Ensure that all items that should be checked are included.

2) Produce a permanent record of the commissioning checks carried out.

iii) Accordingly, the check list must be built from information contained in the Specification, from Suppliers, SUB-Contractor’s and Contractor’s installation and commissioning similar equipment and systems.

iv) The detail of the check list must be such that it can be completed with a reading or a tick which means that every device listed, has been checked.

c) Reliability Tests After Commissioning

i) The installation shall be required to operate within the specified limits of its rating either continuously or intermittently as may be convenient without failure of any kind for a period of on (1) calendar month before the provisional taking over certificate is issued. Final taking over and acceptance certificate will be issued only after 72 hours performance test in peak summer, peak monsoon, and peak winter.

ii) Should any failure occur due to or arising from faulty design, materials or workmanship, but not otherwise sufficient to prevent the commercial use of the installation, the reliability test period of one (1) calendar month shall be recommenced after the Contractor has remedied the cause of failure to the satisfaction of the Consulting ENGINEER. The onus of proving that any failure is due to any other cause shall rest with the Contractor.

d) Testing and Adjustment During and After the Maintenance Period



In addition, the Contractor shall perform such test as may be directed at any time during the Maintenance period to satisfy the Consulting ENGINEER that the installation complies with the specified requirements.

1.9 Operating Manuals

The Contractor shall prepare three (3) copies of an operating manual, in a stiff-covered ring binder two (2) for the EMPLOYER and one (1) for the Consulting ENGINEER, describing the operation and maintenance of the whole system and including:-

a) Operating instruction for all equipment

b) SUB-Contractor’s pamphlets for all equipment including head / flow curves for all pumps with impeller size marked;

c) List of spares recommended;

d) Schedule of Recommended Maintenance.

Practical completion will be certified after the receipt of the above operating manual by the Consulting ENGINEER.

1.10 IDENTIFICATION AND LABELLING

Parts of the Works shall be properly labelled and identified. The contractor shall carry out the following work:-

i) Machine engraved trifoliate nameplates shall be provided to identify majority of equipment. Similar labels will indicate the function of ancillary equipment such as gauges, control valves, switches, indicating lights, push-buttons, relays and other indicating devices.

ii) Lettering shall be black on white background. Nameplates for major items of equipment shall be engraved in lettering of at least 6 mm. Labels identifying ancillary equipment shall be engraved in lettering of at least 3 mm.

iii) Identification lettering shall be applied to all pipe work and to all conduit at the following spacing:-

1) For all concealed runs in walls or ceiling spaces, every 5 metres but at least once.

2) For exposed runs, every 10 metres but at least once for each exposed section.

The identification shall consist of stencilled painted black lettering 25 mm high naming the services.



1.11PLANT OPERATION

The EMPLOYER shall have free and unrestricted use of the Contract Works or any part thereof which the Consulting ENGINEER may deem suitable without any interference whatsoever from the Contractor and such use by the EMPLOYER shall not relieve the Contractor of any liabilities or obligations in regard to the Contract.

1.12 TESTING

Routine and type for various items of equipment shall be performed at the SUB-Contractor’s works and test certificates shall be furnished. The EMPLOYER or his authorised representative reserves the right to be present during the tests.

After notification to the EMPLOYER that the installation has been completed, the Contractor shall make under the direction of EMPLOYER such tests and inspections as have been specified or as the EMPLOYER shall consider necessary to determine whether or not the full intent of the specifications have been fulfilled and whether further tests shall be considered necessary. The Contractor shall bear all the expenses thereof.

The Contractor shall operate, test and adjust all air-conditioning, ventilation and exhaust system units, fan motors, all air handling appliances provided in connection with the installation and shall make all necessary adjustments and corrections thereof including the adjustments of all regulating dampers. A carefully detailed record of the results of these adjustments shall be furnished to and be subject to the approval of the EMPLOYER.

1.13 Performance Test

A performance test by keeping the plant running for a period of 72 hrs. shall be carried out in peak summer, peak monsoon and peak winter periods. During the tests all necessary readings shall be taken hourly. From the readings so taken, the Contractor shall also establish the plant capacity. The computed results shall tally with the specified capacities furnished with Tender.

The contractor shall install in the system temperature probes, flow meters, pressure gauges etc., to verify the capacity of the various equipment.

All the test equipment instruments, labour, operating personnel, oil and refrigerant required for these tests shall be furnished by the Contractor at his own cost.

If the test do not show satisfactory result, the Contractor shall at his own cost, rectify / replace and defective installation or part thereof as directed by the EMPLOYER within two months. The decision of the EMPLOYER shall be final and binding in this respect. Only after all these tests are satisfactorily completed and the defects found during these are rectified, the plant will be finally accepted.



1.14 Testing Guarantee

All equipment and space conditions shall be tested after carrying out necessary adjustments and balancing to establish the equipment ratings and indoor space conditions. At least four sets of readings shall be taken daily for each item tested and submitted in the form shown separately. Instruments required for testing shall be furnished by the Contractor.

All equipment shall be guaranteed for the specified ratings with a tolerance of 0% on the minus (negative) side.

All equipments and the entire installation shall be guaranteed against defective materials and workmanship for a period of 12(twelve) months from the date the equipment and installation are handed over.

1.15 Reports

Provide 3 copies of the complete balancing and testing reports to the EMPLOYER / Consulting engineer. Report shall be neatly typed and bound suitable for a permanent record. Report forms shall contain complete test data and equipment data as specified.

1.16 Balanced System

The Fluid System Balancing Contractor shall leave the system operating in complete balance with water and air quantities as shown on drawings. Set stops on all balancing valves and lock all damper quadrants in proper position. Secure all automatic damper and valve linkages in proper positions to provide correct operating ranges. Proper damper positions shall be marked on ducts with permanent indication. Notify the EMPLOYER of any areas of marginal or unacceptable system performance.

1.17 Training

Upon commissioning and final handover of the installation, the Contractor shall submit (within 4 weeks) 3 copies of operating instructions, maintenance and service manuals, part lists and all final drawings and diagrams, indexed and bound together in hard cover ring binder.

The Contractor shall conduct a training programme for designated Employer’s personnel. These courses shall be carried out during normal office hours and not be less than 1 month’s duration. The date of commencement of training shall be mutually agreed upon and in any case shall be within two weeks of handover of installation.

The training programme shall cover all operating and maintenance aspects of the system, inclusive of detailed explanation and demonstration of each and every piece of equipment and an overview of the system network.



The training programme shall consist of both handouts and classroom training at the job site or at location agreed upon by the EMPLOYER.

All instruction manuals, tools, transportation, etc. association with the training programme shall be provided by the Contractor. Such cost shall be deemed to have been included in the CONTRACTOR programme.

1.18 Guarantee

The Contractor shall guarantee the inside conditions as stipulated elsewhere. In addition, the Contractor shall also guarantee that all equipment shall be free from any defect due to the defective materials and bad workmanship and that the equipment shall operate satisfactorily and the performance and efficiencies of the equipment shall be not less than the guarantee values.

The guarantee shall be valid for a period of 12 months after taking over and any parts found defective shall be replaced free of all costs by Contractor. The services of successful Contractor’s personnel if requisitioned by the EMPLOYER during this defects liability period for such work shall be made available free of any cost.

The Contractor shall without any extra cost carry out for a period of 12 (twelve) months after the installation is taken over, all routine and special maintenance of the plant and attends to the defects that may arise in the operations of the plant.

Maintenance will consist of monthly maintenance and necessary adjustment and lubrication of the equipment by the Contractor’s employee under competent direction and supervision. In addition to the monthly maintenance, special examination between regular intervals and emergency minor adjustment, call back services should be provided during the guarantee period.

Parts that become necessary due to normal wear and tear during the guarantee period will have to be replaced free of cost.

In case of any defect or malfunctions of the equipment during the period of maintenance, immediate attention must be ensured without claim to any extra amount, charges or compensation.

All the maintenance work will be performed during regular hours of regular working days. However the works in condenser coil and cleaning of cooling coils etc., should be carried out only during the holidays with prior permission from the EMPLOYER.

One month before the end of the defects liability period, the Contractor shall notify the EMPLOYER of the required inspections for all equipment and facilities including specific energy consumption.

1.19 Maintenance in Warranty Period



The CONTRACTOR shall furnish warranty for the entire system for a defect liability period (DLP) of twelve (12) months after the final official hand over date of the installation. This period shall include maintenance replacement of parts, regular periodic visit by qualified personnel of the CONTRACTOR and attending to emergency call at short notice.

1.20 Conclusion of 12 month warranty period

Just before the expiry of the warranty period of the Contract, the Contractor shall carry out a complete system operability test on all the systems or sub-systems as called for in the Contract.

The purpose of the test is to verify that the performance of all the systems of sub-systems in the Contract is in accordance to the specifications.

All tests shall be carried out in the presence of the EMPLOYER or his representative.

The warranty period is deemed to be over if the EMPLOYER or his representative is completely satisfied with the system performance during the test.

1.21 Annual Maintenance Contract

The CONTRACTOR shall quote separately for comprehensive and all inclusive (labour and material and everything) Annual Maintenance Contract for full three years period after the Defect Liability Period (DLP). The CONTRACTOR shall bear the full responsibility for all kinds of maintenance which includes periodic maintenance as well as attending to all breakdown and emergency calls at short notice whenever called. During this three year period the scope of annual maintenance contract includes repair and replacement of any or all parts as required. Besides, the replenishment of all consumables shall also to be included in the scope of annual maintenance contract.

The CONTRACTOR shall furnish the list of recommended spares along with quantity and unit price schedule to the EMPLOYER along with the bid. The EMPLOYER reserves the right the required spares during the tenure or on completion of annual maintenance contract at the quoted price which should be valid for the entire maintenance period i.e. three (3) years after DLP.

1.22 COMPENSATION FOR SHORTFALL IN CONTRACT RATINGS.

Ratings / Capacities Of The Plant

There shall be no credit to the CONTRACTOR if the output of the plant is higher than the rated capacity. There will be zero percent (0%) tolerance for the rated capacity on the negative sides.

During performance tests in case of any shortfall in the contracted system / equipment capacity, the Contractor will be given a chance to make adjustments after which the Performance test will be conducted again at the Contractors expense. In case the equipment does not meet the contract rating



the equipment will have to be replaced at the cost of the Contractor within a reasonable period of time as will be indicated by the EMPLOYER and as per Performance as Guaranteed in the Tender.

1.23 TAKING OVER CERTIFICATE

As soon as the Works have been completed in accordance with the Contract and have passed the tests on completion, the Consulting ENGINEER will issue a provisional certificate (hereinafter called the provisional Taking Over Certificate) in which he shall certify the date on which the Works have been successfully commissioned.

1.24 MOCKUPS AND SAMPLES

The Contractor shall construct mock-ups of typical installations of services and common items of equipment as and when directed by the Consulting engineer. Mock-ups shall be constructed to ensure proper installation and coordination of all services on site.

Upon approval, mock-up shall be used as the basis of installation work for similar areas.

Samples of components, fixtures, etc. shall where required, submitted to the consulting engineer for approval before commence of the installation work.

1.25 BRAND NAME / MAKE OF EQUIPMENT

For the main air-conditioning plant, CONTRACTORs are required to offer only the ‘Brand’ make / as indicated elsewhere in the specification of to ensure fair evaluation of proposal. It is to be noted by the contractor that materials / equipment, for which brand / make has not been specified, the contractor shall use only reputed makes. The contractor shall submit a list of such brands / makes to the consulting engineer along with his offer for approval.

1.26 SITE MANAGER & SITE ENGINEER

The site engineer posted at site shall have adequate experience for handling a job of this magnitude. The resume of the site engineer shall be submitted to the Consulting engineer for approval along with the offer.

1.27 CONSUMABLE MATERIALS DURING CONSTRUCTION, COMMISSIONING TESTING AND SUBSEQUENT WARRANTY PERIOD

i) Water is made available by the clients. It shall be sole responsibility of the contractor to inform the client in advance about the quantity and quality required for purpose of testing commissioning of the systems.



ii) It shall be sole responsibility of the contractor to ensure that power of adequate & the quality is available for purpose of testing commissioning of the systems and administrative purposes.

The Contractor shall supply at his own cost the following consumable materials as and when required.

a. All oils and greases required for lubrication of compressors, fan bearings, motors bearings, pivots and other moving parts.

b. All refrigerant required to replace refrigerant losses in the refrigerant systems.

c. All consumable, filter elements / rolls.

d. All Chemicals for the correct chemical treatment of the chilled water system.

e. All carbon brushes required to replace worn brushers in electric motors.

f. All electric contact points required to replace worn electric contact points in switchgears, motor starter gears, electronic control gears and electric relays.

g. All electric fuses required to replace blown fuses.

h. All cotton waste, soap detergent and other cleaning materials required for cleaning purpose.

The cost of these consumable materials shall be included in the contract Price.

After every inspection and service, the Contractor shall submit a written report to the EMPLOYER with a carbon copy extended to the Architect.

1.28 PAINTING & LABELLING

General

Unless otherwise specified, all exposed surfaces including trunkings and cable tray, duct work, equipment, etc., shall be thoroughly cleaned and painted.

All ferrous metal surfaces without protective finishes shall be painted, except surfaces of moving parts which shall be thoroughly oiled and greased as required.



Non-ferrous surfaces may be left unpainted unless called for in this specification or required by the Architect for the purposes of colour coding and identification. Aluminium grilles and diffusers shall be powder coated with colour approved by the architects.

All bare surfaces requiring painting shall first be given a priming coat followed by an undercoat and two finishing coats.

Colour Scheme

All services shall be painted in accordance with following colour scheme:-

Service Colour

Chilled water flow Blue

Chilled water return Light Blue

Drain Black

Cold water make up Green

Chemical lines for water treatment Brown

Chillers, Pumps, Switchboard, Local Control Panels Jade Green

Hangers, Supports, Framework, Valves, Fittings, etc. To match surrounding

Registers, Diffusers and Grilles To match surrounding

Surface behind Registers, Diffusers and Grilles Matt Black

Air Handling Unit Fan Coils and Fans Jade Green

Ductwork To match surrounding

Sign Writing

All major items of equipment shall be identified with approved names and / or numbers of suitable size in proportion to the size of the respective items.

Pipelines shall be painted in contrasting colour directional arrows adjacent connections, valves and branches and at intervals of not more than 2.5 mm. These arrows shall be 75 mm long on pipes up to 50 mm diameter and 150 mm long on pipes over 50 mm diameter.



All stop valves and control valves the function of which are not obvious shall be provided with a non-corroding metal or laminated plastic identification tag. The tag shall indicate the service, and the area or items which the valve serves.

1.29 CONTROL OF NOISE & VIBRATION

This section of the specification coves the supply, delivery, installation and testing of Noise and Vibration Control equipment to be used in the isolation of the various Mechanical equipment as called for in this specification.

It is the intent of this specification that noise levels due to mechanical equipment and related services will be controlled to the design objectives stated herein, in all occupied areas. The requirements specified are considered to be the minimum precautions necessary to achieve these objectives. The entire installation shall operate without objectionable noise and vibration as determined by the Architect.

The contractor shall examine all drawings and specifications including architectural and structural sets of working documents, before commencing any work on the project and shall immediately bring to the Architect’s attention any characteristics or properties of the building or any other factors which, in his opinion, would jeopardize or nullify the attainment of the design objectives.

The contractor shall guarantee that the complete plant and installation when operated within the design criteria shall acoustically perform to the noise criteria ratings specified.

The screw chiller package shall be mounted on steel springs in series with neoprene. Limit stops are required to limit travel when machine is drained. A steel base frame suitable for point loading of the Chillers shall be provided as approved by the Architect.

Pumps

(a) All pumps shall be selected for the highest efficiency consistent with the specified duty and pump impeller diameter shall not exceed 0.9 of the maximum impeller diameter capability of the pump housing to reduce the possibility of tonal effects.

(b) Pump impellers, shafts, and drive couplings shall be statically and dynamically balanced to the best commercial standards, and vibration amplitudes shall not exceed 0.02 mm peak to peak displacement at 1500 rpm when measured on the machine structure, with the pumps / motors mounted on the inertia blocks specified.

(c) The pump and motor-assembly shall be mounted on a concrete filled inertia block and completely isolated. Pump inertia block shall size to support the weight of elbows, valves and other fittings without creating undue stress on the pump assembly.

(d) Pump speeds shall not exceed 1500 rpm.



Air Handling Units, Ceiling Suspended & Ventilation Fans

All air handling units shall be mounted on steel spring isolators in series with neoprene pads.

All fans shall have complete impeller assemblies including drive components, statically both dynamically balanced to the following maximum allowable vibration criteria.

Equipment Maximum Allowable Vibration Peak to Peak Displacements as measured on equipment (mm)

Ventilation and Air Handling Units (Centrifugal fans)

Under 600 rpm 0.1

600 – 1000 rpm 0.075

1000 – 2000 rpm 0.05

Over 2000 rpm (impeller speed) 0.025

As part of this Contract, the Contractor shall supply the Sound Power Levels (re 10-12 Watt) of all fans and AHUs offered.

All connections between Air Handling Units / Fans and ductwork shall be properly aligned and executed using flexible material (rubberised canvas, or lead impregnated PVC)

All air-handling units shall be fitted with sound attenuators on the supply main ducts downstram close of main plenum close to the AHU room. The performance values (dynamic insertion losses, air quantities, frictional losses) are given as a guide only and the precise requirements will depend on final fan selections, duct layouts, design criteria for various areas. In cases where fan and AHU sound power levels exceed the values lifted in the schedule, additional attenuation may be required.

The contractor shall submit, with the proposed shop drawings, his Sound Attenuator selections based on these factors. Where additional fan attenuation is required on fans (to meet the noise criteria), this shall be provided by the contractor at no additional cost to the EMPLOYER.

Acoustic performance of the sound attenuators (net insertion loss) shall meet or exceed the values listed below.

Octave Band Centre Frequency (Hz)



Insertion loss 63 125 250 500 1K 2K 4K 8K

dB 6 10 18 30 42 34 23 14

Contractor shall submit a test certificate for acoustic and aerodynamic performance of the attenuators. The insertion loss and self generated noise for each octave band along with pressure drop shall be stated.

Fan Coil Units

(a) All fan coil units shall be suspended on anti vibration spring hangers.

(b) All piping serving fan coil units shall be isolated by rubber sleeves where suspended or attached to the structure. There shall be no solid connection between fan coil units and the structure. Discharge ducts shall be fitted with flexible connections.

Miscellaneous Equipment

All equipment located in plant rooms above or under occupied areas and capable of producing noise or vibration shall be isolated from the structure. Acoustical isolation by neoprene/fibreglass, cork pads is required for tanks, electrical switchboards, etc.

Testing on Completion

Sound level and vibration measurement shall be made by a testing authority approved by the consulting ENGINEER. Should the tests show that noise or vibration is in excess of those specified, or that balancing of equipment is incorrect, or that vibration transmission through mountings, hangers, etc. is excessive the contractor shall correct the installation at his own cost? Further tests shall then be carried out at the contractor’s cost to show that the noise and vibration levels have been reduced to the limits specified.

Sound level readings shall be taken at times when the building is unoccupied or when activity in surrounding areas and background noise levels in areas tested, are at a minimum and relatively free from sudden changes. Readings shall be taken with no other equipment operating and with all plant, capable of transmitting sound to the space tested in operation.

All apparatus used for sound and vibration measurements shall be approved by the consulting ENGINEER.

Noise levels shall be measured with Sound Level meter fitted with an octave band analyser and conforming to International standards. Overall sound levels shall be read on ‘A’ scale of the meter and octave band sound levels on an octave band analyser connected to the meter with its C-scale network in use.



6. HEAT LOAD SUMMARY



7. TECHNICAL DATA

TECHNICAL DATA SHEET CUM SUBMITTAL

FOLLOWING TECHNICAL DATA SHALL BE DULY

FILLED AND SUBMITTED ALONG WITH THE

TENDER. TENDERS WITH INCOMPLETE DATA ARE

LIABLE FOR REJECTION. FURNISH DATA

STRICTLY AS PER THE UNITS CALLED FOR.

WATER COOLED TYPE CHILLER PACKAGE - SCREW

TYPE 125 TR

Make of machine

Model No

Origin of machine

Nominal Capacity - TR

Overall dimensions (L x W x H) mm

Overall weight - Kg

Number of machines

Capacity at 31.11 deg. C condenser water

entering

and 6.66 deg. C chilled water leaving - TR

Noise level at 1 m along perimeter dBA

@ 100 % load

@75 % load

@50 % load

@25% load

Material & thickness of casing

Clearance required between machines - mm

Clearance required from wall - mm

COMPRESSOR

Manufacturer and Origin

Model



Refrigerant

No. of compressors per machine

Whether vertical / horizontal type

Operating speed - RPM

Type - hermetic/semi-hermetic

Displacement at maximum speed - CMH

Whether variable speed drive included Yes/No

Miniumum percentage load the compressor

can be operated without surge (%)

% Harmonics

Whether required harmonics filters included Yes/No

Suction temperature - deg. C

Discharge temperature - deg. C

Capacity at 31.11 deg. C condenser water

entering

and 6.66 deg. C chilled water leaving - TR

IKW at above conditions

IKW/TR

Type of capacity control

TR, KW AND IKW/TR at 31.11 deg. C condenser

TR - KW -

1KW/TR

water entering and 6.66 deg. C chilled water

leaving temperature

25%

50%

75%

100%

IKW with ARI relief

25%

50%

75%

100%



Performance chart enclosed Yes/No

Type of lubrication

MOTOR

Make

Type of motor

Motor speed

Motor KW

Range of working voltage & frequency

Class of protection

Class of Insulation

Starting current of first compressor - Amps

Starting current of the last compressor together

with other compressors at full load - Amps

Full load current (Amps)

Type of starter

WATER COOLED CONDENSER

Type of condenser

Shell diameter - mm

Shell length - mm

Material of shell

Tube diameter - mm

No. of tubes

Material of tubes

No. of fins/cm incase of finned

Fouling factor - BT units



Total surface area - sq.mt

Refrigerant side

Water side

Pressure drop - KSC

Water velocity - mps

Water flow - LPM

Entering water temperature - deg. C

Leaving water temperature - deg. C

Condensing temperature - deg. C

Degree of subcooling - deg. C

Operating refrigerant charge - KG

Test pressure - KSC

No. of passes

Type of water connection

CHILLER

Type of chiller DX/Flooded

Shell diameter - mm

Overall length - mm

No. of tubes

Diameter of tube - mm

Material of tube

Nature of tube

Material of shell

Thickness of shell - mm

Water side surface area - sq.mt

Refrigerant side surface area - sq.mt



Water flow rate - LPM


Leaving water temperature -deg. C

Pressure drop - m

Fouling factor (BT units)

No. of circuits

Material and thickness of insulation (mm)

Type of water connection

Whether bellows included for condenser and

chilled water lines Yes/No

Whether spring mounts for chiller included Yes/No

Total KW/TR for chiller

Whether Plant Manager included Yes/No

Whether water flow switch included Yes/No

Whether incoming MCCB/ACB included Yes/No

No. of incoming cable terminations to the unit

Whether the plant Manager can read voltage,

current and % loading of each compressor,

chilled water entering and leaving and

condenser water entering temperature for

capacity

and power evaluation Yes/No

Whether required hardware & software is

included for hooking with Building automation Yes/No

Protocol applicable for builiding automation

Whether machine can be installed outdoor Yes/No

Whether the chiller includes all controls as

per specifications Yes/No

(Bring out deviations if any)



Minimum percentage of chiller load at which the

chiller can be run continuously - %

Acceptance to capacity/power penalty clause Yes/No

Hardness of water recommended for condenser

Please enclose performance charts for full load

and part load for capacity and power without

which the offer may be rejected

COOLING TOWER

Make of cooling tower

Model No

Nominal capacity - TR

No. of units offered - Nos.

No. of cell

Type of flow

Material of the tower

Material of the fill

Material of basin

Material of louver

Material of drift eliminator

Fire rating of cooling tower

Noise of cooling tower at 1m - dBA

Dimensions ( W x L x H) in mm

Tower weight in Kg

Operating weight in Kg

Ambient wet bulb temperature - deg. C

Water entering temperature - deg. C



Water leaving temperature - deg. C

Water flow - lpm

Air flow through each cell - CMH

Fan diameter

No. of fan blades

Type of fan

Speed of fan

Type of drive

Whether the fan is statically & dynamically

balanced

Type of motor

KW of motor

Whether the motor is of dual speed Yes/No

Operating voltage - Volts

Type of starter and terminal arrangement

(enclose sketch)

Whether vibration switch included Yes/No

Whether cushy foot moutings included Yes/No

Whether all fasteners are of stainless steel Yes/No

Drift loss - %

Quality of water suggested

WATER PUMPSETS

PRIMARY

SECOND

ARY

CONDENS

ER

CHILLED WATER

CHILLED

WATER WATER

Make

Model



Type

Water flow - LPM

Head - m

Operating speed

Material of impeller

BKW

Efficiency

Type of motor

Motor KW

Dimension ( W x D x H) in mm

Weight of the pump including baseframe and

motor - Kg

Diameter of the suction port - mm

Diameter of the discharge port - mm

Whether mechanical seal provided Yes/No

Whether isolation bellows included Yes/ No

Whether inertia frame included as per specs. Yes/No.

Whether cushymounts/springs included Yes/No

Whether rubber bellows included Yes/No

(Please enclose performance curves of pumpsets)

VARIABLE FREQUENCY DRIVES FOR PUMPSETS CHILLED WATER

PUMPSETS

Make

Supply voltage and range

Supply Frequency and range

Starting torque - % for 1 minute



No. of programmable analog input/outputs

No. of programmable digital input/outputs

Whether RFI filters included Yes/No

Make of enclosure

Protection class

Whether all protections as per specs. Included Yes/No

Harmonics - %

Whether bypass starter included Yes/No

Make of pressure transducer

Type of pressure transducer

Range of pressure transducer

Make of temperature transducer

Type of temperture transducer

Range of temperature transducer

Whether the required hardware/software, wiring

between

transducer, VFD and BAS system for integration Yes/No

included

Protocol applicable for building automation

FLOOR MOUNTED AIR HANDLING UNITS

AHU TR/AIR QUANTITY IN CFM 17 TR/7000 CFM

14

TR/7000

CFM

12

TR/5000

CFM

Make and Origin

Model

Overall Dimensions - W x D x H - mm

Overall weight - Kg

Material and thickness of casing in mm:

Inner casing

Outer casing

Material of insulation

Thickness of insulation (mm)



Make of blower

Orign of blower

Type of fan (forward/backward)

No. of fan drums

Air flow - CMH

Total Static pressure - mm wg


Critical speed - RPM

Type of drive (Direct/belt)

BKW

Fan outlet velocity - MPS

Type of bearings

Whether statically and dynamically Yes/No

balanced ?

Noise level at 1m from fan (dBA)

Noise level at 1m from the filter side (dBA)

Whether inbuilt sound attenuator for AHU included Yes/No

Depth of sound attenuator - mm

Vibration level

Capacity of cooling coil - TR

Coil face area - sq.mt


No. of rows

Material of tube and fins


No. of fins/cm

Type of fins

ADP - deg. C

Entering air temperature DB & WB

Leaving air temperature DB & WB



Water flow - LPM

Water side Pressure drop - KSC

Type of pre filters

Size and number of pre filters

Media used

Face velocity across filter (MPS)

Arrestance & efficiency

Resistance when clean - mm

Method of cleaning

Make of motor

KW of motor

Type of motor

Speed of motor

Degree of motor protection

Starting current of motor - Amps

Full load current of motor - Amps

Class of insulation



Whether single/three phase

Whether provision for cable entry provided Yes/No

Whether commissioning filter included Yes/No

Whether marine lights included Yes/No

Whether door switch included Yes/No

Whether mesh for the fan section included Yes/No

CEILING SUSPENDED AIRHANDLING UNITS


10

TR/4000

CFM

7.5

TR/3000

CFM

Make and Origin

Model


Overall weight - Kg


Inner casing

Outer casing




No. of fan drums

Air flow - CMH





BKW


Type of bearings


balanced ?



Vibration level




No. of rows



No. of fins/cm

Type of fins

ADP - deg. C





Water flow - LPM




Type of pre filters


Media used




Method of cleaning

Make of motor

KW of motor

Type of motor

Speed of motor




Class of insulation







CEILING SUSPENDED AIRHANDLING UNITS


3

TR/1200

CFM

2.5

TR/1000

CFM

Make and Origin

Model


Overall weight - Kg


Inner casing

Outer casing




No. of fan drums

Air flow - CMH





BKW


Type of bearings


balanced ?





Vibration level




No. of rows



No. of fins/cm

Type of fins

ADP - deg. C





Water flow - LPM


Type of pre filters


Media used




Method of cleaning

Make of motor

KW of motor

Type of motor

Speed of motor




Class of insulation







CABINET FAN FOR EXHAUST AIR

AIR QUANTITY - CFM 3000 Cfm

2400

Cfm 1800 Cfm

Make

Air quantity (CMH)

Overall dimensions (mm) - W x D x H

Material and thickness of casing (mm)

Make of blower

Origin of blower

Type of fan

Fan static pressure (mm - WG)



Operating speed in RPM

Type of drive (direct/belt)


BKW

Motor make

Motor KW

Starting current - Amps

Full load current - Amps

Operating voltage (Volts)

Whether gravity louvers included Yes/No

Whether VFD included Yes/No Yes/No Yes/No

PROPELLER FAN

Make

Air quantity (CMH)

Diameter (mm)

Material and thickness of casing (mm)

Type of fan

Fan static pressure (mm - WG)

Operating speed in RPM

Type of drive


BKW

Motor make

Motor KW

Starting current - Amps

Full load current - Amps

Operating voltage (Volts)

Whether gravity louvers included Yes/NO

VARIABLE FREQUENCY DRIVES FOR AIRHANDLING

UNITS AND FAN

Make

Supply voltage and range

Supply frequency and range

Output voltage - % of supply voltage

Output frequency

Starting torque - % for 1 minute

Overload torque - %

Whether bypass starter included Yes/No

Whether FASD starter included for above 5.5 KW Yes/No

Whether incoming isolator included Yes/No

No. of programmable analog input/outputs

No. of programmable digital input/outputs

Whether RFI filters are included Yes/No

Whether compatible with BAS Yes/no

Frequency range - Hz

Make of enclosure

Protection class



Ambient temperature - deg. C

Whether all protection as per tender included Yes/no

(Bring out deviations if any)

Dimensions for different capacities - enclose

catalogue

Harmonics - %

Whether required hardware/Software for BAS

integration included Yes/No

BAS protocol

Whether duct pressure sensor and wiring

included Yes/No

Make of duct pressure sensor

Range (pascals)

DUCTING

Make of Galvanised sheets

Class

Whether the ducting system is as per specification Yes/No

GRILLES/DIFFUSERS

Make

Material of construction

Material of damper

Type of damper blades

OUTSIDE AIR/EXHAUST AIR LOUVERS

Make

Material

Whether mosquito net included Yes/No

Whether damper included Yes/No

SUPPLY/RETURN AIR DIFFUSERS

Make

Material

Whether perforated sheet included Yes/No

Type of damper

SOUND ATTENUATOR

Make of sound attenuator

Thickness of casing - mm


Spacing between louvers

Thickness of perforated sheet - mm

Material of perforated sheet

% of free area for perforated sheet

Insertion loss - dB

ALUMINIUM FLEXIBLE DUCT

Make



Thickness of insulation - mm


Whether worm drive clamp included Yes/No

PVC FLEXIBLE DUCT

Make

Thickness of the duct

Whether worm drive clamp included Yes/No

Whether the material is fire retardant Yes/No

VOLUME CONTROL DAMPERS

Make


Thickness of casing sheet

Type of blades

Material of gears

Material of bearings

FIRE DAMPERS

Make


Thickness of casing sheet - mm

Fire rating in hours

Whether the actuator has a spring to close

during fire eventhough there is no power Yes/No

Whether temperature transducer included Yes/No

Tempertature at which the damper will close deg.

C

Whether the damper can receive an

external fire signal Yes/No

Whether damper open/close identity switch

included Yes/No

Whether control panel and wiring between sensor

and actuator included Yes/No

PLENUMS

Make

Material of outside casing and finish

Thickness of outside casing

Material of perforated sheet inside casing

Thickness of perforated inside casing

Perforation diameter

% of free area of perforations


Thickness of insulation

Flame spread index of insulation

Density of insulation - Kg/Cum

INSULATION

Make of Fibre glass



Thermal conductivity

Density (kg/cum)

Make of expanded polystyrene


Density (kg/cum)

Whether EPS is of TF grade Yes/No

Make of synthetic foam


Density (kg/cum)

Flame spread index

Type of adhesitve used for synthetic foam

Whether cladding for synthetic foam insulation

is fire retardant Yes/No

Make of factory made supports

Make of vibration isolators

DUCT PRESSURE SENSOR

Make

Model

Pressure range - Pa

Type of mounting

Whether wiring between transducer and VFD Yes/No

included

DUCT TEMPERATURE SENSOR

Make

Model

Tempertaure range - deg. C

Type of mounting


included

CARBON-DI-OXIDE SENSOR

Make

Model


included

PIPES & VALVES

Make of pipes

Class of pipes

Make of butterfly valves

Make of check valve

Make of balancing valve

Whether balancing is done with electronic gadget

Make of expansion bellows Yes/No

Make of Strainer

Make of auto airvent



Make of two way motorised valve

Make of acutaor

Whether autopurge/relief/drain valve included in

piping as a part of the piping work

Whether RCC sleepers and refilling with sand Yes/No

included for trench piping

Make of tarfelt Yes/No

Thickness of tar felt

PRESSURE GAUGES

Make

Material of casing

Type

Range

Diameter

Type of isolating valve and material

THERMOMETERS

Make

Material of casing

Type

Range

Type of thermowell

COMMERCIAL DATA

ITEMS FOR WHICH CUSTOMS DUTY EXEMPTION IS

CONSIDERED

ITEMS FOR WHICH EXCISE DUTY EXEMPTION IS

CONSIDERED

COMPLETION PERIOD (MONTHS)

VAT INCLUDED%+

SERVICE TAX INCLUDED (%)

APPROXIMATE ENTRY TAX LIABILITY

INDICATED/NOT

INDICATED

WHETHER THE CONTRACTOR WILL

CLEAR THE CONSIGNMENT BEING IMPORTED YES/NO



CURRENCY AND EXCHANGE RATE

FOR IMPORTED ITEMS

SERVICE RESPONSE TIME IN HOURS

MAJOR DOWN TIME IN DAYS

MINOR DOWN TIME IN HOURS

GUARANTEE PERIOD IN MONTHS

WHETHER MARINE CUM ERECTION INSURANCE

INCLUDED Yes/No

PRICE FOR AMC SUBMITTED

Yes/No

NAME OF PROJECT MANAGER:

NAME OF ENGINEER 1

NAME OF ENGINEER 2

NAME OF SUPERVISOR 1

NAME OF SUPERVISOR 2

SPECIAL NOTE:

TENDERERS SHALL ENCLOSE WITH THEIR OFFER THE

FOLLOWING:

COMPANY PROFILE/LOCAL BRANCH

ORGANISATION CHART

SITE ORGANISATION CHART/SITE FACILITIES

INFRASTRUCTURE OF THE LOCAL OFFICE FOR

EXECUTION OF THE JOB &

SERVICE SET UP INDICATING THE MANPOWER

NAMEWISE.

ARRANGEMENT FOR DUCTING, PIPING &

INSULATION WORKS

LIST OF SIMILAR JOBS EXECUTED FOR THE PAST TWO

YEARS & JOBS UNDER EXECUTION

BIO-DATA & EXPERIENCE OF THE SITE TEAM

PROPOSED.



8. TESTDATA

TEST DATA

THE FOLLOWING READINGS SHALL BE TAKEN DURING THE TESTING

OF THE

AIR-CONDITIONING PLANT. FUNCTION OF EACH CONTROL,

ELECTRICAL INTERLOCK

SHALL BE TESTED. ALL THESE READINGS SHALL BE TAKEN JOINTLY

WITH THE

OWNERS/ CONSULTANTS OR THEIR REPRESENTATIVES AND SHALL

BE JOINTLY

SIGNED. A COPY OF THE TEST REPORT WITH CAPACITY

COMPUTATION SHALL BE

SUBMITTED TO THE CONSULTANTS.

1. AMBIENT CONDITIONS :

Dry bulb temperature - deg. C

Wet bulb temperature - deg. C

Relative humidity - %

2. INSIDE CONDITIONS : (These readings shall be indicated in the

as-built drawings)



Relative humidity - deg. C

3. GRILLE LEAVING TEMPERATURE /AIR FLOW/NOISE:

(These readings shall be indicated in the as-built drawings)



Relative humidity - deg. C

Air flow - CMH

Noise in dBA

4. WATER COOLED CHILLER PACKAGE:

COMPRESSOR:



Suction pressure - KSC

Discharge pressure - KSC

Oil pressure - KSC

Suction temperature - deg. C

Condensing temperature - deg. C

Compressor speed - RPM

Capacity in TR

Power consumed in KW

Motor speed - RPM

Voltage - Volts

Current at full load - Amps

Vibration level - microns

Noise level at 1m - dBA

(take noise level for different capacities)

CONDENSER :



Entering water pressure - (KSC)

Leaving water pressure (KSC)

Water flow - (LPM)

CHILLER

Entering water temperature - deg. c


Pressure at inlet - KSC

Pressure at outlet - KSC




5. COOLING TOWER

Entering air temperature - Deg. C

Leaving air temperature - Deg. C

Ambient wet bulb temperature - Deg. C

Entering water temperature - Deg. C

Leaving water temperature - Deg. C

Water flow - LPM

Voltage - Volts

Current drawn - Amps

Hardness of water in sump - PPM


(for both the speeds)

Vibration in microns

6. PUMPS

CONDE

NSER

PUMP

PRIM

ARY

PUMP

SECON

DARY

PUMP

Suction pressure - KSC

Discharge pressure - KSC

Noise at 1m - dBA

Voltage - Volts

Current - Amps

Vibration in microns

7. FLOOR MOUNTED AIR HANDLING UNITS

Entering air dry bulb temperature - deg. C

Entering air wet bulb temperature - deg.C



Leaving air dry bulb temperature - deg.C

Leaving air wet bulb temperature - deg.C

Water entering temperature - deg.C

Water leaving temperature - deg.C

Coil face area - Sq.mt

Face velocity - MPM

Air flow rate - CMH

Static pressure - MM wg

Fan speed - RPM

Voltage - Volts

Current - Amps

Water pressure at inlet - KSC

Water pressure at outlet - KSC


Vibration level - Microns


8. CEILING SUSPENDED/VERTICAL AIR HANDLING/FAN COIL UNITS

Entering air dry bulb temperature - deg. C

Entering air wet bulb temperature - deg. C

Leaving air dry bulb temperature - deg. C

Leaving air wet bulb temperature - deg. C

Coil face area - Sq.mt

Face velocity - MPM


Fan speed - RPM



Voltage - Volts

Current - Amps

Noise level at 1m -dBA

9. FAN FOR EXHAUST/FRESH AIR

Face area - Sq.mt

Face velocity - MPM


Fan speed - RPM

Voltage - Volts

Current - Amps

Noise level -dBA

10 FRESH AIR INTAKE

Face area - Sq.mt

Velocity - MPM

Air flow - CMH

11. VARIABLE FREQUENCY DRIVE UNITS:

Check for protection, bypass (manual mode)

Analyse operation at various test conditions

12. NOISE LEVEL

Noise level inside the conditioned area - dBA

13. IAQ LEVEL

Carbon-di-oxide measure in ppm for various

areas including basement

NOTE:

ALL INSTRUMENTS SHALL BE PROVIDED BY THE AIR-CONDITIONING CONTRACTOR.

PROVIDE CALIBRATION CERTIFICATE FOR ALL INSTRUMENTS

TAKE TEMPERATURE AND NOISE IN A GRID OF 3 X 3 M

GUIDELINES OF PARAMETERS:



Noise level inside the conditioned area - 45 dBA

Noise level of chiller at a distance of 1 m - not exceeding 78 dBA

Noise level of pumpsets and cooling tower at 1m distance - not

exceeding 75 dBA

Noise level of airhandling units at 1 m distance - not exceeding

65 dBA

Vibration level of airhandling units - not exceeding 75 microns

peak to peak

Vibration level of chiller and pumps - not exceding 100 microns

peak to peak

Coil face velocity across airhandling units shall not exceed 2.5

mps

Face velocity across filters having a thickness of 50 mm shall not

exceed 1.75 mps

Chiller capacity in TR and KW consumed shall be within a

tolerance of +/- 5%

The performance of all equipments shall be as per the

equipment schedule/technical submittal

approved and shall be within a tolerance of +/-5%

Air quantity shall be measured using digital anemometer

Dry bulb temperature shall be measured using electronic

thermometers

Wet bulb temperature shall be measured using sling

psychrometer with mercury thermometers

in deg. F scale

Noise level shall be measured using dB meter using octave band

scale

Flow shall be measured using balancing valve using electronic

gadgets

Water Pressure drop shall be measured using bourden type

pressure gauge

Air side pressure drop shall be measured using manometer

Electrical parameters shall be measured using voltmeters,

ammeters, power factor meters and watt

meter

Speed shall be measured using electronic stroboscope

For differential readings use the same instrument

For IAQ measurement use Infrared Carbon-di-oxide sensor



9. QUALITY CHECK LIST

QUALITTY CHECK LIST

Area : Drawing No:

Date :

PAGE OF

Checked by : DUCTING

DESCRIPTION CHECK LIST

GENERAL

MATERIAL OF DUCT SHEET GI/ALUMINIUM

THICKNESS OF SHEET AS PER REQUIREMENT

QUALITY OF ALUMINIUM GI SHEETS BRIGHT/SOILED

FABRICATION:

FOLDING PROPER / IMPROPER

JOINTS LEAK/AIRTIGHT

FLANGES WAVY / STRAIGHT

BOLT HOLES UNIFORMLY SPACED OR NOT

GAP NEAR FLANGE TERMINATION YES/NO

CUT SHEETS YES/NO

CROSS BREAKING/BRACING YES/NO

VANES

ANGLE IRON FLANGES:

THICKNESS OF ANGLE AS PER REQUIREMENT - YES/NO

UNIFORMLY CUT YES/NO

WELDING PROPER / IMPROPER

PRIMER AND BLACK PAINT APPLIED / NOT APPLIED

CORNERS/EDGES SHARP / BEVELED / GROUND

BOLT HOLES UNIFORMLY SPACED OR NOT

GASKETS:

THICKNESS AS PER REQUIREMENT - YES/NO

QUALITY OF GASKET ACCEPTABLE / NOT ACCEPTABLE

FIXING OF GASKET PROPER / NOT PROPER

FASTENERS:

QUALITY ACCEPTABLE / NOT ACCEPTABLE

MATERIAL OF FASTENER GALVANISED / MS

SUPPORTS:

THICKNESS AS PER REQUIREMENT - YES/NO

QUALITY ACCEPTABLE / NOT ACCEPTABLE



DIFFUSERS/GRILLES:

QUALITY ACCEPTABLE/NOT ACCEPTABLE

PAINTING PROPER / IMPROPER

LOUVERS STRAIGHT / BENT

DAMPER:

MATERIAL GI / MS

FINISH PAINTED / POWDER COATED

THICKNESS OF SHEET AS PER REQUIREMENT - YES/NO

ERECTION WORKS:

DUCTING:

TIGHTNESS OF JOINTS PROPER / IMPROPER

FLANGES BELOW BEAM YES / NO

SPACING OF SUPPORTS PROPER / IMPROPER

BOTTOM OF DUCT AS PER REQUIREMENT - YES/NO

GRILLE/DIFFUSER FIXING:

PLENUM WITH DIFFUSERS PROPER / IMPROPER

COLLAR/DROPPER LENGTH SUFFICIENT / INSUFFICIENT

ALIGNMENT PROPER / IMPROPER

DAMPER OPERATION POSSIBLE / NOT POSSIBLE

CONTINUOUS GRILLE JUNCTIONS PROPER / IMPROPER

BLACK PLAINT FOR SCREWS DONE / NOT DONE

Item: Packaged unit

Area: DX UNITS

FINISH / APPEARANCE ACCEPTABLE/ NOT ACCEPTABLE

SUPPORTS FOR UNITS PROPER / IMPROPER

PAINTING OF SUPPORT PROPER / IMPROPER

SLOPE TOWARDS DRAIN PROPER / IMPROPER

SPACE FOR AIR FLOW SUFFICIENT/INSUFFICIENT

VI PADS FOR OUTDOOR UNITS PROVIDED NOT PROVIDED

ISOLATION DAMPER PROVIDED/NOT PROVIDED

DRAIN PIPING

PRESSURE TESTING DONE / NOT DONE

SUCTION LINE INSULATION MISSING / FOUND

Item:

Area:

ROOF INSULATION:

MATERIAL OF INSULATION EPS/FIBREGLASS/FOAM

THICKNESS AS PER REQUIREMENT YES/NO

GI WASHERS YES/NO

BINDING WIRES YES/NO



WHETHER TF YES/NO

ELECTRICAL:

CABLING & EARTHING DONE / NOT DONE

TERMINATIONS PROPER / IMPROPER

TRAP DOORS:

SIZE ADEQUATE/INADEQUATE

OPERATION EASY / DIFFICULT

EQUIPMENT EASILY ACCESSIBLE YES / NO

Item: Piping

Area:

PIPING

APPEARANCE CLEAN/RUSTED

PIPES CLEANED ON INSIDE YES/NO

THICKNESS/CLASS AS PER REQUIREMENT

CUTTING PROPER/IMPROPER

WELDING PROPER/IMPROPER

SUPPORTS AS PER REQUIREMENT

DRAIN PIPING

SLOPE OF DRAIN PIPES PROPER/IMPROPER

ACOUSTIC INSULATION:

SECURING OF PERFORATED SHEET PROPER / IMPROPER

FASTENERS MISSING / FOUND

SAGGING INSULATION YES/ NO

EXPOSED FIBREGLASS YES / NO

THERMAL INSULATION:

MATERIAL OF INSULATION FIBRE GLASS / EPS/SYN. FOAM

THICKNESS AS PER REQUIREMENT - YES / NO

WHETHER TF GRADE YES/NO

DENSITY KG/CUM.A280

ALUMINIUM FOIL PROPER / IMPROPER

ALUMINIUM TAPE MISSING / FOUND

SAGGING INSULATION YES / NO

EXPOSED FIBERGLASS YES / NO

Owners Representative Consultants Representative

Contractors Representative



10. GUIDE LINES FOR PROJECT EXECUTION

On receipt of the order/LOI the successful contractor shall submit the following:

Price break up for the contract value

Copies of the offer, minutes of the meeting, all correspondence for agreement

Site insurance policy

Site team with the profiles of the entire team with mobile numbers

Bar chart for the works

List of items for which CT-3 is required

List of items for which ‘C’ form is required

List of imported items

Copy of the purchase order to consultants for bill checking

TECHNICAL SUBMITTALS

On award of contract, the successful contractor shall prepare the technical submittals and obtain the approval from the consultants.

The draft submittal has to be submitted in 2 sets. On receipt of comments the same shall be submitted in four sets for formal approval. The commented copy shall also be returned for reference. Submittals shall be made in 1 lot for all items

and no part approval will be granted.

The submittals shall be prepared with the submittal control sheet as the cover sheet.

The submittal shall contain the following:

Chillers packages:

Technical data sheet in Excel format

Computer selection chart with part load with and without ARI relief

Catalogue of chiller and plant manager

GA drawing of the chiller with foundation details

Pumpsets:


Pump curves

Catalogues of the pumps, variable speed drives and differential pressure sensor

GA drawing of the pumpsets

GA drawing of the VFD panel

Single line drawing of the VFD panel

Location of the differential pressure sensor



Cooling Towers:


Performance charts

Catalogues of the cooling tower

GA drawing with Foundation details for the cooling tower

Airhandling units & fans

Technical data sheet in excel format

GA drawing of the airhandling unit

Fan curves and noise spectrum

Foundation drawing of AHU

Catalogue of AHU, fans

Variable speed drives:


GA drawing of VFD panel

Single line drawing of the panel

Catalogue of Drive and duct pressure sensor

Electrical panel:


GA drawing

Single line drawing

Motorised valves:


GA drawing

Catalogue

Valve selection table

Ducting, Air terminals, Sound attenuator, Fire damper, Volume control dampers, Flexible ducts, spiral ducts, filters, pipes, valves, insulation, pressure gauges, thermometers, Rubber bellows, cabling and earthing, expansion tank:


Catalogues



ELECTRICAL LOAD SUMMARY:

On approval of the submittals an electrical load summary sheet with the electrical load of various equipments, location of the power points shall be submitted. The load summary sheet in the tender has to be used with added columns for the actual load and location.

SAMPLES:

Samples shall be made as per the sample control sheet for various items. The approved samples shall remain at site.

MOCK UP:

Mock up shall be made as per the mock up control sheet for various works. The HVAC agency shall co-ordinate with the concerned for the execution of the mock ups.

DRAWINGS:

A control sheet for drawings shall be prepared by the contractor.

Working drawings shall be prepared based on the Architects/Consultants drawings followed by site measurements wherever applicable. First cut drawing shall be submitted in 2 sets. On receipt of comments 6 or more sets as required shall be submitted along with the soft copy in CD. The commented copy shall also be returned for reference. 2 sets of A 3 drawings (one in colour and the other in Black and white) shall be submitted in a spiral bound folder.

Duct drawing

Show duct numbers, duct supports, Airquantity through each outlet, quantities of ducting, acoustic insulation, thermal insulation, underdeck insulation, grilles, diffusers, sound attenuators, fire dampers, VAV. Bring out the equipment technical details such as dimensions, weight and equipment load in KW with detailed notes.

Show the partition walls upto slab, upto false ceiling and partition above false ceiling, trap door for maintenance etc.

Show the specifications for ducting and insulation, levels for the slab, capital, beam, top of duct and flange, bottom of duct flanges and low and high false ceiling from finished floor levels

Submit a statement for each area and floor a deviation report of the various levels as mentioned above in actuals based on the site conditions vis-à-vis the tender

Submit a separate drawing showing only the cutouts, openings, partition levels, equipment dimensions, operating weight, VAV power points, power point for equipments with battery limits



Submit sectional drawiings

Power points for the VAVs shall be shown in the drawing

AHU room drawing:

AHU room drawing shall show the AHU with dimensions, weight, power in KW, complete with piping, valves, floor drain, drain point for the AHUs, Fire damper, Fresh air damper, Sound attenuators, DDC panel, VCD, VFD location, power point for Fire damper, 2/3 way valves with detailed notes.

Submit sectional drawings

Submit schedule of AHUs with dimensions, capacity in TR, CFM, KW, Operating weight, Coil orientation, details of filters, quantities of piping, valves, insulation, Fire damper, sound attenuator, plenum, Volume control damper

GA drawing of the AHU along with the plenum GA drawing shall be shown in the AHU drawing

A separate drawing showing only the foundation of the AHU with weights and KW, wall openings, slab openings, power point for the VFD, fire damper, DDC panel, floor drain, AHU drain and cable entry to AHU shall be submitted. AHU foundation shall be PCC for the entire size of the AHU with noising frame.

Show the battery limit for various works

Plant room Drawing

Plant room drawing shall show the various equipments, with interconnected piping and supports.

The dimensions, capacity, operating weight of the equipments shall be indicated

Show the location of the pump panel, VFD panel, Chiller panel, Plant Manager, DDC on the drawing

Show the water point for expansion tank, cooling tower with additional point for cleaning and drain point

Submit the schedule of the equipments with quantities for piping, valves and insulation

Submit sections

Submit a separate drawing showing the foundation with dimensions, weight (point load details for chiller), KW, cable entry positions, Chiller Yard lighting, water, drain and power points



Buried piping Drawing:

The drawing shall show the pipes with supports, reference from the building and levels. Quantities of piping, valves, insulation, RCC blocks shall be indicated.

Show various sections, details of entry into the building, cross over with other services

Show the specification for piping and insulation

Show the manholes and valve access

STANDARD DRAWING:

Submit Standard drawing for ducting and piping

COST DEVIATION SHEET:

A job cost deviation sheet as per the BOQ bringing out the quantities in the tender vis-à-vis the approved shop drawings with the cost deviation shall be submitted.

SITE EXECUTION:

All relevant documents shall be kept a site office.

The contractor shall ensure that the materials delivered are in line with the approved technical submittals and samples.

The contractors during the review of the work progress by the Consultants shall substantiate the milestones in the bar chart with the delivery confirmation from the respective suppliers.

Quality check forms as per the tender conditions shall be strictly maintained. Incomplete quality check forms may result in rejection of the work done and no payments will be made incase the work is acceptable also.

Work shall be done strictly as per the specifications and drawings. Deviations if any shall be brought clearly in writing and approval has to be sought by the Consultants.

The Contractor shall submit work schedule on daily basis indicating the manpower deployed, activity done for the day, activity proposed for the following day, hold up if any, delay in progress due to non availability of material and co-ordination required from other services.

Contractors shall produce the documents for pressure testing for the chilled water lines, condenser water lines and refrigerant lines and the same shall be certified by the consultants

Contractors shall produce the documents for smoke test for the ducts and X ray test for the pipes.



As built ducting drawings shall be submitted before closure of the false ceiling along with measurement sheets and quality check lists

Monthly reports with photographs, quality check forms, status of material delivery, work progress shall be submitted as in called in for.

On Completion of the installation work, the contractor shall test the system and take abstract test readings strictly as per tender format. The readings shall be in line with the technical submittals. Incase of discrepancy corrective action has to be taken by the contractor. Based on this joint inspection and testing will be organised.

Snag list will be prepared by the consultants. The plant will be considered for handing over only after completion of all the pending points by the contractor.

Following shall be submitted during handing over:

As built drawings in 5 sets with 3 sets of soft copies in CD

4 sets of operation and maintenance manual – the manual shall contain the design brief, heat load summary, approved technical submittals with catalogues, operation and maintenance literatures of all equipments, Electrical load summary sheet, A3 sized as built drawings, suggested spares, log sheet formats, operation procedures etc.,

Snag compliance chart in 4 sets

Water balancing and air balancing reports

Test readings in conditioned area, equipments, noise, vibration, IAQ strictly as per the tender format.

Service response time, down time, details of personnel to be contacted for service with address and contact numbers shall be indicated in the Operation and Maintenance manual.

Final bill with job cost deviation, measurement sheets with non tendered items shall be submitted with soft copy. The final bill shall be submitted in 3 sets.

The contractor shall train the users operating team as per the tender conditions.

The plant will be considered for handing over only after submission of all the documents and guarantee period will commence only from the date of handing over.



11. SPECIFICATION OF EQUIPMENTS & MATERIALS

11a. EQUIPMENTS

WATER COOLED CHILLER PACKAGES

Water chiller packages shall be factory assembled comprising of Compressor, Drive motor, Shell and tube type Condenser, DX/Flooded evaporator, refrigerant pipes and fittings, micro processor based controls, lubrication system, water pressure/flow switch, anti-vibration springs, suction line and evaporator insulation, first charge of refrigerant gas, oil etc. All the equipments shall be mounted on GI or MS powder coated mounting frame fabricated out of channels, angles and other sections. The sections shall be powder coated or hot dip galvanized. The chiller packages shall be mounted on vibration isolation spring mounting. The chiller package performance shall be tested as per ARI standards. The chiller shall be suitable for operation with HFC 134 a refrigerant strictly as specified. The noise level of the chiller shall not exceed 75 dBA at a distance of 1m from the chiller package or lower as specified. Provide factory made sound attenuators for compressors wherever required to meet the noise criteria.

COMPRESSOR

The compressors shall be of screw type in multiple numbers with independent circuits as specified.

The screw compressor shall be semi-hermetic/hermetic or open type. The compressor speed shall not exceed 2900 RPM. The compressor rotor shall have less tip clearances so that the leakage between high and low pressure side is minimized during compression. The compressor shall unload from full load to the minimum capacity by means of a slide valve. The slide valve shall be positioned over both the male and female rotors. The chiller shall have an electronic expansion valve. The compressor shall be provided with phase loss, phase reversal, phase imbalance and incorrect phase sequence apart from overload and under load protection.

DRIVE MOTOR

The compressor drive motor shall be of TEFC squirrel cage type (in case of open type screw compressors) having IP-55 protection with class F insulation. The class of insulation shall be F in the case of gas cooled semi-hermetic compressors. The speed of the compressor motor shall not exceed 3000 RPM. The motor shall be of energy efficient type with a high and flat efficiency curve from 50 to 100%. The starter shall be of soft type with lesser starting current. Test certificates shall be produced for the motors.

CONDENSER

The water cooled condenser shall be of shell and tube type with cleanable and individually replaceable copper tubes. The tubes shall be integrally finned and expanded into tube sheets. Tubes shall be with minimum 19 mm OD with nominal minimum wall thickness of not less than 0.635 mm measured at the top of fin.

The design shall permit better performance with optimum water flow, lower pressure drop and lower condensing temperatures. The condenser shall have subcooling circuits. The condenser shall be factory tested for a pressure of 28 KSC on the refrigerant side. The water boxes shall be designed for 11 KSC working pressure and pressure tested at 16 KSC. The shell shall be constructed out of rolled



carbon steel plate with fusion welded seams and carbon steel tube sheets welded to each end. The water boxes/Head shall be of removable type to permit tube cleaning. The pressure drop shall not exceed 0.75 KSC and the water tube velocity shall not exceed 3.00 mps.

The condenser shall have a fouling factor of 0.001 (BT Units). ASME coded refrigerant side relief valve with full pump down capacity in condenser with multiple water passes shall be provided. Provide rubber isolating bellows for the condenser water line. Provide descaling tee for descaling the tubes without removing the pipes. The condenser water line shall be provided with a water pressure/flow switch. The condenser shall have flanged connection for the water lines.

CHILLER

The water chillers shall be of shell and tube horizontal type with carbon steel shell and seamless copper tubes. The tubes shall have a minimum diameter of 16 mm. Adequate number of properly spaced baffles shall be provided for maintaining optimum water velocity and heat transfer. Tubes shall be adequately supported. Chiller shall have a fouling factor of 0.0005 (in British units). The chiller shall be designed for a working pressure of 14 KSC for the tube side and 7 KSC for the water side. The chiller shall be tested in the factory for a minimum pressure of 21 KSC for both the tube and water sides. Test certificates shall be produced for the chillers. The chiller shall be factory insulated using 2 layers of 19 mm thick nitrile rubber insulation after pressure testing. The chiller shall be complete with rubber bellows for the pipe line and with water pressure failure switch/flow switch. The chiller shall have flanged connection for the water lines.

CONTROLS

The refrigerant flow control shall use an electronic expansion valve. The chiller shall have factory installed microprocessor control for various control functions. The control centre shall have a 40 character alphanumeric Liquid Crystal display. The screen shall indicate chiller operating hours, entering and leaving condenser and chilled water temperatures, evaporating and condensing temperature of the refrigerant, oil pressure and temperature, operating voltage, % load and motor current. The chiller shall be suitable for digital programming of various set points such as leaving chilled water temperature, percent current limit, pull down demand limiting, seven day time clock for starting and stopping. All safeties shall be annunciated through alphanumeric display. The safeties shall include high condenser pressure, low oil pressure, high oil temperature, compressor thrust bearing oil temperature, low evaporator pressure, high motor winding temperature, motor over current, over voltage, under voltage, phase reversal etc. The chiller shall be offered with factory built Plant Manager as specified. The plant manager shall be able to compute the capacity in TR (measured by external gadgets), entering and leaving chilled water temperatures and entering condenser water temperatures and power consumed in KW using the voltage, current, and power factor for various compressor loads. The results are to be logged in the form of a table. The capacity obtained and power consumed shall be compared with the performance charts for performance evaluation. The chiller shall have provision to hook up with building automation system and shall be compatible with Bacnet, Modbus, Profibus protocols. Necessary hardware shall be included as a part of the plant manager in this regard. The chiller shall be provided with a single incoming MCCB, ACB interconnecting all the sub MCCB/ACB for various circuits. The electrical panel shall have IP 55 protection.

MICROPROCESSOR PANEL

The following system protection shall automatically act through micro computer control to ensure system reliability depending upon the machine design:



Low suction pressure

High discharge pressure

High oil temperature

Freeze protection

High water temperature

Low oil level

Compressor run error

Power loss

Chilled water flow loss

Sensor error

Compressor over current

Anti recycle

Motor current signal loss

Under/over voltage

Low evaporator refrigerant temp

High compressor discharge temp

Low oil pressure

Loss of condenser water flow

Starter fault

High oil pressure

Excessive starter transition time

Motor current signal loss

Motor power supply, Phase reversal, phase imbalance, incorrect phase sequence

Temp. Sensor & transducer fault

Motor wiring protection

Single cycle dropout

If the abnormal operation condition continues and protective limit in reached, the machine shall be shut down.

The 40/80 character Alpha numeric liquid crystal display utilising menu driven software shall obtain information/measurements on the display screen.

A chiller report

A refrigerant report

Compressor report

An operating configurable custom report

Evaporator pressure

Condenser pressure



System voltage

Compressor Amps drawn each compressor/phase

Compressor elapsed run time for each compressor

- Compressor contactor status

Optical oil float switch status.

- Water temperature reset value.

Water flow switch status

External start/stop command status.

An operator configurable custom report.

Operator settings.

Service tests and diagnostics message display in clear language by pressing the appropriate button.

The unit control module, utilizing the adaptive control micro processor shall automatically take action to prevent unit shut down due to abnormal operating conditions associated with low evaporator refrigerant temperature, high condensing temperature, pressure and motor current, over load, high motor amps. The operating program shall eliminate chiller failure due to failure of AC power supply.

QUALITY ASSURANCE

(a) Chiller performance should be rated in accordance with ARI standard 550 (latest addition)

(b) Equipment and installation shall be in compliance with ANSI/ASHRAE 15 (latest addition)

(c) Cooler & condenser shall include ASME U Stamp & name plate certifying compliance with ASME section VIII Design I code for unfired pressure vessels.

(d) Chiller shall be manufactured in a facility that has been registered by UL to the ISO 9000 standards for quality.

(e) Chiller shall be designed and constructed to meet UL & CSA requirement and shall have labels appropriately affixed.

(f) Each compressor assembly shall undergo a mechanical run in test to check proper operation of components and to verify that vibration level, oil pressure/temperature and efficiencies within acceptable limits at the manufacturing unit. Each compressor shall be pneumatically pressure tested at 405 Psig or (2792 KPa) and leak tested with a tracer gas at 225 Psig or (1551 KPa).

(g) Both cooler and condenser shall be pressure tested at 375 Psig (2586 KPa) on the refrigerant side and leak tested with Refrigerant tracer gas at 300 Psig (2068 KPa). The water side of each heat exchanger shall be Hydrostatically tested at 1.5 times rated working pressure.

(h) The entire chiller assembly shall be leak tested with a refrigerant tracer gas at 300 Psig (2068 KPa).



(i) Prior to shipment the chiller packages shall be tested for proper operation of controls.

(j) Unit shall be supplied charged with the specified refrigerant or nitrogen holding charge and oil and refrigerant gas in separate cylinders for charging in the field.

(k) Unit shall be supplied with all refrigerant piping and control wiring factory installed.

Wherever specified, Microprocessor controlled Plant Manager shall be provided for controlling multiple chillers. The plant manager shall sequence chillers for uniform wear and tear and shall select and run compressors efficiently resulting in power saving. The plant manager shall have ASHRAE BACNET or modbus protocol for hooking on the same. The chiller shall be provided with cable entries and earth terminal bolts. If so desired the consultants/Owners may depute their representatives to the manufacturer’s unit to visualise the tests. Before inspection the manufacturers shall send a format of the test report on which readings will be taken. In the absence of factory inspection the manufacturer shall perform the test and send the test report to the consultants/owners and obtain clearance before despatching the chillers.

CHILLER PERFORMANCE TESTS

To ensure quality, guaranteed efficiency and performance in compliance with the Specified conditions, at least one unit of each model of the package liquid chiller shall be fully tested.

The tests shall be conducted at the manufacturer’s factory or workshop where proper testing facilities are available and the test results shall be submitted to the Consultant Engineer upon delivery of chiller. The design ambient condition should be simulated during the chiller performance test.

The contractor shall be responsible for the arrangement of the tests and all expenses Incurred for two people one client’s representative and one Consultant’s representative including air travel, accommodation and all other expenses.

After assembly and pressure testing the chiller shall be tested on the following (in accordance with ARI whenever applicable)

Full load capacity.

Capacity control range as specified and stability of operation at minimum load.

Efficiency at full load and partial load. Readings of chiller performance at 100% 80% 70% 60% 50% and minimum loadings are required.

Safety device activation.

Pressure drop across evaporator and condenser.

Noise levels at various points.

Vibration levels at various points.

The contractor shall submit the test schedule at least one (1) month before the proposed date of testing.



COOLING TOWER

The cooling tower shall be of vertical induced draft type with FRP construction. The fan shall be of axial flow type statically and dynamically balanced. The motor shall be of high efficiency TEFC type with IP 55 protection and class F insulation having a high and flat efficiency curve for 50 to 100% loads suitable for vertical installation. The fan shall preferably direct driven eliminating the gear box/belts. The fan assembly shall be easily accessible for inspection and periodical maintenance. The fan shall be provided with a fan guard. The fan shall have low noise. The honey comb PVC fills shall be double folded with an automatic drainage system, producing a favourable pressure drop and a good protection against erosion. The fills shall withstand a temperature of around 65 deg. C. High efficiency drift eliminators having a drift loss lesser than 0.001% under standard design conditions shall be provided. The FRP casing and trough shall be of corrosion resistant fibre glass with a longer service life and shall be available with various colour choices. All the supporting structures shall be hot dip galvanised. All the fasteners shall be of stainless steel type. The tower shall be complete with air intake mesh either galvanised or plasticised, GI ladder, Suction tank, strainer, make up water valve, float, overflow and drain connections. The noise level of the cooling tower shall not exceed 75 dBA at distance of 1m from the tower. Test certificate shall be provided for the cooling tower. The cooling tower shall be provided with a vibration switch to switch off the fan incase of excessive vibration. Provide cushy mounts for the tower.

The towers wherever specified shall be with fire rating of the PVC fill integral with louvers and drift eliminators with a flame spread index of 25 or less as per ASTM E-84 Steiner Test.

Wherever specified provide sand media filter. The filter tank shall be constructed of fibre reinforced glass plastic with filter media, filter unit pump, piping between the components, three way diverting valve and necessary unit accessories and control panel. The filter media shall be provided with spherical based crystalline silica with nominal diameter of 0.85 mm diameter and shall ensure high filtration efficiency. The pump motor shall be of TEFC type with IP 55 enclosure and class F insulation. The unit shall be complete with filter control panel with automatic back wash facility.

Provide two-speed motor for the cooling tower fan controlled by the sump water temperature.

. CENTRIFUGAL END SUCTION PUMPSETS

The pump set shall be of non priming single stage centrifugal volute with axial suction port and radial discharge port, horizontal shaft components with horizontal coupled motor. Pump casing shall be of close grained cast iron. The pump shall be complete with bronze impeller, mechanical seal, air cock, base frame, anti vibration mounts and drive motor. The impeller shall be statically and dynamically balanced. Suction passages shall be volute in form, promoting smooth entry to impeller and increasing the efficiencies. The drive shaft shall be of high tensile steel and the shaft sleeve shall be of bronze or gunmetal. All outside surfaces shall be machined and water passages finished to reduce friction loss. The bearing assembly shall be with be single row antifriction ball/roller type bearing lubricated for life contained in separate easily removable housing. A thrower on the shaft shall prevent water entering the bearing assembly. The pump and motor shall be mounted on a common base frame. The coupling shall be of flexible type with steel pin and rubber bushing. The motor shall remain in position during dismantling of the pump set so as to avoid subsequent alignment. The complete bearing assembly including impeller and shaft seal shall be dismantled without removing the volute casing from the piping. The shaft seal shall be of mechanical type. .The pump shall be mounted on factory made inertia frames with anti vibration mounts and placed over concrete foundation blocks with nosing frames. The nosing frames are to be provided by the air-conditioning contractor. The fixing bolts shall be of stainless steel. Cushy foot isolators shall be used and rubber pads are not permitted. The speed of the pumps shall not exceed 1450/2900 rpm as specified. The pump shall be suitable for flange connections. Pressure gauges with needle valves shall be installed at the suction and discharge lines as shown in the drawings. The vibration of the pumpsets on the



bearing shall not exceed a peak-to-peak displacement of 100 microns. Provide rubber bellows at the inlet and outlet pipelines of the pumpsets. The noise level of the pump shall not exceed 75 dBA at a distance of 1 m from the pump. Provide canopy for the motor when exposed to weather.

MOTORS

The motor for the pumpsets shall be squirrel cage totally enclosed and fan cooled type with class F insulation and IP 55 Protection. The motor shall be high energy efficiency type having a high and flat efficiency curve for 50% to100% loads. The frame shall be of close grained cast iron and the stator and rotor cores shall be built of low loss high permeability sheet steel laminations. Windings shall be of high conductivity copper bars with both ends braced to heavy shorting rings. The shaft shall be of precision-machined high tensile mild steel bars and have sufficient margin for shock loads. The motor shall be statically and dynamically balanced. Bearings shall be combination of ball and roller type with readily accessible grease nipples. Terminals shall be amply sized and housed in a terminal box, which shall be suitable for cable or conduit entry. Two earth terminals shall be provided. The starting torque shall match with the load torque. Unless otherwise specified the motors shall be suitable for 415 V 3 phase, 50 cycles AC supply and shall conform to IS: 325. The continuous BHP rating of the motor shall be atleast 110% of the maximum power requirement to allow for voltage fluctuations and drive losses as per NEMA standards. The vibration of the motors on the bearing shall not exceed a peak-to-peak displacement of 100 microns. Necessary external terminal box for cable termination shall be a part of the motor.

The motor and pump will be factory assembled, coupled and aligned by a coupling and field assembly of pump and motor is not permitted.

FLOOR MOUNTED AIR HANDLING UNITS FOR COMFORT APPLICATIONS

The airhandling unit shall be of modular type with pentapost frame and sandwich panels. The panels and the post shall be fabricated from heavy gauge galvanised steel sheet. Panels and frame shall be secured using internally bolted fixings so that welding is avoided and the integrity of the finish is maintained. The construction shall permit removal of panels for maximum access to fans, coils and filters. The removal of the side panels must not affect the structural integrity of the unit. The panels and frame shall be factory painted with durable oven cured polyester based powder paint or powder coated. The casing shall have double skin construction of 25mm or 50 mm thick fabricated out of minimum 0.6 mm thick sheet with plain powdercoated/plasticised sheet as the outer skin and perforated sheet for sound absorption or plain sheet as the inner skin. The material of insulation shall be fibre glass or polyurethane foam. The insulation material shall be covered with RP tissue to prevent flying of the material incase of perforated sheet inner skin. The floor panels also shall have double wall construction with 25/50 mm thick sandwich type polyurethane foam nsulation for a rigid non-vibrating construction. Provide an inbuilt sound attenuator as a part of the airhandling unit having a depth not exceeding 900mm so as to have a sound pressure level not exceeding 65 dBA at 1m from the filter. The whole unit shall be mounted on a galvanised steel base frame for easy shipment and handling. The base shall have clearance from the floor to ensure air circulation and avoid entrapment of moisture below the unit. The unit shall have a sloped stainless steel drain pan with a bottom/side connection to eliminate stagnation of condensate water. Drain pan shall have minimum 1mm thick sheet with sandwiched insulation of 25/50 mm thick. All the panels shall be flush mounted. There shall be no sharp edges or corners or fasteners projecting out on the unit which might cause injury. Provide rubber caps for screws protruding inside the units. Sealing shall be by means of a non-hygroscopic gasket compressed between the frame and the panels. Access panels with hinged doors shall be provided to maintain and service the fan and filters. The fan section shall have DIDW centrifugal forward/backward curved blower mounted on vibration isolation mountings with its bearings fixed on the scroll. The fan shall be complete with belt drive package. The impeller and shaft of the fan shall be both statically and dynamically balanced. The drive package shall also be balanced properly. The fan and motor assembly shall be mounted on a common frame work entirely



isolated from the unit by rubber-in-shear or spring vibration mountings. The fan discharge shall be isolated from the casing by a canvas. Provision shall be made on the airhandling unit for entry of electrical cables and earth termination and no field cutting is permitted. The airhandling unit shall be provided with a limit switch on the door and the same shall be field wired to switch off the blower when the door is opened. The unit shall be provided with marine lights inside. The lights shall come on when the door is opened or by means of a external switch and wiring shall be done in the field accordingly. The airhandling units shall be provided with aluminium outlet damper with PVC gears suitable for connecting to an actuator. The damper shall also be suitable for manual operation. The units shall be provided with one set of commissioning filters of throw away type apart from the regular set of filters. Permanent filters shall be installed once cleared by the Consultants.

The Coils shall be of fin and tube type having copper tubes and aluminium fins. The tubes shall have a minimum diameter of 12 mm. The number of fins shall be 5 per cm. The tubes shall be mechanically expanded by means of a mandrel for optimum tube to fin bonding. The fins shall be plate or spiral and tubes shall be staggered. Headers shall be of MS. The air face velocity across the coil shall not exceed 2.5 m/sec. The coils shall have capped vent and drain connections provided on the headers. Cooling coils of water duty shall be tested for 7 KSC working pressure. The filter section shall be provided with the same casing construction as that of the unit. The face velocity shall not exceed 1.75 mps for 50mm thick filters and 4.25 mps for 150mm thick filters. The Pre filters shall be of panel type with synthetic non woven washable type media with GI framework. Alternatively pocket/bag filters shall be offered. The filter shall have an arrestance of 90% down to 10 microns. The filters shall be easily removed for cleaning. Proper gaskets are to be provided to prevent air leakage through the filter section.

The vibration of the airhandling unit fans on the bearing shall not exceed a peak-to-peak displacement of 75 microns.

The motor shall be of TEFC squirrel cage type having class F insulation and IP 55 protection. The motor shall be of energy efficient type with high and flat efficiency curve for 50 to 100% load. Wherever specified provide twin motor with frame work so that incase of the failure of one motor the other can be put into operation. The motor shall be suitable for operation using a variable frequency drive wherever specified. Provide external terminal box for cable termination as a part of the motor.

For treated fresh air units provide the casing with 50 mm thick insulation with thermobreak sections.

Tenderers shall produce test certificates for the fans. If so desired the consultant/Owners may depute their representatives to visualize the tests. Incase the airhandling units are to be knocked down for easy shifting into the airhandling unit rooms, the reassembling of the units shall be done by the authorized representative from the Manufacturers using proper tools and tackles. Wherever specified, the unit shall be provided with factory made mixing box, filter plenum, supply plenum. The noise level of unit shall not exceed 65 dBA at 1m from the filter side

After assembly the entire airhandling unit shall be smoke tested for leaks. Conduct leakage tests as per SMACNA where demanded by Consultants.

CEILING SUSPENDED/VERTICAL FLOOR MOUNTED AIRHANDLING UNITS

The air handling units shall be constructed with filter coil and fan. The airhandling units shall be suitable for ceiling suspension or floor mounting as mentioned. The panels and frame shall be factory



painted with durable oven cured polyester based powder paint or powder coated. The casing shall have double skin construction of 25mm or 50 mm thick with minimum 0.6 mm thick Galvanised sheet with plain powdercoated/plasticised sheet as the outer skin and perforated sheet for sound absorption or plain sheet as the inner skin. The material of insulation shall be fibre glass or polyurethane foam. Special protective layer has to prevent flying of the material. The bottom panel also shall have double wall construction with 25mm thick sandwich type polyurethane foam/glass wool insulation for a rigid non-vibrating construction. The fan section shall have DIDW centrifugal forward curved blower mounted on vibration isolation mountings with its bearings fixed on the scroll. The fan shall be complete with belt drive package. The impeller and shaft of the fan shall be both statically and dynamically balanced. The fan shall be suitable for belt drive. Direct drive package will not be accepted. The drive package shall also be balanced properly. Only belt driven fans are acceptable. The unit shall be provided with adequate size access door for easy maintenance. The access door shall be easily accessible either from the trap door on the false ceiling or the hatch doors on the wall. The Coils shall be of fin and tube type having copper tubes and aluminium fins. The tubes shall have a minimum diameter of 12 mm. The number of fins shall be 5 per cm. The tubes shall be mechanically expanded by means of a mandrel for optimum tube to fin bonding. The fins shall be plate or spiral and tubes shall be staggered. Headers shall be of MS. The face velocity across the coil shall not exceed 2.5 m/sec. The coils shall have capped vent and drain connections provided on the headers. Cooling coils of water duty shall be tested for 7 KSC working pressure. Drain pan shall be of one piece construction fabricated out of heavy gauge Stainless steel sheet with insulation. Drain pan shall extend under the coil and fan sections with drain connection on both sides. Drain connection shall be minimum with 50 mm diameter pipe. A tray fabricated out of heavy gauge sheet with a drain sprout leading to the drain pan shall be installed below the valves and strainers. The unit shall be provided with an electrically operated pump with water level sensor to remove the condensate water from the drain pan and pump into the drain pipe automatically. The filter section shall incorporate cleanable type filter with synthetic nonwoven media. The face velocity shall not exceed 1.75 mps for 50mm thick filters and 4.25 mps for 150mm thick filters.

The filter shall have metallic frame with GI wire mesh protection on both sides. The filter shall have an arrestanc of 90% down to 10 microns. The filters shall be easily removed for cleaning. The vibration of the airhandling unit fans on the bearing shall not exceed a peak-to-peak displacement of 75 microns. The ceiling suspended units shall be supported using special fully threaded supports with vibration isolators. The motor shall be suitable for 3 phase operation. Provision shall be made on the airhandling unit for entry of cables and earth termination. Tenderers shall produce test certificates for the fans.

The motor shall be of TEFC squirrel cage type having class F insulation and IP 55 protection. The motor shall be of energy efficient type with high and flat efficiency curve for 50 to 100% load. The motor shall be suitable for running through a Variable Frequency drive. Provide external terminal box for cable termination as a part of the motor.

Provide a set of commissioning filters along with the standard filters. The unit shall be provided with a drain pump for mechanically pumping the condensate drain. The unit shall have knock out for taking the cables inside the unit. The unit shall be provided with outlet damper having aluminium construction with PVC gears suitable for motorised operation as a part of the unit. The damper shall also be suitable for manual control.

The floor mounted vertical units shall be similar to the ceiling unit and shall be suitable for direct installation inside the conditioned area itself or within an AHU room. The unit shall have a discharge plenum with powder coated aluminium grille incase of units directly mounted inside the conditioned area. The finish of the unit shall be aesthetically appealing. The noise level of the unit shall not exceed 50 dBA at a distance of 1m from the filter side of the unit. The unit shall be with belt drive package and direct drive system is not acceptable. Provide the piping and valves within the AHU section. Wherever specified, provide water leakage sensors to monitor water leakage from units.



CENTRIFUGAL FANS

Fans shall be of centrifugal forward/backward curved type and it shall be of either double inlet double width or single inlet single width construction and either class I or II as per the tender specifications. The fan shall be complete with motor belt, drive, belt guard (for belt driven fans), base frame and vibration isolators. The casing shall be of minimum 2 mm thick sheet steel phosphated and then powder coated. The fan scroll shall be attached to the side plates by means of continuous lock seam or welded seam construction. Direction of rotation shall be marked on the housing. Fan wheels shall be statically and dynamically balanced. The fan shall be selected with optimum outlet velocity and better efficiency resulting in lower noise levels. The fan shaft shall be constructed out of C-45 steel, turned, ground and polished. Fan shaft shall be ball bearing type directly mounted on the fan housing. Bearings should be of heavy duty double row, self aligning ball/roller bearings with plummer block. Fan motor shall be of sufficient capacity to overcome the BHP, the frictional and drive losses. Fans shall be belt driven. Belt tension adjustment in the form of slide rails for motor shall be provided. Base shall be provided for each fan and shall be mounted on cushy foots. Test certificates shall be provided. If required, Consultants/ Owners may visualise the factory testing. The noise level shall not exceed 75 dBA at 1 m from the unit.

The motor shall be of TEFC squirrel cage type having class F insulation and IP 55 protection. The motor shall be of energy efficient type with high and flat efficiency curve for 50 to 100% load. Wherever specified provide twin motor with frame work so that incase of the failure of one motor the other can be put into operation. The motor shall be suitable for operation using a variable frequency drive. Provide external terminal box for cable termination as a part of the fan motor.

Wherever specified provide cabinet type airhandling units without cooling coils similar to the airhandling units for supply and exhaust applications. The specifications for airhandling units shall be applicable.

PROPELLER FANS

Propeller fans shall have MS powder coated or epoxy coated diaphragm. The impellers shall be die cast aluminium or MS powder coated epoxy coated with adequate gauge sheet. The fan shall be statically and dynamically balanced. The fan motor shall be suitable for outdoor installation and shall have minimum IP-55 protection. The fan shall be suitable for mounting vertically and should withstand higher temperatures. The fan shall be provided with bird screen and aluminium light gravity shutters as a part of the fan. The fan shall be suitable for single or three phase operation as specified in the tender conditions. Provide speed regulators as specified. The noise level of the fan shall not exceed 75 dBA at 1m from the fan.

CENTRIFUGAL TYPE INLINE FANS

The fans shall be of inline type powered by centrifugal fans. The fan shall be housed inside a GI duct casing with inspection door. The fan shall be suitable for mounting with the ducts. The fan shall be complete with single or three phase motor suitable for belt drive as specified. The fan shall have the minimum static pressure as required. Smaller fan meant for toilet exhaust shall be provided with high quality plasticised body having good aesthetics suitable for installation directly inside the room itself. Provide speed regulators for fans with direct drive. The noise level of the unit shall not exceed 55 dBA at1m from the unit.

VARIABLE SPEED DRIVES



The variable frequency drive shall be suitable for a main voltage of 1 phase 230 V +/- 10% or 3 phase 415 V +/- 10% and a frequency of 50% +/- 3%. The drive shall be complete with an IP 55 protection enclosure suitable for locking, incoming isolator, indication lamps, auto manual switch and a bypass starter duly wired at factory. The drive shall be provided with RFI/harmonic filters with less than 5 % (THD). The starting torque shall be 110% for 1 minute. The frequency range shall be 0 – 120 HZ/ 0 – 1000 HZ programmable. The drive shall withstand an ambient temperature of 45deg. C. The VFD shall be capable of receiving the current/voltage signal from variable airvolume units, pressure transducer or temperature transducers and control the motor speed. The unit shall be factory assembled and complete with programmable analog and digital inputs and outputs, overcurrent, overvoltage, undervoltage, overtemperature, earth fault protection, output short circuit protection, input phase loss, overload protection, stall protection. Data information shall be displayed on a 4 line alphanumerical display and shall be able to show continuously four operating data items such as frequency, speed, current, KW etc., and three operating modes. During programming all the information required for quickly and efficiently setting up the drive shall be shown. Indication lamps for voltage and alarm shall be provided apart from the display. The control unit shall be detachable and wherever required can be mounted at a distance not exceeding 3m from the drive.

The VFD shall be assembled inside an IP55 panel with bypass starter. The bypass starter shall be of stardelta type above 5.5 KW. Provide visual glass for monitoring the VFD control panel. The Panel shall be complete with incoming MCCB/ACB. The panel shall be provided with ventilation fans to prevent overheating of the components. The VFD and components shall be assembled properly with adequate space of maintenance. Provide connector strips for connecting the BAS cables. The drive shall be suitable for wall mounting or floor mounting. Incase of floor mounting suitable MS powder coated stand shall be included. Provide rubber mats in front of the drives.

The drive shall have the ASHRAE Bacnet or Modbus or Profibus or similar protocol and required hardware and software for hooking up the same with the building automation system.

11b. SHEET METAL WORK

1. All ducts shall be fabricated from either galvanised sheet steel conforming to IS: 277/92

having lock forming grade or Aluminium conforming to IS: 737. The coating of zinc shall conform to Class VIII. Only new, clean and bright sheets without watermarks shall be used. The Consultants/Owners reserve the right to reject the sheets not meeting the requirements.

2. The ducting shall be totally CNC machine made with ductmate type flanges or shall be fabricated using lock forming machines with angle iron flanges as specified.

CNC MACHINE MADE DUCTS WITH DUCTMATE TYPE FLANGES

3. The ducting shall be fabricated from coils. The thickness of the sheet for rectangular ducts shall be as follows:

-----------------------------------------------------------------------------------------------------------

MAXIMUM SIZE OF THE MINIMUM SHEET THICKNESS IN MM DUCT IN MM GSS ALUMINIUM

------------------------------------------------------------------------------------------------------------ 750 mm and below 0.63 0.80

751 mm to 1500 mm 0.80 1.00



1501 mm to 2250 mm 1.00 1.50 2251 mm and above 1.25 1.80

------------------------------------------------------------------------------------------------------------

4. The maximum length of each duct piece shall not exceed 1200 mm. Cut sheets shall not be used other than elbows or for ducts having a size bigger than factory available sheet size. All ducting shall be with ductmate type flanges and no C & SS joints will be acceptable. The slip on flanges shall be with roll formed GI sections. The corner pieces shall be suitable for inserting into the hollow web of the slip on flange. The slip on flange shall be fixed by clinching or by pop riveting so as to have a rigid joint. The spacing shall not exceed 150mm. Self tapping screws are not acceptable. Recessed groove shall be provided in the slip on flanges and corner plates for the proper seating of gaskets. The corner piece shall be secured by electro galvanized carriage bolts with flange nuts. The gaskets shall of self adhesive, microcellular, cross linked polyethylene foam type. The gaskets shall be non-toxic, permanently semi-soft and formulated for HVAC/Pharmaceutical/food grade applications. Wherever specified provide PVC or Neoprene gaskets.

5. The ducts shall be of medium pressure type having a pressure of 2000 pascals (Class II ducts) and the leakage shall be as per SMACNA/DW 143 standards)

6. The ducts shall be provided with cross breaking having a span not exceeding 400 mm.

7. The slip on flange shall have thickness of 0.6 mm for ducts up to a maximum size of 500 mm;

0.8 mm for ducts having a size between 501 mm and 750 mm; 1.0 mm for ducts having a size of 751 mm to 900 mm; 1.25 mm for ducts having a size of 901 mm to1200 mm and 1.5 mm for ducts having sizes higher than 1201 mm. The width of the flange shall be 29 mm for ducts having a maximum size of 750 mm and 39 mm for higher sizes. The duct section shall reach right upto the end of the slip on flange.

8. After installation of the slip on flange and corner plates, sealant shall be applied only at the

interface of the duct corner edge. Care shall be taken to ensure that corners complete clear the duct edges and the corner piece shall not sit on the duct corner edge.

9. The gaskets shall have width of 10 mm width and 4.5 mm thick for ducts having a pressure

class up to 500 pasclas. For a pressure class above 501 pascals, gaskets having a width of 15 mm and a thickness of 6 mm shall be used.

10. Care shall be taken to ensure that gasket is properly seated in the groove of the slip on flange

and corner plates in such a way that the gasket commence midway between the corner. The gasket shall be applied in one piece and joined at the starting point with a butt joint. The gasket has to cut over the corners in an arc, protruding slightly into the air stream at the corners.

11. The carriage bolt shall be tightened using a ratchet or a spanner. Longer duct lengths shall be aligned by passing a wire through the small round holes on the corner plates. Cleats shall be inserted over the slip on flanges on all the sides using a special crimping tool. The spacing between the cleats shall not exceed 150 mm.

12. The ducts shall be bolted directly on the top corner pieces with threaded rods anchored to

the ceiling using a bracket having a slot for minor lateral adjustments.



13. Wherever specified provide slotted channel/angle iron supports. The support rod shall be galvanized and fully threaded having a minimum diameter of 10 mm for duct size up to 750 mm and 12 mm for sizes above 751 mm. The anchor fasteners shall also be the same size of the rods. Wherever support rods require joints the smallest rod length shall not be less than 300 mm. The galvanized steel slotted rail shall have a thickness of 1.6 mm for ducts of size up to 750 mm and 2.4 mm for sizes above 751 mm but below 1500 mm. For sizes above 1501 mm use 40 x 40 x 5mm angles shall be used. The spacing between supports shall not exceed 2000mm for ducts having a maximum size of 1500 mm and 1200mm for higher sizes. Provide additional supports for bends, elbow, and collars as required. All civil work including drilling, chipping, grip bolting and other related works shall be within the scope of the air-conditioning contractor. Before drilling supports, alignment lines are to be marked on the ceiling to ensure that all the supports are in one line preferably using metal detectors trace the reinforcement bars on the slab. Care shall be taken not to drill on the tendons in the case of post tensioned structures.

14. The ducts shall be erected to the required levels after ascertaining the finished floor level

markings using water tubes. No ducts shall be raised or lowered in levels as a whole system. The ducts are to be dismantled incase the levels are to be changed. In such a case the gaskets are to be replaced.

15. Supports to be installed prior to the installation of the ducts. No temporary supports are

accepted and ducts supported to other services is not acceptable.

16. The entire duct including the insulation above the false ceiling shall be painted with Matt

finish black paint as a part of the duct works. Exposed ducts shall be painted with two coats of approved shade paint with zinc chromate primer.

17. Quality check forms are to be prepared during various stages of installation works. Ducts

without proper quality check forms will be rejected.

18. All ducts shall be supplied with the box sections from factory only.

19. All ducts are to be smoke tested after assembly in sections. Pressure testing shall be done for

select duct lengths as required by Consultants/owners. Insulation or painting of ducts shall be done only after such tests and after rectification of leaks. Test reports shall be submitted for such tests. Consultants/owners reserve the right to witness such tests.

RECTANGULAR DUCTING

20. Duct construction shall follow IS: 655. Thickness of sheets for rectangular duct shall be as follows:

-------------------------------------------------------------------------------------------------------------------- MAXIMUM SIZE OF THE MINIMUM SHEET THICKNESS IN MM

DUCT IN MM GSS ALUMINIUM --------------------------------------------------------------------------------------------------------------------

750 mm and below 0.63 0.80



751 mm to 1500 mm 0.80 1.00 1501 mm to 2250 mm 1.00 1.50 2251 mm and above 1.25 1.80

--------------------------------------------------------------------------------------------------------------------

21. The fabrication of the ducting including details of transverse joint connections, bracing, seams etc., for longitudinal joints etc., will be generally as per IS: 655. The ducts should be rigid and should have very minimum leakage. Use silicone sealant at suspected leak points. The ducts shall be of medium pressure type having a pressure of 2000 pascals (Class II ducts) and the leakage shall be as per SMACNA/DW 143 standards)

22. Only angle iron flanges shall be used for all transverse joints and GS sheet flanges are not

acceptable. Following shall be the type of transverse joint and bracing for rectangular ducts:

--------------------------------------------------------------------------------------------------------------------- Maximum duct size (mm) Type of transverse joint connection Bracing ---------------------------------------------------------------------------------------------------------------------

Up to 300 mm 25 x 25 x 3 mm thick angles None 301 to 750 mm 25 x 25 x 3 mm thick angles 25 x 25 x 3 mm angles

1.2 m from joint 751 to1500 mm 40 x 40 x 3 mm thick angles 40 x 40 x 3 mm angles

1.2 m from joint 1501 to 2250 mm 40 x 40 x 3 mm thick angles 40 x 40 x 3 mm angles

0.6 m from joint 2251 and above 50 x 50 x 3 mm thick angles 40 x 40 x 3 mm angles

0.6 mm from joint ---------------------------------------------------------------------------------------------------------------------

23. GS sheet flanges are not acceptable. Stiffening angles shall be fixed to the sides of the duct

by riveting. Flanges shall be welded at corners first and then riveted to duct. All ducts shall be provided with cross breaking on the sheets for stiffening irrespective of their sizes. All angles, rods and other MS members, materials, components etc., used for supports shall be provided with a coat of zinc chromate primer and black paint during supply followed by a final coat of black paint after erection along with the ducting.

24. Silicone sealant shall be applied at angle iron flange/sheet corners or at places where places where there is a leakage. No metal putty/paste shall be used.

25. Provide slotted channel/angle iron supports with threaded rods. The support rod shall be galvanised and fully threaded having a minimum diameter of 10 mm for duct size up to 750 mm and 12 mm for sizes above 751 mm. The anchor fasteners shall also be the same size of the rods. Wherever support rods require joints the smallest rod length shall not be less than 300 mm. The galvanised steel slotted rail shall have a thickness of 1.6 mm for ducts of size up to 750 mm and 2.4 mm for sizes above 751 mm but below 1500 mm. For sizes above 1501 mm use 40 x 40 x 5mm angles shall be used. The spacing between supports shall not exceed 2000mm for ducts having a maximum size of 1500 mm and 1200mm for higher sizes. Provide additional supports for bends, elbow, collars as required. All civil work including drilling, chipping, grip bolting and other related works shall be within the scope of the air-conditioning contractor. Before drilling supports, alignment lines are to be marked on the ceiling to ensure that all the supports are in one line preferably using metal detectors trace the reinforcement bars on the slab. Care shall be taken not to drill on the tendons in the case of post tensioned structures.

26. Elbows are to be provided with vanes.



27. 3mm thick rubber gaskets are to be used. The gaskets shall be butt joined and shall not sit over the other or there shall be a gap between two gaskets.

28. The ducts shall be erected to the required levels after ascertaining the finished floor level

markings using water tubes. No ducts shall be raised or lowered in levels as a whole system. The ducts are to be dismantled incase the levels are to be changed. In such a case the gaskets are to be replaced.

29. Supports to be installed prior to the installation of the ducts. No temporary supports or

ducts supported to other services is acceptable.

30. The entire duct including the insulation above the false ceiling shall be painted with Matt

finish black paint as a part of the duct works. Exposed ducts shall be painted with two coats of approved shade paint with zinc chromate primer.

31. Quality check forms are to be prepared during various stages of installation works. Ducts

without proper quality check forms will be rejected.

32. All ducts are to be smoke tested after assembly in sections. Pressure testing shall be done for

select duct lengths as required by Consultants/owners. Insulation or painting of ducts shall be done only after such tests and after rectification of leaks. Test reports shall be submitted for such tests. Consultants/owners reserve the right to witness such tests.

ROUND DUCTS

33. The thickness of sheet metal used for round ducting shall be as follows:

DIAMETER OF DUCT IN MM THICKNESS OF SHEET IN MM GI ALUMINIUM -------------------------------------------------------------------------------------------

150 to 500 0.63 0.80 501 to 750 0.80 1.00 751 to 1000 0.80 1.00 1001 to 1250 1.00 1.25 1251 and above 1.25 1.25 -------------------------------------------------------------------------------------------

34. All joints both circumferential and longitudinal shall be fabricated using grooved seam joints of appropriate type. Circumferential joints between the duct pieces shall incorporate flanges fabricated out of 3 mm thick MS plate.

35. Bends shall be a minimum of 2 gauges heavier than ducts of straight length of equal

diameter. They shall have a radius ratio of not less than 1.5, unless restricted by site conditions.

36. Bends of smooth construction are preferred. The bends shall have multiple sections of

atleast 5 in numbers. In case of taper pieces, the taper shall not be sharper than 1 in 5.

37. The supports for the round ducts shall be galvanized factory made type with threaded rods

and flat bands.



SPIRAL DUCTS

38. Spiral ducts shall be fabricated out of minimum 0.8 mm thick galvanised steel sheets for

ducts having a diameter upto 900mm. For higher sizes use 1 mm thick sheets. Only factory made fittings are acceptable. All duct supports for spiral ducts shall be factory made with galvanised steel fully threaded rods and flat bands. Ducts wherever specified shall be provided with 25/50 mm fibre glass insulation sandwiched between the outer casing and perforated/plain inside casing. The inside casing sheet shall have a thickness of 0.63 mm for duct sizes upto 900mm and 0.8 mm thick for higher sizes. The exposed ducts shall be treated with etch primer and painted with 2 coats of approved shade paint by a machine. Hand painting is not acceptable.

39. Wherever specified provide flat oval spiral duct.

40. Care shall be taken not to expose the fiberglass while cutting collars.

AIR PLENUMS

41. Air plenums shall be modular in construction with powder coated aluminum frame work and

double skin panels of 25 mm thick with fibre glass insulation similar to the air handling unit casing. The panels shall be powder coated and finished to the shade as that of the air handling unit. The panels shall be fabricated out of 0.8 mm thick outer sheet duly powder coated and the inner sheet shall be perforated having a thickness of 0.63 mm thick having minimum 30% perforations shall be used to perform the acoustic functions. Wherever specified, provide plain sheet having a thickness of 0.63 mm on the inside. For filter plenums provide plain sheet on the inside. The fibreglass shall be covered using RP tissue to prevent from flying into the air stream. The plenum shall be provided with factory cutouts for connection to the ducts and to the air handling unit. No site cutting is allowed. Necessary access door shall be provided. The plenum shall be hung from the ceiling using factory made supports using threaded rods having a thickness of 15 mm/12 mm rods depending on the size of the plenum. Wherever specified, provide plenums fabricated out of 1.5 mm thick stainless steel of SS304 grade.

42. Inspection doors shall be provided to permit access to heater boxes, filters etc., on the

plenums as required.

43. Supply diffuser plenums shall be factory fabricated with 0.8 mm thick sheets with round

collars. The plenum shall be supported using chains and J hooks. Flexible ducts shall be connected using worm clamps. The diffuser plenum with worm drive and chain will be measured as a part of the ducting. Plenums will be painted with black paint on the inside and outside.

ELECTRICAL HEATERS



44. The electrical heaters shall be of finned type and shall be of low temperature / black heat operation and totally enclosed type fitted with radiation fins. A removal panel for access to the heaters shall be provided in the duct plenum. The inside casing of the plenum shall be with a plain sheet. Any holes in the plenum for electrical wiring must be provided with suitable bushes to avoid air leakage. 6 mm thick hylam board lining shall be provided all around on the inside the plenum for a distance of 300 mm on each side of the heaters. A manually reset thermostat shall be provided near the plenum having heaters. In addition, the heaters must be electrically interlocked with the corresponding airhandling unit. The heaters shall be distributed uniformly for all the three phases.

FLEXIBLE DUCTS

45. Flexible ducts shall be used for connecting the supply diffuser and exhaust diffuser plenum to

the ducting. A double lamination of tough polyester shall encapsulate a steel helix to form an air tight inner core. The double layer core shall be wrapped in a thick blanket of fiberglass insulation and sheathed in a rugged and durable tri-directionally reinforced metalized polyester jacket. The insulation shall have a thickness of 25/50 mm as specified. The ducts shall be complete with accessories such as saddle straps for supports and worm drive clips for termination to the rigid metallic duct collars. Longer flexible lengths exceeding 1500 mm connecting the plenums and ducts are not acceptable.

46. Single skin aluminum flexible ducts shall be made of a triple lamination of aluminum foil,

polyester and metalized polyester film permanently bonded to a coated spring steel wire helix.

47. The PVC flexible ducts shall be of fire retardant type. PVC flexible ducts shall be used for

connecting the toilet exhaust plenums to the ducts or connecting the exhaust ducts in the case of laboratories. The ducts shall have pressure rating of 1500 Pascal.

VOLUME CONTROL DAMPERS

48. The volume control dampers shall be of opposed blade type for throttling and parallel acting

blades for isolation. The volume control damper shall be fabricated out of extruded aluminum frame having a size of 110 mm x 40 mm x 1.5 mm thick sections. The blades shall be of aluminum aerofoil double skin type having a size of 100 x 15 x 1.5 mm thick section with ribs on both sides to hold EPDM gaskets. The blades shall be held together by aluminum square sections pivoted to the outer frame by means of PVC bushes. The linkage will be by means of nylon/PVC gears. The outer frame shall be provided with a stainless steel sheet all-around to prevent air leakage. A GI quadrant handle shall be fixed on one side with a marking of the open/ part, open and close positions with a locking screw. The damper shall also be suitable for connecting to an motorized actuator. MS/CRCA dampers are not acceptable. The dampers for motorized operation shall require lesser torque. A limit switch is possible to be fixed onto the damper to ascertain the open/close position of the damper.

49. Single blade round balancing damper shall have a 1.5 mm thick GI frame with 1 mm thick

blades formed out of Galvanized sheets for sizes up to 450 mm and 1. 5 mm thick for sizes up to 600 mm. The damper shall be complete with square plated steel hub with lanced retainers to have minimal air leakage. The damper shall be provided with nylon bearings and manual locking quadrant.

FIRE DAMPERS



50. Dampers shall be fabricated out of 1.6 mm thick galvanized sheet. The blades shall also be

fabricated out of 1.6 mm thick formed sections with plated solid steel stubs with permanently sealed bronze bearings. The dampers shall be suitable for 90 minutes fire rating and shall comply with UL rating. The fire damper shall be of motorized spring return type with complete with temperature sensor and control panel. Provision shall be made for fixing a limit switch to monitor the position of the damper wherever specified. The fire damper shall be able to receive an external signal from the fire detection system for closure apart from the temperature sensor. The fire dampers shall have 0 leakages.

51. Duct connections to the air handling unit at expansion joints shall be with Metal to Fabric to

metal flexible duct connectors. The fabric shall be of fiberglass weave with silicon rubber coating or PVC The duct connection shall be of fire retardant type and shall be provided with a zip.

52. Cross talk silencers shall be fabricated out of 0.63 mm thick duct having an L profile with

acoustic insulation. The cross talk silencer will be supported by threaded rods. The cross talk silencer will be measured as a part of ducting.

53. Ratproofing, consisting of 1.5 mm thick GSS mesh shall be provided for all open ducts,

dampers, fan outlets and return air slits as a part of ducting/dampers/louvers. Mosquito proof net fabricated out of stainless steel mesh construction shall be provided at the outdoor air intake louvers/grilles wherever specified.

54. Where sheet metal ducts or sleeves terminate in wood work/MS frame work, masonry wall,

tight joints shall be made by means of closely fitting heavy angle iron flanged collars.

55. All ducts shall be totally free from vibration under all conditions of operation. For special

applications mount the ducts on saddles coated with rubber.

56. Ducts erected/kept in site for erection shall be sealed at the open ends using polythene

sheet after fabrication and erection. All ducts shall be cleaned thoroughly on the inside and outside before being erected/commissioned. All ducts shall carry the duct reference nos. for inspection visible from the bottom of the duct.

SOUND ATTENUATORS

57. The duct sound attenuators shall be factory fabricated with 1.25 mm thick GS sheets or one

gauge higher than the standard duct. The flanges shall be of angle iron type. The insulation material used shall be of fiberglass having a density of 25 kg/cum. Only slabs shall be used and loose pieces shall not be used. The louvers in the sound attenuators shall be fabricated using 0.8 mm thick perforated aluminum sheet having a thickness as specified in the drawing and filled with fiber glass. The fiberglass shall be covered with RP tissue on all the sides. The internal duct surface shall also be lined with 25 mm thick fiber glass and finished with perforated aluminum sheet having a thickness of 0.8 mm. The louvers shall be secured properly with the specified spacing using a proper fixing arrangement. Provide reinforcement members to prevent the perforated aluminum sheet from sagging. Sound attenuators shall offer minimum resistance to airflow. The attenuators are to be inspected at the factory by the consultants/owners if required before dispatch to site. Provide selection and test certificates wherever required.



AIR TERMINALS

58. All air outlets and intakes and accessories shall be constructed from extruded aluminum

powder coated sections as indicated in the tender schedules. The air terminals shall be finished with the approved shade powder coating.

59. The supply and return air diffusers shall be fabricated using extruded aluminum frame having a thickness of 1.2 mm with removable core. The core shall be preferably with single pressed sheet held together with aluminum pipes and aluminum tubes to hold the removable core to the outer frame. Provide perforated diffuser plates for laboratory application. The perforated sheet shall have a thickness of 1.2 mm with minimum 70% perforations. The diffuser shall be provided with opposed blade type collar dampers. Te opposed collar blade damper shall be fabricated out of all aluminum extrusions with black powder coating. The damper shall be suitable for adjustment through the perforated sheet in case of perforated dampers. All diffusers to be mounted on grid false ceiling shall be with tegular flanges.

60. The continuous grilles shall be with extruded aluminum profiles with 20 x 16 x 1.2 mm thick frame. The louvers shall have a profile thickness of 5 mm at the front and 2 mm at the rear. The louvers shall be spaced having a centre to centre distance of 12 mm with black aluminum space bushes. The grilles shall be have a cleat for fixing on to the false ceiling. No screws shall be fixed on the frame. The louvers shall be provided with required angle of deflection as specified in the tender schedules. The grilles shall be preferable a single piece for lengths up to 3500 mm with end flanges. Wherever cut sections are used end flanges, end flanges shall be provided having a length not lesser than 600 mm. Provide curved profiled grilles by ascertaining the site measurements. For grilles on round/spiral ducts provide curved frames to have a flush seating on the ducts.

61. Framed supply and exhaust grilles shall be with extruded aluminum profiles having a size of

20 x 16 x 1.2 mm thick The louvers shall have a profile thickness of 5 mm at the front and 2 mm at the rear having a spacing of 12 mm with black aluminum bushes. Provide collar dampers as specified.

62. Provide non-vision type fresh air grilles of powder coated aluminum for drawing fresh air louvers wherever specified suitable for fixing on to the windows/ventilators. The louvers shall be with mosquito net.

63. Linear slot diffusers shall be fabricated out of 20 x 60 1.2 mm extruded aluminum frame with internal T frame with black powder coated diffuser blade which shall slide into the frames and is adjustable to achieve the desired flow. These shall be held together by means of 8mm dia aluminum pipes and 20 x 20 x 1.2 mm thick square tubes and shall be riveted using aluminum rivets.

64. Floor grilles shall be fabricated out of adequate thickness aluminum extruded sections

suitable for taking the load of the equipments and people. The grilles shall be complete with damper for throttling.

65. Jet diffusers shall be fabricated of aluminum sheet having a thickness of 1.2 mm complete

with aluminum spinning’s supported on the flange assembly which can be fixed to the duct collar. The nozzle shall of rotatable type. The diffuser shall be power coated.

66. Diffuser spigots shall be suitable for installing below the ducts with flexible duct connection.

The spigot shall be complete with diffuser and shall have a height not exceeding 150 mm.



The spigot shall be fabricated out of GSS/Aluminum having a thickness of 1 mm and 1.,2 mm respectively.

67. Contractor shall submit samples of all the approved makes mentioned in the tender. The

make approved by the Owners/Consultants/Architects shall only be used. Incase of a change in make during the execution as compared to the one proposed to the tender stage, no extra price shall be paid for the makes approved during execution stage. A sample of each type of air outlet or intake that will be used during the job shall be kept at the site.

68. Provide diaphragm type (IRIS) dampers with flow measuring port for ventilated reagent

shelves and other general purpose exhaust applications for laboratories.

69. Location of air outlets shall be as shown in the drawings and frames shall be used for/ fixing

the grilles. Necessary frames for fixing of air terminals shall be co-ordinated with interior agencies.

70. During erection, ducts shall be covered with polythene sheet or waste sheets at open ends to

prevent ingress of dust/debris inside.

71. After installation of the entire ducts, the ducts shall be tested for leaks. The entire

distribution system shall be then balanced using a velometer. Measured air quantities shall be within 5% of the specified air quantities. Dampers shall be permanently marked after air balancing is completed so that these can be restored to their correct position if disturbed at any point of time. Smoke test for testing the leakage shall also be performed for supply air ducts. Consultants from time to time during erection may call for leak tests.

72. Contractors shall maintain quality check forms as per the tender formats. Ducts shall be

identified by areas and duct numbers in the quality check forms. Ducts not finding place in the quality check form may be summarily rejected.

11c. PIPES AND VALVES

PIPING :



1. The section lays down the general requirements for design, supply, installation and testing of piping involved in this project.

WATER PIPING

2. All chilled water, condenser water and condensate drain piping upto 300mm dia shall be of

medium class black steel conforming to IS:1239. All pipe joints shall be welded while screwed joints shall be used for smaller sizes. Pipe flanges shall conform to IS:1536 whereas the threads shall conform to IS:554. Pipes above 300mm but below 600mm dia shall be fabricated using 8mm thick MS plates of thickness.

3. The ends of pipe lengths to be welded shall be cut square by a machine saw and the edges leveled to form a “V” groove before welding. Under no circumstances, the edges shall be formed by gas cutting or welding.

4. The pipe weld shall be subjected to Radiographic/Die penetration test for minimum 10% of

the welded joints.

5. Weld on flanges shall be as per IS:6392 and may be steel welding neck type or slip on type

welded to the pipes. Flanges may be tack welded in position but all other welding shall be done with the joint dismantled. Gaskets of 3 mm thick 3 ply rubber shall be used with flanged joints.

6. The screwed flanges shall also conform to IS:6392 and shall be screwed to the pipes. Gasket

of 3 mm thick 3 ply rubber shall be used.

VALVES :

BUTTERFLY VALVES

7. Wherever specified butterfly valves shall be used for hot water, chilled water and condenser

water services. The butterfly valve shall be supplied along with flow control lever. The valves shall be compact in size and shall conform to BS 5155, MSS SP 67 and API 609. The valves shall be light in weight and easy to install. The body shall of High duty cast iron conforming to IS:210 and the seating shall be of Resilient black, Nitrile rubber moulded on to the body. The disk shall be of SG iron nylon coated, whereas the shaft shall be of stainless steel A ISI 431 treated permanently for lubrication. The shaft seals shall be of Nitrile ‘O’ rings and rubber seals. Valves shall be suitable for a working pressure of 16.5 KSC. Care should be taken during installation to see that the disk is not damaged during installation due to the flanges being incorrectly spaced. Provide gear operated valves for sizes having 300 mm and above. For smaller sizes such as 40 mm and below diaphragm type valves are acceptable.

CHECK VALVES

8. Check valves for smaller sizes shall be of swing type of gun metal construction. Lift type check valves shall be used for horizontal lines. Wafer type plate check valves shall be used for



bigger sizes as shown in the specifications. The check valves shall be suitable for 10.5 KSC test pressure.

STRAINERS

9. Strainers shall be preferably of approved “Y” type or pot type as specified in the tender

schedule with Cast iron or fabricated steel bodies. Strainers upto 50 mm shall be of gun metal type. Strainers shall have a removable bronze/stainless steel screen with 3 mm perforations and permanent magnet. Strainers shall be provided with flanges. They shall be designed so as to enable blowing out accumulated dirt and facilitate removal and replacement of all screen without disconnection from the main pipe. Strainers shall be provided with isolating valves so that they may be cleaned without draining the entire system.

BALANCING VALVES

10. Balancing valves shall be provided for water flow measurement as called in the tender

schedules. They shall have built in pressure drop measuring facility and shall have tamper proof setting with hand wheel or lock shield. Gun metal valves shall be used up to 40mm diameter and CI for higher sizes. The maximum operating pressure shall be 20 bar and maximum operating flow temperature shall be 200 deg. C. They shall be supplied with suitable manometer. Wherever specified use balancing valves suitable for electronic balancing.

11. Sufficient number of flanges and unions shall be provided as required to facilitate

maintenance work once the piping is installed.

12. Piping shall be properly supported on or suspended from stands, clamps, roller hangers, etc., as required. The contractor shall adequately design all brackets, saddles, clamps and hangers and shall be responsible for their structural integrity. Each support shall be isolated from the support by means of anti-vibration springs or durable liner of neoprene rubber. Pipe supports shall be of steel and shall be painted with rust preventive paint and finish coated with synthetic enamel paint of approved colour. Only factory made supports with Galvanised fully threaded rods with bands are acceptable. The chilled water pipes shall be isolated from the bands by a rubber sheet. These rubber sheet bands shall not be removed from supports. Pipe supports on the terrace or exposed to weather shall be hot dip galvanised.

13. The spacing of pipe supports shall not be more than that as specified below:

---------------------------------------------------------------------- NOMINAL PIPE SIZE IN MM SPACING IN M ---------------------------------------------------------------------- Upto 25 mm 1.5 m 32 to 150 mm 2.5 m above 150 mm 3.0 m ----------------------------------------------------------------------

The GI support rods shall be 8 mm thick for pipes upto 50 mm dia, 10 mm for pipes from 65 mm to 125 mm dia and 12 mm for pipes 150 mm dia and above.

14. Extra supports shall be provided at bends and heavy fittings like valves/strainers to avoid

undue stresses on the pipes.

15. Suitably cut wooden second quality seasoned teak wood blocks shall used for resting the pipe on the supports wherever required.



16. Vertical risers shall be parallel to walls and column lines and shall be straight and plumb. Risers passing from floor to floor shall be supported at each floor by clamps or collars attached to pipe with a 12 mm thick rubber pad. Risers shall also have a suitable elbow or concrete pipe support at the lowest point.

17. Pipe sleeves of 50 mm larger diameter than the pipe shall be provided wherever pipes pass through the walls and the annular space filled with felt and finished with retaining rings. Insulated piping shall be supported in such a manner as not to put undue pressure on the insulation. 2mm thick sheet shall be provided between the insulation and clamps, saddle extending at least 10 mm on both sides of the clamps, saddles.

18. All welded bends shall be of 5 piece construction for pipe sizes 200 mm dia and for larger

pipes atleast 7 piece construction shall be provided.

19. Where pipes are laid under ground, the top of the pipes shall not be less than 750 mm from the ground. Buried pipes shall be covered by river sand cushion for a height not less than 150 mm from the top of the pipe. After pipes have been laid and top sand cushion provided, the trench shall be refilled with excavated soil and any extra soil shall be removed from the site of work by the contractor. RCC sleepers is in the scope of the air-conditioning contractor.

20. All piping work shall be carried out in a workman like manner causing minimum disturbance

to the existing services. Piping installation shall be carried out with vibration elimination fittings wherever required. While installing the pipes, adequate clearance shall be provided for insulation wherever insulation is called for.

21. Drains shall be provided at all low points in the piping system and shall be of the following

sizes: --------------------------------------------------------------------------- MAIN LINE SIZE IN MM DRAIN SIZE IN MM --------------------------------------------------------------------------- Upto 300 25 Over 300 40 ---------------------------------------------------------------------------

Drain shall be provided with gate valves of equal size but with rising spindle. Alternatively, ball valves shall be provided. Drain shall be piped through G.I. medium class pipe to the nearest drain or floor waste. Piping shall be pitched towards the drain points. Wherever specified, drain pipes for the ceiling suspended units and fan coil units shall be provided with water grade blue HDPE/PVC pipe with screwed joints. The joints shall be proper so that no water leaks over the false ceiling. The pipes shall be tested for leaks to a minimum pressure of 1 KSC before the false ceiling sheets are fixed.

22. Automatic Air vents shall be provided at all high points in the piping system for venting. Air

vents shall be of gun metal construction and of gate or ball types. Similarly drain valves shall be provided at all dirty legs. The size of the valves shall be 25 mm size for pipes upto 100 mm and 40 mm for sizes larger than 100 mm. Drain shall be closed with dummy caps to prevent accidental opening. Drain valves and air vents shall be a part of the piping.

PRESSURE GAUGES & THERMOMETERS

23. Bourdon type pressure gauges of minimum 100 mm dial and appropriate range complete

with valves shall be provided at the inlet and outlets of heat exchangers, and pumpsets. Provide needle type valve for isolation.



24. Thermometers shall be of direct reading industrial type of appropriate range. Thermometers

shall be installed in separable wells and shall be provided at the inlet and outlet of all heat exchangers.

EXPANSION TANKS

25. Expansion tank shall be of HDPE type having a capacity equal to 6% of the total water

content in the piping system including the heat exchanging equipments. The bottom of the tank shall be atleast 600 mm above the highest point of the piping system. The tank shall be complete with float valve, drain, overflow, gauge glass, make up connection and vent connection. Make up water termination will be provided by the customer/other agencies. It should be specifically noted that no isolation valve shall be provided between the expansion tank and water pipe line. Wherever specified provide automatic expansion tank. The expansion tank shall be sturdy in construction with prime quality steel duly epoxy coated on the inside and outside. There shall be complete separation between air and water by means of EPDM rubber bladders and there shall be no contact between water and metal tank components. The bladder shall be non-toxic and shall be replaceable. The bladder shall permit sufficient elasticity to permit full expansion inside the tank and ensure better performance and longer working life. Make up water connection to the expansion tank with non return valve, pressure reducing valve, isolating valve shall be done by others.

TESTING

26. All piping shall be tested to hydrostatic test pressure of atleast 1 1/2 times the maximum

operating pressure but not less than 7 KSC for a period of not less than 24 hours. All leaks and defects in joints and piping during the test shall be rectified and got approved. Ambient temperature shall also be recorded along with the pressure during the commencement and conclusion of the pressure tests. No pipe shall be welded with water inside the pipes. Piping repaired subsequent to the above pressure shall be retested in the same manner. Systems may be tested in sections and such sections shall be capped securely. Entire system shall then be retested. Noiseless circulation of water in the circuit should be achieved. If improper circulation due to air lock is found, it is the responsibility of the air-conditioning contractor to carry out all the rectification including opening and refinishing of floor, wall etc., Pressure gauges should be valved off during pressure testing. The air-conditioning contractor shall provide all materials, tools and instruments, services and labour required to perform the test and to remove the water resulting from cleaning and after testing.

27. The consultants and the owners shall be informed well in advance by the air-conditioning

contractor of his intention to test a section or sections of piping and all such tests shall be witnessed by the owners/consultants or their authorised representatives. Test certificates duly signed by the contractor and the owners/consultants shall be submitted by the contractor after completing the tests.

28. No insulation shall be applied to pipes unless the pressure testing is completed to the

satisfaction of the owners/consultants. Insulation shall be done as per the tender specifications.

29. After completion of the installation, the pipe lines are to be flushed thoroughly to blow out

all the dirt and muck. Commissioning strainers shall be used before all equipments. The system then shall be balanced to deliver the water quantities as specified. Balancing report after certification shall be submitted with completion drawings and documents.

30. Exposed Pipelines shall be provided with one coat of primer and 2 coats of paint of colour

and quality as specified. Insulated piping and valves shall also be provided with painting in a similar manner. Direction of flow shall be marked on pipelines in bold markings.



31. Provide automatic airvents at higher points. The body shall be of cast iron and the float and

leverage shall be of stainless steel. The operating pressure shall be 150 psig.

32. Provide expansion joints to prevent bending, bowing of pipes resulting in unusual stresses. The expansion joint shall be complete with anchor bases, inner liners, tie rods, outer jackets and flanges. The expansion joints shall be of stainless steel.

33. Provide flanged rubber bellows at pump, chiller inlets and outlets which are assumed to be

part of the equipments.

34. Condenser water piping shall be painted with two coats of enamel paint having apple green shade.

REFRIGERANT PIPING

1. Refrigerant piping shall be of hard drawn copper or Seamless MS of heavy class. Copper

pipes shall be used for hermetic/semihermetic compressors, whereas MS pipes shall be used for Open type compressors.

2. All pipes shall be new and clean. Pipes shall be flushed away from dirt/muck inside before

laying.

3. Copper pipes shall be brazed using brazing alloy of silver-copper-phosphorous type and shall be made by the flow of brazing alloy by capillary action along the annular space between the two mating surfaces. Jointing between two MS types or MS tube and fitting shall be done by electric welding. MS tubing shall be cut to form proper “V” at the mating ends before welding. Gas flame shall not be used for this purpose. Care should be taken to remove the burrs and dirt from the cut tube ends.

4. Refrigerant lines shall be designed properly to ensure proper oil return and should not cause

flashing of liquid refrigerant. The pipes shall be supported properly and it should be able to withstand the thermal stresses and vibrations encountered during normal operations.

5. Isolating valves shall be provided to isolate each compressor, strainers, sight glass and any

other component requiring proper operation and maintenance. The gauge connections shall be of soft drawn copper tubes of 6 mm dia and shall be through capped angle valves. Pressure gauges shall be provided for suction, discharge and oil lines of the compressor.

6. While installing the piping, adequate clearance shall be provided for insulation wherever insulation is called for.

7. The entire refrigerant piping shall be installed in a workmanship like manner, true to

alignment and grade as required. Tube ends shall be kept plugged or kept closed at all times before installation during construction to prevent ingress of moisture and foreign matters. Piping supports shall not be spaced more than 2 metres apart and substantial enough to prevent bending stresses. The pipes shall be supported on MS flat saddles and secured properly using clamps with rubber bands. Valves shall be supported separately to avoid transmission of stresses to connected pipes. Wherever specified, install the suction and liquid lines inside a rigid PVC pipe duly supported.

8. After installation, the pipe shall be pressure tested preferably with Dry nitrogen if with not

carbon-di-oxide with the following test pressures for Freon 22 systems: HIGH PRESSURE SIDE - 25 KSC LOW PRESSURE SIDE - 10.5 KSC



All joints shall be checked for leakages with soap solution. Leaks shall be marked, pressure released and rectified. System shall be recharged and tested till no leak exists. No measurable drop in pressure should be detected after pressure readings are adjusted for temperature charges. Pressure gauges and controls may be valved off duringpressure testing.

9. After pressure testing is completed, evacuation shall be carried out with a 2 stage rotary vane vacuum pump connected to both the low and high sides of the system. Vacuum pump shall be operated to reduce the pressure to 500 microns absolute and allowed to operate at this pressure for 6 hours. System shall then be isolated and allowed to stand for 6 hours. Vacuum then shall be broken with a mixture of dry nitrogen and a small quantity of refrigerant and revacuumised. The vacuum achieved shall be atleast as deep as 500 microns and shall be maintained for a period of atleast 24 hours after the vacuum pump has been shut off. If no leak exists, correct quantity of refrigerant shall be charged. Final leak detection shall be done by means of an electronic leak detector.

10. Insulation for the suction line shall be done after the plant has been run for about 48 hours.

11. Refrigerant lines then be given 2 coats of enamel paint of the following colours:

Discharge lines - Cherry Red Suction lines - Marine Blue Liquid lines - Pale Yellow

12. Pressure testing and vacuumising are required to be done in the presence of the consultants/owners or their authorised representatives. Test certificates shall be duly signed by he contractor and endorsed by the concerned.

Chemical Dosing System

The preliminary cleaning (water flushing) and chemical cleaning program shall be accomplished in the following stages:

Stage 1: The system will be first flushed with water about 2-3 times and then be subjected to chemical cleaning as under:

Stage 2 : The system will be cleaned by circulating alkaline solution with suitable wetting agent for about 3hrs and then heavily drained off from the lowest drain point and be flushed with water until the PH of the system water reaches around 7.5 to 8.2 (Around 8.0)

Then the system will be heavily drained from the lowest drain point and flushed with water until the system water reaches neutral PH i.e., 7.0.

Stage 3: Finally passivation shall be done by passing corrosion inhibitor cum deposit control agent designed for passivation as well as preventive treatment of the system.

Make up Water quality to be made available at site shall be as mentioned in the below table.



Turbidity PH TDS ppm

Chloride as CL ppm

P.Alk. as CaCo3 ppm

M.Alk. As

CaCo3

Total Hard as CaCo3

CaH As

CaCo3

Iron as Fe

ppm

< 05 NTU 7.0 to 8.0

< 150 < 100 0 < 80 < 80 < 50 < 0.2

Advantages of Chilled water treatment

A. Physical advantages

Completely inhibits corrosion and thereby rendering no metal loss in the loop.

Prevents puncturing of piping networks.

Evaporator tubes being very small in diameter clogging and choking of tubes is avoided.

B. Chemical advantages

Treatment controls the corrosion rate to the required range recommend

Due to the smooth surface rendered after treatment anodic and cathodic corrosion is eliminated.

Microbic induced corrosion namely iron reducing bacteria, sulphate reducing bacteria etc can never develop.

General Specifications: The dosing system for a chiller is done for the chilled water line (corrosion inhibitor) The Electronic Diaphragm type Chemical dosing system shall consist 1.No 50 Lit HDPE Tank & Dosing pump with First charge of Chemicals. The Electronic dosing pump shall operate on the power supply of 230V/1Ph for which a 3 pin socket will have to be provided in the nearest wall/column. The Chemical shall be dosed in the suction header of the Chilled water circuit where the pressure in the water line is less than 05Kg/Cm2.

The Dosing Quantity shall remain same even at different Voltages to ensure High Accuracy. The diaphragm shall be of high quality TEFLON.

11d. INSULATION WORK

1. The scope of this section comprises supply and application of insulation to sheet metal ducting, chilled water piping, condensate drain piping, refrigerant piping, insulation for airhandling units, chillers, insulation for walls and ceiling and floor.

2. TF quality expanded polystyrene shall have thermal conductivities not exceeding 0.029 K-cal hr/sq.m/deg.C/m at 20 deg. C and densities not less than 20 kg/cum. Expanded polystyrene shall be used for insulation to buried chilled water pipe lines and roof insulation wherever specified. The synthetic rubber insulation material if used shall have a density of around 60 to 100 Kg/Cum. having a thermal conductivity of 0.0340 W/M.deg. A at 20 deg. C shall be used. The insulation material wherever specified shall have a flame spread index of 25 or less as per ASTM. Synthetic rubber insulation shall be used for chilled water piping, duct insulation and roof insulation.

3. Resin bonded fibre glass mat is used for insulating the ducts inside the conditioned areas and shall have a density not less than 24 Kg/cum and a thermal conductivity not greater than 0.029 K-cal hr/sq.m/deg. C/m at 20 deg. C. Fibre glass shall be in the form of blankets incorporating factory laminated with 0.02mm thick aluminium foil on one side and fibre glass mat on the other side. Fibre glass insulation shall be used for duct acoustic and thermal insulation.



4. For pipe insulation pre-formed cylindrical pipe sections shall be used for smaller sizes. For higher sizes sheet insulation shall be used.

5. All insulation on equipment and piping shall be applied only after the system has been pressure tested satisfactorily.

6. The consultants/owners or their authorised representatives reserve the right to peruse the weights, dimensions etc., of the insulation material supplied. Samples of all insulation material specified in various forms shall be submitted by the successful contractor. The customers / consultants shall have the right to reject all supplies which do not conform to the specifications and to the samples so approved.

PIPE INSULATION

7. All buried chilled water piping shall be insulated with TF grade expanded polystyrene. Prior to application of insulation, all pipe work shall be cleaned on the surface with wire brush to remove dirt and dust. Apply a thick coat of bituminous primer uniformly over the surface. Bitumen used shall be R 85/25. High density insulation shall be inserted below the pipes between the RCC sleepers over a 1 mm thick GI sheet. Thermal insulation shall then be applied as per the following thickness taking care to see that circumferential joints are staggered longitudinally. The insulation shall have a thickness of 80 mm and a density of 20 kg.cum. Chicken wire mesh of 24G x 19mm hexagonal GI wire shall be wrapped around the insulation and two layers of smooth setting sand cement plaster each of 6mm thick shall be applied over the lath of wire mesh. The proportion of cement to sand shall not be less than 1:3. Curing to be done to the sand cement plastered surface. Cover the insulation with 6 mm thick Tar felt set in air blown grade bitumen.

8. Wherever synthetic preformed rubber insulation material is used for pipe sections use 13 mm thick material for pipes sizes upto 200 mm dia. For pipe sizes above 200 mm use 19 mm thick material. Use 25/32 mm thick insulation for pipes wherever specified. Only preformed sections shall be used for pipe sizes upto 50 mm. The joints shall be sealed properly using adhesive. Incase of drain pipes use 9mm thick preformed pipe sections. For refrigerant suction lines and chiller use 19 mm thick material. For drain pipes and branch pipes and valves near the ceiling suspended airhandling and fan coil units use synthetic foam material. Wherever specified cover the synthetic foam insulation with 1mm thick FRP/polyshield of approved shade.

9. For insulated pipes in the plant and airhandling unit rooms if called in the tender schedules, shall be covered with 0.6 mm thick commercial grade aluminium sheet cladding. The joints shall be formed with proper grooves and overlaps and secured in position with self tapping screws. For bends/elbows and such other fittings, the cladding shall be in multi-piece construction, the thickness of the sheet shall be 0.8mm.

DUCT INSULATION

SYNTHETIC RUBBER INSULATION



10. Supply air ducting exposed to atmosphere or in the non airconditioned area shall be insulated with 19mm thick synthetic rubber insulation. Ducts running in the return air path shall be insulated with 13 mm thick insulation. Wherever specified use the insulation with factory laminated aluminium foil. However thickness shall be calculated by the successful vendor and approval for the same shall be taken before proceeding the work.

11. Clean the surface of the duct with a wire brush to remove dirt and dust. Stick the insulation using water based adhesive. Wherever specified cover the insulation with 1 mm thick FRP mat or polyshield of approved shade.

12. For acoustic insulation of ducts use 13 mm thick insulation material having acoustic properties.

FIBRE GLASS INSULATION

13. Ducts running in return air path, shall be insulated with 25 mm thick resin bonded fibre glass with factory laminated aluminium foil. Ducts running in the non air-conditioned area shall be insulated with 50 mm thick Fibregalss with factory laminated aluminium foil. Clean the duct surface and apply a thick coat of bituminous primer. When the insulation is till tacky, apply the blanket of insulation material, so that it hugs the duct snugly. Seal all the joints using 75 mm wide self adhesive aluminium tape as specified. To further ensure that the insulation is laid tightly on the duct, wrap nylon packing strap around the duct at a spacing of not less than 600 mm along the length of the duct. Paint the insulation with black paint having matt finish.

14. Ducts identified in the tender schedule for acoustic lining shall be provided with 25 mm thick resin bonded fibre glass inside the ducts. Wrap the insulation with RP tissue and secure the same to the ducting using using GI bolts and nuts and plate and bitumin washers withh 24 G perforated aluminium sheet having atleast 60% perforations. Alternatively use pop up type saddled clamps. The clamps shall be fixed to the ducts by adhesive.

ROOF INSULATION

15. Exposed roof over the conditioned areas shall be insulated with 50 mm thick expanded polystyrene. For underdeck insulation in the conditioned area, the insulation shall of TF quality.

16. Underdeck insulation shall be done by fixing the TF quality Expanded polystyrene slabs by wire and washer method. Fix rawl plugs in a grid of 500mm x 500mm. Fix 24 G 19 mm hexagonal GI wire mesh over EPS rigidly using 24 G plate washers. Wherever specified use 13 mm thick synthetic foam.

17. Over deck insulation shall be done as follows: Clean the surface free from sand. Apply a thick coat of bitumen. When the bitumen is tacky fix the insulation. Seal the joints with bitumen. Fix one layer of 3mm thick tar felt by means of hot bitumen. A minimum 150mm overlap of tarfelt is required at joints. Apply two coats of sand cement plaster over the tarfelt. The proportion of cement to sand shall be atleast 1:3. Cure the plaster with water for two days.

18. Wherever specified used 15 mm thick Synthetic rubber insulation under the deck. The insulation shall be fixed to the roof after cleaning the surface and removing the PVC tapes if any using water based adhesive. The joints shall be sealed with adhesive tape.

AHU ROOM INSULATION



19. Acoustic insulation of the wall shall be done using 50 mm thick fibre glass wrapped on RP tissue. Fix aluminium/GI channel sections having a cross section of 50 x 25 mm forming a grid of 1000 x 500 mm. Clean the surface to remove all dirt and dust. Apply two coats of shalicote primer. Friction fit the fibre glass in the 1m x 0.5m. Cover the insulation with 24 G perforated aluminium sheet. The corners and junctions/terminations shall be covered with aluminium angles/flats/sections. Alternatively prefabricated panels shall be used and slided on to the frame. No wood shall be used.

20. For thermal insulation, fix plain aluminium sheets of 24G inlieu of perforated sheets.

CHILLER INSULATION

21. Evaporator of the chiller shall be insulated using 19 mm thick Synthetic rubber insulation using water based adhesive and finished with 1mm thick FRP or polyshield. Alternatively the chiller shall be covered with 24 G aluminium cladding over the insulation or use synthetic nitrile rubber insulation with factory laminated aluminium foil

PUMP/EQUIPMENT/TANK INSULATION

22. Chilled water pumps shall be insulated with 19 mm thick Synthetic rubber insulation. Cover the insulation with 24 G aluminum cladding or 1 mm thick FRP/Polyshiefld cladding. The specifications shall be followed for equipment/fan/tank insulation.

23. All pipe fittings and specialties such as valves, strainers etc., shall be insulated to the same thickness as that specified for pipes. Valve bonnets, yokes and spindles shall be so insulated as not to cause damage to the insulation when valve is used or serviced.

24. For acoustic insulation over metal false ceiling, cover 50 mm thick fibreglass with RP tissue on both sides, staple the ends and secure the same over the false ceiling using GI binding wires. For thermal insulation, cover the insulation with polythene sheet on both sides.

25. As far as the TF grade expanded polystyrene is concerned, contractors are required to check each and every piece for TF grade and mention the same in quality check form. The materials shall be checked at entry point at site and defective material if any shall be removed within 1 hour from the site. Any discrepancy found in this regard will call for the rejection of the entire insulation done at site including the damages for replacement caused by other services.

26. Refrigerant pipes shall be insulated with prefomed pipe sections having the adequate thickness.

27. Painting of approved colour shall be carried out over the insulated surfaces.

11e. CONTROLS & INSTRUMENTATION



1. The scope of this section comprises supply, installation, testing and commissioning of controls and instruments conforming to these specifications and in accordance with the requirements of the tender schedules.

TWO WAY MIXING/MOTORISED VALVES

2. These valves shall be provided for floor mounted air handling units installed in chilled water lines at each AHU. Each valve shall be actuated by a proportional thermostat. Constant space conditions shall be maintained by allowing correct quantity of chilled/hot water to pass through the coil. Valves shall be selected for a proper CV value. Valves shall have cast bronze body upto 40mm and GI body for higher sizes. All valves shall be designed for a body pressure of 10 KSC. The flow characteristics shall be linear for each port. The valves shall be compatible to hook up with direct digital control systems. Valves shall be actuated by actuators and linkages should be selected after ascertaining the torque requirements of the valves.

3. For fan coil units and ceiling suspended airhandling units 3 way motorised ON/OFF valve or 3 way solenoid valve suitable for operation with snap acting room thermostats shall be used.

PRESSURE SWITCHES/FLOW SWITCHES

4. Pressure switches/flow switches shall be provided in condenser and chilled water outlet as specified in the tender schedules. These switches shall prevent the compressor/pump from starting unless the cooling water flow/pressure is established in the condenser water and chilled water lines.

THERMOSTATS

5. Thermostats shall be electric two position snap action/proportional type. All thermostats shall be supplied with mounting boxes. Sample thermostats shall be supplied for site co-ordination.

6. Snap acting thermostats shall be provided for controlling temperature and humidity. The range and differential shall be adjustable. They shall be used for cooling and heating applications. In case of the sensing bulb is placed in return air path, the same shall be secured rigidly.

7. Room thermostats shall be used along with fan coil units and ceiling suspended air handling units. They shall have fixed differential of 2 deg. F. They shall have inbuilt speed selector switch and in the absence of it separate speed selector switch shall be provided.

8. Proportional thermostats having a throttling range of 2 deg.C shall be provided for controlling the room temperature/humidity. The thermostats shall work with a 3 way mixing valve and modutrol motor to maintain the room temperature. The sensing bulb placed in the return air path shall be secured rigidly.

9. Safety thermostats shall be provided near the heaters in air handling units to prevent the heaters from overheating, in case of no or lesser air flow.

HUMIDISTATS



10. Room humidity shall be controlled by a 2 position snap acting humidistat having a range of 20 to 90% and having a differential of 5%. The humidistat shall operate the reheat coil in case of rise in space humidity. Humidistat shall also energise room humidifier in case the humidity falls below the preset limits.

11. Proportional humidistats having similar ranges shall be used to actuate 3 way mixing valves as and when specified.

AIRSTATS

12. Airstats shall be provided in air handling units to prevent heaters from energising unless air flow has been established as when specified in the tender schedules.

INSTRUMENTS

Instruments required for different types of machines may be provided as per the requirements indicated in the tender schedules.

THERMOMETERS

13. Industrial Thermometers shall be mercury in glass type on steel casing. Thermometer shall be filled with red reading mercury. Thermometers shall be of separable socket type and shall have extended neck where required for insulated pipes. The scale shall be 23 cms long. Thermometer shall be installed as indicated in the tender schedules and in the schematic drawings. Range shall be 0 to 50 deg. C for air-conditioning applications and 0 to 100 deg. C for hot water applications. Wherever specified use 100 mm dia dial type thermometers.

PRESSURE GAUGES

14. Pressure gauges shall be of bourdon and dial type with a minimum diameter of 100mm. Suction side gauges of pump shall be of 0-75cm mercury vacuum and 0-4 KSC pressure. Gauges at other locations shall be of 0-5 KSC pressure. Gauge shall be fixed to a bend with an isolating valve.

ROOM THERMOMETERS/ RH INDICATORS

15. Room thermometers shall be dry and wet bulb type with mercury in glass construction. The thermometer shall have a range of 10 to 50 deg. C and shall be complete with water reservoir and wick mounted on an unbreakable plastic back and suitable for wall mounting. Humidity chart shall be supplied with the instrument. Relative humidity indicator shall be of dial type suitable for wall hanging. The range shall be from 10 to 90% RH.



MANOMETERS

16. Inclined tube manometers shall be installed across all filter banks to measure the pressure drop across the filters as and when specified in the tender schedules. The inclined vertical manometers shall have a range of 0 to 80 mm water column having an accuracy of 3% and suitable for a maximum internal working pressure of 0.7 KSC and maximum working temperature of 60 deg.C. The minimum graduations on the inclined tube shall be 0.25 mm water column between 0 to 10mm and 2.5 mm between 10mm and 80mm. The manometer shall be constructed out of virtually indestructible molded white styrene acrylonitrile housing indicating tube and fluid wells, moulded ABS knobs and zero adjusting plunger. Over flow tank shall be provided. Scales shall be lithograph printed on aluminium and epoxy coated. The manometer shall include two tubing connections for 3mm pipe or sheet metal ducts, two maintaining screws, indicating fluid and 2.5 m of flexible double colour plastic tube. The manometer shall use red coloured oil of 0.826 specific gravity.

17. All automatic controls and instruments shall be factory calibrated and provided with necessary instructions for site calibration and testing. Various items of same type shall be completely interchangeable and their accuracy shall be guaranteed by the manufacturer. All automatic controls and instruments shall be tested for accuracy and reliability before commissioning the air-conditioning system.

11f. MEASUREMENTS

The procedures to be followed for measurement of variable items shall be as follow:

DUCTING & DUCT INSULATION

1. Ducting shall be measured on the external surface. The rate per sq.mt of external surface shall include flanges, gaskets, bolts and nuts, duct supports, hangers, anchor fasteners, vanes, access doors and painting. Duct measurements shall be taken before the insulation is applied. Duct measurements shall be taken well before the installation of the false ceiling grids.

2. Duct insulation will be same as the area of the uninsulated ducts.

3. Grilles and dampers shall be measured on cross sectional area basis excluding flanges.

PIPING & PIPE INSULATION

4. Pipes shall be measured on linear basis and shall include all fittings, flanges, unions, gaskets for joints, bolts and nuts, pipe supports, vibration isolators, flexible connections, excavation and refilling of earth, painting of pipes etc., Flexible bellows for equipments will not be taken into account for measurements.

5. Insulation shall also be measured on linear basis and shall include all fittings as mentioned above and shall be same as the pipe measurements.

6. Valves and strainers shall be measured on unit basis.



CABLING & CABLE TRAYS

7. Cabling shall be measured on linear basis from gland to gland and shall include the excavation and refilling of the earth, sand cushioning etc.

8. The end terminations are measured on unit basis.

9. Cable trays are measured on the basis of linear basis which includes supports, clamps, grouting etc.



12. DRAWING LIST

SL.

NO.

SHEET

NO DRAWING DETAILS

I

s

s

u

e

d

Tender

I

s

s

u

e

d

GFC

I

s

s

u

e

d

Remarks

1 McD-HVAC-101 Standard Legends & Notes

2 McD-HVAC-103 HVAC layout for Ground floor

3 McD-HVAC-104 HVAC layout for First floor

4 McD-HVAC-105 HVAC layout for Second floor

5 McD-HVAC-106 HVAC layout for Third Floor

6 McD-HVAC-107 HVAC layout for Terrace Floor

7 McD-HVAC-102 GENERAL FIXING DETAILS



13. EQUIPMENT SCHEDULE

WATER-COOLED CHILLING MACHINE - SCREW TYPE

Actual capacity per machine 125 TR

No. of machine 2 Nos.

Refrigerant HFC134a

COMPRESSOR

Compressor capacity 125 TR

No. of compressors/machine Minimum Two

Compressor type Screw type

Condensing temperature 98 Deg. F

Type of starter Soft starter

C O P Not Less than 5.6

CONDENSER

Nominal Capacity 125 TR

Type of condenser Shell and tube

Water entry temperature 88 Deg. F

Water flow 375 GPM

Fouling factor ( hr-ft2-deg F/Btu) 0.00025

Material of tubes Copper

Material of fins Integral fins

Condensing temperature 98 Deg. F

CHILLER

Capacity of chiller 125 TR



No. of chiller per machine One

No. of circuits/chiller Multiple

Type of chiller Flooded

Entering water temperature 54 deg F

Leaving water temperature 44 deg F

Fouling factor ( hr-ft2-deg F/Btu) 0.0001

Water flow 300 GPM

Noise level dBA 70 dBA from 1mt from the chiller

Type of controls

Microprocessor based plant manger with

power and capacity evaluation and

logging as per specifications, BMS

Compatabile

Type of control

Microprocessor based plant Manager with

BACNET/Modbus protocol

INDUCED DRAFT FRP COOLING

TOWER

Type Counter flow

Capacity(Heat Rejection) 125 TR(Chiller)

Quantity 2 Nos.

Material of the tower

Fibreglass with fire

retardant resin

Ambient wet bulb temperature 85 deg. F

Water entering temperature 98 deg. F

Water leaving temperature 88 deg. F



Approach 5 Deg F

Water flow 375 GPM

Noise level dBA

70 dBA from 1mt

from the tower

Type of fan Propeller

Type of motor

TEFC sq.cage/

EFF1

Type of protection IP 55

Class of motor Class F

Speed Constant

Drift loss

Not exceeding

0.005%

Material of fill, louver, eliminator

PVC self

extinguishing type

with flame spread

index 25 or less

Material of fasteners Stainless steel

Ladder, vibration switch, cushy To be included

foot mounts

Variable frequency drive NA

Eliminators

material shall be

PVC, & maximum

0.005% drift rate

CHILLED WATER PUMPSETS

Chilled water

pumpsets

Secondary chw

pumpsets

Condenser water

pumpsets

Type of pumpsets

Centrifugal pump

End suction

Centrifugal pump

End suction with

Variable speed

drive

Centrifugal pump

End suction

No. of pumpsets 2+1 Nos. 2+1 Nos 2 + 1 Nos.

(1no standby) (1no standby) ( 1 No. standby)



Delivery gpm 300 GPM 300 GPM 375 GPM

Head 10 m 20 m 20 m

Pump motor 5.5 kw 7.5 Kw 7.5 Kw

Pump/Motor speed 1450 rpm 1450 rpm 1450 rpm

Type of impeller Bronze Bronze Bronze

Type of seal Mechanical Mechanical Mechanical

Type of control Star Delta Starter

Variable speed

drive Star Delta Starter

Minimum Efficiency 75% 75% 75%

FLOOR MOUNTED AIRHANDLING

UNITS:

17 TR/7000 CFM 14 TR/7000 CFM 12 TR/5000 CFM

No. of units 1 No. 1 No. 1 No.

Type of unit Floor mounted Floor mounted Floor mounted

Type of fan

Centrifugal

backward

Centrifugal

backward

Centrifugal

backward

Type of discharge Vertical Vertical Vertical

Type of casing

Double skin

modular

Double skin

modular Double skin modular

Material of casing

GI/MS powder

coated

GI/MS powder

coated

GI/MS powder

coated

Type of construction Modular Modular Modular

Air quantity (CFM) 7000 7000 5000

Capacity (TR) 17 TR 14 TR 12 TR

No. of rows 6 6 6

ADP 56 Deg F 56 Deg F 54 Deg F

Entering water temp deg.C 44 Deg F 44 Deg F 44 Deg F



Leaving water temp deg.C 54 Deg F 54 Deg F 54 Deg F

Water flow (lpm) 155 lpm 127 lpm 109 lpm

Fan static pressure 65 mm WG 125 mm WG 65 mm WG

Coil face velocity

Not to exceed

350 fpm

Not to exceed 350

fpm

Not to exceed 350

fpm

Type of fan motor TEFC Sq. cage TEFC Sq. cage TEFC Sq. cage

Type of protection IP 55 IP 55 IP 55

Type of insulation Class F Class F Class F

Type of Pre filters HDPE filter HDPE filter HDPE filter

Commissioning filters To be included To be included To be included

Fine filter To be included To be included To be included

HEPA filter NA NA NA

Variable frequency drive unit Required Required Required

Mixing Chamber Required Required Required

CEILING SUSPENDED

AIRHANDLING UNITS

15 TR/5000 CFM 10TR/4000 CFM 7.5 TR/2000 CFM

No. of units 1 Nos. 12 Nos. 6 Nos.

Type of unit

Ceiling

suspended Ceiling suspended Ceiling suspended

Type of fan Forward curved Forward curved Forward curved

Type of discharge Horizontal Horizontal Horizontal

Type of casing

Double skin

modular

Double skin


Material of casing

GI/MS powder

coated

GI/MS powder

coated

GI/MS powder

coated




Air quantity (cfm) 5000 4000 3000

Capacity (TR) 15 TR 10 TR 7.5 TR

No. of rows 6 Row 4/6 Row 4/6 Row




Water flow (lpm) 136 lpm 91 lpm 68 lpm


Coil face velocity

Not to exceed

350 fpm

Not to exceed 350

fpm

Not to exceed 350

fpm




Type of Rough filters HDPE filter HDPE filter HDPE filter


CEILING SUSPENDED

AIRHANDLING UNITS

5 TR/2000 CFM 3 TR/1200 CFM 2.5 TR/1000 CFM

No. of units 3 Nos. 4 Nos 4 Nos

Type of unit

Ceiling

suspended Ceiling suspended Ceiling suspended

Type of fan Forward curved Forward curved Forward curved

Type of discharge Horizontal Horizontal Horizontal

Type of casing

Double skin

modular

Double skin


Material of casing GI/MS powder GI/MS powder GI/MS powder



coated coated coated


Air quantity (cfm) 2000 Cfm 1200 Cfm 1000 Cfm

Capacity (TR) 5 TR 3 TR 2.5 TR

No. of rows 4/6 Row 4 4




Water flow (lpm) 45 lpm 27 Lpm 27 Lpm


Coil face velocity

Not to exceed

350 fpm

Not to exceed 350

fpm

Not to exceed 350

fpm




Type of Rough filters HDPE filter HDPE filter HDPE filter


FAN COIL UNIT

1 TR/350 CFM -

FCU

No. of units 5 Nos.

Type of unit Fan Coil Unit

Type of fan Forward curved

Type of discharge Horizontal



Type of casing

Double skin

modular

Material of casing

GI/MS powder

coated

Type of construction Modular

Air quantity (cfm) 350 Cfm

Capacity (TR) 1 TR

No. of rows 4

ADP 54 Deg F

Entering water temp deg.C 44 Deg F

Leaving water temp deg.C 54 Deg F

Water flow (lpm) 10 lpm

Fan static pressure 25 mm WG

Coil face velocity

Not to exceed

350 fpm

Fan motor KW

Type of fan motor TEFC Sq. cage

Type of protection IP 55

Type of insulation Class F

Type of Rough filters HDPE filter

Commissioning filters To be included

CABINET TYPE EXHAUST FANS

Type of fan

Cabinet

centrifugal Cabinet centrifugal Cabinet centrifugal

Air quantity AS PER BOQ

Total static pressure 40 mm WG 40 mm WG 40 mm WG

Type of blade Forward curved Forward curved Forward curved



Type of discharge Top discharge Horizontal discharge Horizontal discharge

Motor KW AS PER BOQ

Operating voltage 415 V - 3 phase 415 V - 3 phase 415 V - 3 phase

Type of drive Belt drive Belt drive Belt drive

Exhaust air gravity louver Part of unit Part of unit Part of unit

Variable speed drive Required Required Required

Carbon-di-oxide sensor Required Required Required

STAIRCASE PRESSURISATION FAN

Type of fan Wall mounted Wall mounted

Air quantity AS PER BOQ

Total Static pressure 65 mm WG 65 mm WG

Type of fan Tube axial Tube axial

Operating voltage 415 V 3 phase 415 V 3 phase

Type of motor Flame proof Flame proof

Fire rating 90 minutes 90 minutes

VARIABLE FREQUENCY DRIVES

Power supply 415 V - 3 phase

Motor capacity As per BOQ

Maximum ambient temp. 45 deg. C

Range

0-250 Hz at

constant torque

Enclosure IP 55

Control connection

AI & AO - 0 to 10

V 4 to 20 mA



Resolution 0.10%

Accuracy 1%

Protection

Over current, over

and under

voltage, over

temperature,

short circuit, earth

fault, input phase

loss, overload and

stall protection

Accessories

Floor

mounted/wall

mounted panel

with bypass

starter and

selector switch for

manual operation

Control feed back

Through

differential

pressure sensors

Supply voltage 24 V AC, 50 Hz

Function Linear

Output

0 to 1 V DC/0 to5

mA DC

Harmonics Less than 5%

Bypass starter in an enclosure

To be included

(stardelta starter

above 5.5 KW)



14APPROVED LIST OF MATERIALS- HVAC

Screw chiller packages Carrier/York/Trane/Dunhambush/Daikin Mcquay

Heat pump / Heat Recovery chiller Daikin / Trane

Cooling towers Marley/BAC/Advance/ DaikinMcquay/Nihan Spindle

Pumpsets Grundfoss/ Bell & Gossett/ Armstrong

Airhandling units System Air / Flaktwoods/VTS

Ceiling suspended AHU System Air / Flaktwoods/VTS/ZECO

Plenum for airhandling units System Air / Flaktwoods

Sound attenuators System Air / KC

Variable Air volume units Johnson/Trane/Trox

Inline fans Kruger/Systemair/Greenheck/Nicotra

Propeller fans Khaitan/GEC/Aldes/Kruger/Nuair/Systemair/Nicotra

Centrifugal fans Comefri/Nicotra/Kruger/Greenheck

Variable frequency drives Danfoss/ABB/ Siemens

Motors KEC/ABB/Crompton/Siemens

Filters Spectrum/EMW/John Fowler/Dyna/Aerosol

Rigid spiral ducts Karthila/Fabtech/Perfect pipes/Western Airducts

Ducting system Rolastar/Zeco/Camduct/7 star

Vibration isolators Gerb/Resistoflex/Dunlop

Grilles & Diffusers Airmaster/Systemair

GI sheets SAIL/Jindal

Aluminum sheets Indal/Jindal

Stainless steel sheets Sail/Jindal

MS pipes TATA/Jindal

Butterfly valves Audco/ Advance/ Bonami

Preinsulated Butterfly valves Valtree

Ball valves Audco/RC/CIMM/Advance

Preinsulated Ball valves Valtree

Check valves Advance/Castle

Balancing valves Tour & Anderson/Advance

Strainer DS Engg/Sant/Emerald

Preinsulated Strainer Valtree

PICV valves Danfoss / Flowcon/Sevcon

Motorised valves Johnson/Sauter/Honeywell/Siemens

Flexible ducts Aeroflex/Superlon/Syatemair

Dampers Airmaster/Systemair

Thermostats Johnson/Sauter/Honeywell/Siemens



Expanded Polystyrene Beardsel/Quality Thermopack

Extruded Polystyrene Owens Corning / Lloyd

Fibreglass material UP Twiga/KIMCO/Owens Corning

Control Cables Finolex/Varsha

Pipe/duct supports Hi-tech/Perfect supports

Expansion joints Techo-flex/Cori/Kanwal

Automatic expansion tanks Wellmate/Cimm

Automatic airvents Metraflex/Taco/Flamco/Anergy/flexovert

Synthetic foam Vidoflex/Armaflex/Pylon/K Flex / Thermobreak

Ball valves Itap/Econosto/CIMM/RC

Thermometers/pressure gauges Dwyer/Waaree

Carbon-Di-Oxide Sensor Anergy/Waree/Seimens/Sauter

Pressure/Temperature sensor Dwyer/Siemens/Sauter/Honeywell/Trane/Johnson/Huba

Manometer Dwyer

HDPE pipe Finolex/Oriplast/Hasti/Jain

Condensate drain pumps Little Giant USA

Air curten Systemair

Plate Heat Exchanger Sondex / Alfalavel / GEA coplex

Basement Ventilation Greenheck

Jet Ventilation Greenheck

PACU Stulz / Emerson

Hiwall Unit York

MCB & DB’s Siemens / Larsen & Toubro / ABB

Moulded case circuit breakers Larsen & Toubro / Siemens / ABB

Panel Elins / Pace switchgear / Lotus switch gear / Load

controls / Pragathi controls / Prakash power products

Cables Unistar / Polycab / Esbee cables / Finolex / Ravincab

PVC wires Power flex /Polycab / Esbee cables / Finolex / Ravincab

SPECIAL NOTE:

Contractors intending to supply makes of materials and equipments other than the ones

listed above shall indicate clearly the makes in the offers highlighting the salient features and

advantages of that make supported by technical literatures. The right of accepting such

make rests with the Consultants/Project Managers/Owners. Owners reserve the right to select

a particular make they desire from this approved list. The makes proposed during the tender

stage by the contractor may get changed during the submittals stage after the award of the

contract. The approval of the makes of the grilles and diffusers is subject to the approval of

the samples during the submittal stage.



15.BILL OF QUANTITIES

Project : NCSCM

a

b

c

d

e

f

Contractor to be responsible for hiring / operating of all machines / equipment. Approval to be obtained from Project Management Consultant before operating.

Quoted rates to exclude taxes and added separately in grand summary sheet.

GENERAL NOTES COVERING BILL OF QUANTITIES

Contractors should factor in prices for DG power / water / storage etc. None will be provided for at site.

The minimum quality benchmark will be decided by the Owner / Project management consultant / Architect based on mock up samples before commencing work.

Unless otherwise specified the rates quoted shall be inclusive of the following ~ Cost of material, taxes, transport, labour, overheads and profit, etc.,

No wastages shall be paid separately. The same shall be factored in the quoted rate.

Architect : Flying Elephant Studio 119 McD BERL Pvt.Ltd

Project : NCSCM HVAC BOQ

SL.NO. ITEM DESCRIPTION AMOUNT EXCLUDING TAXES

ED VAT SERVICE TAX

1 Chiller BOQ

2 Pumps BOQ

3 Cooling Tower BOQ

4 AHU's & Fan's BOQ

5 Low side HVAC works BOQ

6 Electrical related HVAC works BOQ

TOTAL

SUMMARY - HVAC WORKS BOQ

TAXES

GRAND TOTAL EXCLUDING TAXES

TAXES

GRAND TOTAL INCLUDING TAXES

Architect : Flying Elephant Studio 120 McD BERL Pvt.Ltd

Project: NCSCM Bill of Quantites

SL NO DESCRIPTION OF WORK UNIT QTY RATE (Rs.) AMOUNT (Rs.)

Design, Supply, Installation, Testing & Commissioning of Air-Conditioning system for NCSCM, Chennai as follows:

1

Water cooled chiller package suitable for HFC 134a having Multiple compressor of equal capacity of screw type ( semi/hermetic type) complete with suction and discharge shut off valves and with Variable speed drive, HP/LP cutouts, oil pressure failure switch, gague panel, cranckcase heater, automatic capacity control,microprocessor based control for chiller control,watercooled condenser, DX/Flooded chiller,with multiple circuits, controls such as thermostatic expansion valve, cooling thermostat antifreeze thermostat, water pressure/flow switch refrigerant pipes and fittings, strainer, sight glass isolating valves, rubber bellows, suction line and chiller insulation, first charge of gas and oil, base frames, GI casing, vibration isolators as per specifications.

a 125 TR Water cooled screw chiller with HFC 134a Refrigerant Nos 2

b Installation, clearance, freight upto site, insurance and commissioning charges Nos 2

2

Single stage centrifugal coupled horizontal type pumpset with axial suction port and radial discharge port,with EFF1 drive motor, bronze impeller mechnical seal, three phase TEFC squirrel cage motor with IP55 protection, class F insulation having a speed of 1440 rpm with inertia base, vibration isolation springs, rubber isolation bellows, flexible coupling for chilled water circulation having the following duty conditions as per specifications

Primary Chilled Water pump,

a 1136 LPM against a head of 10 m with EFF1 motors - Pumps supply only Nos 3

b Installation, clearance, freight upto site, insurance pump insulation and commissioning charges Nos 3

3


Secondary Chilled Water pump,

a 1136 lpm against a head of 20 m with EFF1 motors - Pumps supply only Nos 3


Architects: Flying Elephant Studiolast modified on: 18 May 2013 121

McD BERL Pvt. LtdNCSCM BOQ


4


Condenser Water pump,

a 1420 lpm against a head of 20 m with EFF1 motors - Pumps supply only Nos 3


5

Non combustible fibreglass towers having cross flow design, basin, PVC louver, drift eliminator, low noise fan, ladder, vibration isolators, nozzles TEFC squirrel cage type with variable speed induction motor with IP 55 protection and class F insulation suitable for chiller capacity of following TR and an approach of 5 deg F as per specifications

a Cooling tower suitable for 125 TR Chiller Nos 2

b Installation, clearance, freight upto site, insurance and commissioning charges Nos 2

6

Microprocessor based pump logic controller with adjustable frequency drive for motor, complete by pass starter with IP 55 Enclosure, Required quantity of differential pressure / temperature transmitter, incoming MCCB / ACB with control wirng for software integration, built in Software integrator suitable for BAS as per specifications

a For Secondary pumpset( 2 +1 ) with differential pressure transmitter and wiring Set 1

b Installation, clearance, freight upto site, insurance and commissioning charges Set 1

7

Floor mounted airhandling unit with double skin consturction complete with filter section with pre filters and fine filters ( MERV13),Variable speed drives with suitable bypass starters, multi row chilled water coils, fan section with backward curved plugtype/ direct driven drive motor, canvas, supports,commissioning filters, vibration isolators and outlet damper, fire damper as per specifications

a Air Handling unit having a capacity of 17 TR and 7000 cfm against a static pressure of 65 mm WG and suitable drive motor - Supply only Nos 1

b Clearance, Freight upto site Transportation, insurance installation and commissioning Nos 1

c Air Handling unit having a capacity of 12 TR and 5000 cfm against a static pressure of 65 mm WG and suitable drive motor - Supply only Nos 1

d Clearance, Freight upto site Transportation, insurance installation and commissioning Nos 1




8

Ceiling suspended airhandling unit with double skin construction complete with filter section with filters, multi row chilled water coils, fan section with forward curved centrifugal fan, drive motor, canvas, supports, vibration isolators, commissioning filters, outlet dampers, drain pan with pump as per specifications

a Air Handling unit having a capacity of 15 TR and 5000 cfm against a static pressure of 50 mm WG and suitable drive motor - Supply only Nos 1


c Air Handling unit having a capacity of 10 TR and 4000 cfm against a static pressure of 40 mm WG and suitable drive motor - Supply only Nos 10


e Air Handling unit having a capacity of 7.5 TR and 3000 cfm against a static pressure of 40 mm WG and suitable drive motor - Supply only Nos 7

f Clearance, Freight upto site Transportation, insurance installation and commissioning Nos 7

g Air Handling unit having a capacity of 5 TR and 2000 cfm against a static pressure of 40 mm WG and suitable drive motor - Supply only Nos 5

h Clearance, Freight upto site Transportation, insurance installation and commissioning Nos 5

i Air Handling unit having a capacity of 3 TR and 1200 cfm against a static pressure of 40 mm WG and suitable drive motor - Supply only Nos 4

j Clearance, Freight upto site Transportation, insurance installation and commissioning Nos 4

k Air Handling unit having a capacity of 2.5 TR and 1000 cfm against a static pressure of 40 mm WG and suitable drive motor - Supply only Nos 1

l Clearance, Freight upto site Transportation, insurance installation and commissioning Nos 1

10

High Precision Units floor mounted type with chilled water coil, fine filter, heater and humidifier section, EC fan, drive motor, for evaporator fan, return air louvers, MS / GI powder coated casing, microprocessor control, hardware and software for BAS hookup, controls as per specifications.

a 10 TR , 5200 cfm Nos 1

c Clearance, Freight upto site Transportation, insurance installation and commissioning Nos 1

11

High Precision Units floor mounted type with DX coil, fine filter, heater and humidifier section, EC fan, drive motor, Variable speed drive for evaporator fan, return air louvers, MS / GI powder coated casing, microprocessor control, hardware and software for BAS hookup, controls, ref. Piping as per specifications.

a 10 TR , 5200 cfm Nos 1




c

Copper refrigerant piping, insulation, drain piping, frame work for indoor and outdoor and other accessories including Electrical cable/wiring and Clearance, Freight upto site Transportation, insurance installation and commissioning(Indoor and out door units location to be reffered In the drawing)

Lot 1

12

Chilled water Fan coil unit of double skin construction with compact cooling coil, multispeed fan motor, the blower shall be dynamicaly balanced and designed for silent operation, the filters shall be washable synthetic media type arranged for convenient cleaning and replacement, drain pan with pump .The units as specified in Schedule ofQuantities shall be factory fitted with valve package comprising of 2 way pressure independent valve suitable for variable CHW flow with modulating actuator, ball with Y strainer valve at inlet & Ball valve at outlet and necessary piping connections. The actuator of modulating valve shall be provided with interface cards to receive 0-10V or 4-20 mA signal from Minxon Digital Thermostat.The unit is supplied with corded remote controller of approved as per specifications

a Fan Coil Unit having a capacity of 1 TR and 400 cfm against a static pressure of 15 mm WG and suitable drive motor - Supply only Nos 18


13

Chilled water Cassette type indoor units with compact cooling coil, multispeed fan motor, the blower shall be dynamicaly balanced and designed for silent operation, the filters shall be washable synthetic media type arranged for convenient cleaning and replacement and inbuilt drain pump.The units as specified in Schedule of Quantities shall be factory fitted with valve package comprising of 2 way pressure independent valve suitable for variable CHW flow with modulating actuator, ball with Y strainer valve at inlet & Ball valve at outlet and necessary piping connections. The actuator of modulating valve shall be provided with interface cards to receive 0-10V or 4-20 mA signal from Minxon Digital Thermostat.The unit is supplied with corded remote controller of approved as per specifications

a Cassette Unit having a capacity of 3.0 TR and 1200 cfm against a static pressure of 15 mm WG and suitable drive motor - Supply only Nos 1


c Cassette Unit having a capacity of 2.5 TR and 1000 cfm against a static pressure of 15 mm WG and suitable drive motor - Supply only Nos 3


e Cassette Unit having a capacity of 2.0 TR and 800 cfm against a static pressure of 15 mm WG and suitable drive motor - Supply only Nos 5

f Clearance, Freight upto site Transportation, insurance installation and commissioning Nos 5




13

Chilled water High wall mounted indoor units with compact cooling coil, multispeed fan motor, the blower shall be dynamicaly balanced and designed for silent operation, the filters shall be washable synthetic media type arranged for convenient cleaning and replacement and drain pan.The units as specified in Schedule of Quantities shall be factory fitted with valve package comprising of 2 way pressure independent valve suitable for variable CHW flow with modulating actuator, ball with Y strainer valve at inlet & Ball valve at outlet and necessary piping connections. The actuator of modulating valve shall be provided with interface cards to receive 0-10V or 4-20 mA signal from Minxon Digital Thermostat.The unit is supplied with corded remote controller of approved as per specifications

a Hiwall Unit having a capacity of 1.0 TR and 400 cfm against a static pressure of 15 mm WG and suitable drive motor - Supply only Nos 5


14

Supply, installation testing & commissioning of Hi wall Split air conditioner of 1.0 TR /400 cfm capacity with Scroll compressors with matching condensers MS Frame for mouting the units to be provided with rubber pads, the frame should be painted with two coats for ATM ground floor.

Nos 1

a

Copper refrigerant piping, insulation, drain piping, frame work for indoor and outdoor and other accessories including Electrical cable/wiring and Clearance, Freight upto site Transportation, insurance installation and commissioning(Indoor and out door units location to be reffered In the drawing)

Lot 1

15

Supply, Installation, Testing and commisioning of Double skin outdoor mounted type Heat recovery unit made of 50mm thick panels consisting of GI casing of thickness 0.63mm outside layer and 0.63mm inside layer with factory injected PUF insulation, Supply & Return air Centrifugal blower(Forward curved/backward curved)sections with aerofoil constructions, Heat recovery wheel section, belt drive packages with TEFC motor suitable for operation on 415 +/- 10% volts, 50 Hz, 3 phase, A.C. power supply, Fresh air Pre-filter section, Heat recovery descicant wheel, Fresh air, return air & exhaust air dampers with suitable actuator with a provision for CO2 signal sensing,CO2 sensors with wiring to be included for each unit and all the necessary accessories, necessary vibration isolators and complete as per specifications. The duties of equipments listed below and accessories shall be as per equipment schedule. Heat recovery wheel efficiency should not be less than 75%. Unit shall be with VFD and with suitable bypass starter and BMS compatible and as per specifications

a 900 Cfm Fresh air and Exhaust against a static pressure of 50 mm WG having suitable drive motors Nos 2

18

Cabinet type Exhaust air handling unit with double skin construction complete with damper gravity louver, cengrifugal blower, 3 phase drive motor, anti vibration mounts suitable for floor mounting with commissioning filters having capacities as follows as per specifications:

a 4500 cfm against a static pressure of 40mm WG having suitable drive motor Nos 1

b 2800 cfm against a static pressure of 40mm WG having suitable drive motor Nos 2


c 1650 cfm against a static pressure of 40mm WG having suitable drive motor Nos 1




18

Cabinet type Fresh air handling unit with double skin construction complete with damper gravity louver, cengrifugal blower, 3 phase drive motor, anti vibration mounts suitable for floor mounting with commissioning filters having capacities as follows as per specifications:



c 1870 cfm against a static pressure of 40mm WG having suitable drive motor Nos 2

d 1400 cfm against a static pressure of 40mm WG having suitable drive motor Nos 1

e 1150 cfm against a static pressure of 40mm WG having suitable drive motor Nos 1

19

Inline type Fresh air fan with double skin construction complete with damper gravity louver, centrifugal blower, 3 phase/1 Phase drive motor, anti vibration mounts suitable for floor mounting having capacities as follows as per specifications



20

Cabinet type Exhaust air handling unit( Kitchen area ) with double skin construction complete with damper gravity louver, cengrifugal blower, 3 phase drive motor, anti vibration mounts suitable for floor mounting with commissioning filters having capacities as follows as per specifications:


21

Cabinet type Fresh air handling unit( Kitchen area ) with double skin construction complete with damper gravity louver, cengrifugal blower, 3 phase drive motor, anti vibration mounts suitable for floor mounting with commissioning filters having capacities as follows as per specifications:


22Machine made GSS Ducting with flanges, neoprene gaskets, factory made supports, with black painting as per specifications (factory made with ductmate flanges)

a 24 G Sqm 2150b 22 G Sqm 650c 20 G Sqm 5

23 Alluminium Fresh/Exhaust air louver of aerofoil construction wiyh nylon mosquito net,dampers as per specifications as follows:

a Rate per sq.mt of louver face area Sqm 2

24 Aluminium volume control dampers with PVC gear and opposed bladeswith handle as per specs.(Shall be suitable for motorised actuation)

a Rate per sq.mt of face area Sqm 14

25GSS Fire Dampers with 90 min fire rating with temperature sensor, alarm panel with motorised actuator, provision for receipt of external fire signal, wiring as per specifications.

a 500 x 150 Nos 8b 300 x 150 Nos 12




c Rate per sq.mt of face area Sqm 2d Actuator No's 20

26 Aluminium powder coated diffusers having regular design

a 600 x 600 supply air diffuser with VCD Nos 20

c 600 x 600 return air diffuser w/o VCD Nos 20

29 Aluminium powder coated Jet Nozzle Diffusers as per specs

a 650 cfm Nos 1

30Floor grilles with extruded aluminium louvres, 4 quadrant with independent volume control dampers and frame work having a size of 600 x 600 mm as per specifications

Nos 6

31 Aluminium flexible duct with 25 mm thick insulation , worm clips,supports as follows

a 250 mm dia Rmt 60

32 Aluminium powder coated continous grilles with 0/15 deg. Deflection as follows

a 100 mm wide Rmt 950

33 Aluminium powder coated Spot grille/Stoke discreate grille with 0/15 deg.Deflection as follows

a 1000x100 Nos 9

34 Aluminium powder coated Supply/exhaust air Disc valve with opposed blade

a 150 mm dia for toilets Nos 150

35PVC flexible duct with worm drive clamps having the following sizes as per specifications as follows:(alternatively single skin aluminium flexible shall be offered)

a 150 mm dia Rmt 90

36 Acoustic lining of ducting with 15mm thick open cell nitrile rubber insulation with aluminium tape as per specifications Sqm 500

37 Duct insulation with 15 mm thick close cell nitrile rubber insulation factory laminated aluminium foil and aluminium tape as per specs Sqm 1300

38

Chilled water piping with black steel pipes, fittings, RCC Sleepers, factory made supports, sand cushioning including digging and refilling of earth for buried pipes along with Thermal insulation of buried chilled water pipes with TF Quality EPS insulation, finished with sand cement plaster and tarfelt as per specifications:

MS 'C' Class pipe with insulation as per specifications,(BURREED PIPES)

a 200 mm dia Rmt 100b 150 mm dia Rmt 20b 125 mm dia Rmt 25c 100 mm dia Rmt 100d 80 mm dia Rmt 120e 65 mm dia Rmt 45




39

MS pipes for chilled water applications above ground with 19 mm thick nitrile rubber which bonds to the pipe, the outer casing material shall be galvanized, stainless steel or high density polyethylene tubes with vapour barrier, comply to class O fire rating standards with comprehensive strength upto 275 kPa, the PU Foam shall be CFC Free agent finished with supports/hangers as per specificationsABOVE GROUNDMS 'C' Class pipe with insulation as per specifications,

a 150 mm dia Rmt 25b 125 mm dia Rmt 25

MS B Class

c 100 mm dia Rmt 25d 80 mm dia Rmt 150e 65 mm dia Rmt 50f 50 mm dia Rmt 300g 40 mm dia Rmt 100h 32 mm dia Rmt 120i 25 mm dia Rmt 200

All valves are to be considered with nitrile rubber insulation finished with polyshied as per specifications

40 Butterfly valves with insulation as per specifications,

a 200 mm dia Nos 2b 150 mm dia Nos 16c 80 mm dia Nos 8d 65 mm dia Nos 4e 50 mm dia Nos 153f 40 mm dia Nos 17g 32 mm dia Nos 78

41 Y type strainers with insulation as per specifications,

a 150 mm dia Nos 6b 65 mm dia Nos 2c 50 mm dia Nos 8d 40 mm dia Nos 3e 32 mm dia Nos 37

42 Wafer type check valves with insulation as per specifications,

a 150 mm dia Nos 6

43Two way motorised valve with actuator and transformer as per specifications having the following water flow, clearance, installation and with insulation as follows,

a 227 lpm Nos 1b 182 lpm Nos 1c 136 lpm Nos 2d 91 lpm Nos 6e 68 lpm Nos 3f 45 lpm Nos 29g 27 lpm Nos 8

44 Balancing valves with insulation as per specifications

a 150 mm dia Nos 2b 65 mm dia Nos 2c 50 mm dia Nos 8d 40 mm dia Nos 3e 32 mm dia Nos 37

45 Motorised Butterfly valves with insulation as per specifications

a 150 mm dia Nos 2




46 100 mm dia Dial type pressure gauges with thermo port Nos 112

47 Industrial type thermometers with thermo port Nos 100

48Drain piping using CPVC pipe SDR11 with CPVC fittngs and insulated with 6mm thick nitrile rubber insulation finished with polyshield. The pipe goes below ground should be rapped with polythene sheet as follows:

UNDER GROUND

a 65 mm dia Rmt 150

Above GROUND

b 50 mm dia Rmt 45c 40 mm dia Rmt 30d 32 mm dia Rmt 50e 25 mm dia Rmt 350

49 Membrane type automatic expansion tank having a capacity of 1000 litres as per specifications Nos 1

50 Condenser water pipes with black steel fittings, factory made supports as follows:

ABOVE GROUNDMS 'C' Class pipe with insulation as per specifications,

a 200 mm dia Nos 30b 150 mm dia Nos 20

51 Butterfly valves is as per specifications,

a 150 mm dia Nos 14b 100 mm dia Nos 2b 50 mm dia Nos 2

47 Y type strainers is as per specifications,

a 150 mm dia Nos 3

48 Wafer type check valves is as per specifications,

a 150 mm dia Nos 3

49 Balancing valves is as per specifications,

a 150 mm dia Nos 2

50 Motorised Butterfly valves is as per specifications,

a 150 mm dia Nos 4

52 100 mm dia Dial type pressure gauges with thermo port Nos 10

53 Industrial type thermometers with thermo port Nos 4

54

The air seperator with Dirt seperator fabricated with Steel finished with dirt chamber, air chamber, vent units, automatic valve, drain valve, suitable for flushing even when in operation, suitable for threaded or flanged connections as per specifications of the following sizes

a 200 mm dia Nos 1

55 Chemical dosing unit Nos 1

56Condesate water connections,(from Condensate tank to Makeup tank) pump with level controller,valves and codensate tank with insulation

Set 1




TOTAL

BILL OF QUANTITIES FOR ELECTRICAL RELATED HVAC WORKS FOR NCSCM

1.0 16Amp/6Amp Universal switch socket outlet

Supply and fixing of modular 6/16A,5 pin single phase switch socket outlet fixied in a suitable size metal sheet box suitable for switches and sockets,including supply of fixing materials interconnections complete as required and approved by the consultant/client.

Supply Point 150Installation Point 150

2.0

Supply and wiring with FRLS 2Rx4.0sqmm+1Rx2.5sqmm of 1.1KV grade,ISI marked,PVC insulated single core stranded copper conductor cable conforming to IS:694(with latest amendments) in existing conduit / raceways from DB to the first point as required and approved by the consultant/client.Supply Mtrs. 1000Installation Mtrs. 1000

2.1

Supply and wiring with FRLS 4Rx6.0sqmm+1Rx4.0sqmm of 1.1KV grade,ISI marked,PVC insulated single core stranded copper conductor cable conforming to IS:694(with latest amendments) in 25mm dia conduit from DB to the first point as required and approved by the consultant/client.Supply Mtrs. 1000Installation Mtrs. 1000

3 MCB Distribution boards:

Supply and installation of following TPN/SPN MCB DBs of CRCA sheet steel enclosure,dust and vermin proof ,rated for 440V/230V. 3/1 phase,50 HZ AC supply, operation(doubledoor type )inclusive of busbar of suitable capacity,neutral link with required outgoings,DIN bar,and earthing terminals and with silicon based fire/ Heat resistant coating appiled inside the DB and painted with approved shade of paint suitable for incorporating SP/DP/TP MCB as specified below with all materials required including supply and fixing of MCBs/ ELMCBs / Isolators/ SFUs and fixed in flush with wall along with all materials required including all associated civil works and earthing as per specifications and the SLD, The MCB & MCCB' S have the Ka Rating-10kA

3.1 6 WAY VTPN DB( For Internal Main AC distribution DBs for all the floors)3 Phase 6 way.Incoming 63A 4P MCCBOutgoings: 63A TP MCB - 6 Nos.Supply Each 7Installation Each 76WAY TPN DB (For AC Single phase)-With Sub meter

3.2 3 Phase 8 way.Incoming 32A TPN MCBSub incommer: 1No. 25A DP ELCB for each phase

Outgoings: 12 Nos.10/16A SP MCB ( 'C' curve) with timer controlled

Supply Each 9Installation Each 9

4 LT XLPE Cables




Supply of 1.1 KV grade, 2C/3C/3.5C/4C, XLPE insulated, and PVC overall sheathed, stranded aluminium/Copper conductor, flat steel strip/ wire armoured cables conforming to IS:1554/ Part I (with latest amendments)and of following sizes.The cable shall bear ISI certification mark. Laying of the cable in ground/existing cable tray/duct/shaft including transportation of cable to site,excavation of earth, laying the cable and covering with sand and placing the bricks on sides and top,refilling with earth and providing cable route/ joint markers complete as required. (the laying of cable in trench shall include removing the trench cover, reclosing it after laying cable in good condition and fixing it to the cable suupports on wall with suitable clamps including supply of clamps complete as required)

4.1 3.5C X 150 Sq.mm AR. AL Cable (for CHILLERS)Supply Mtrs 75Laying Mtrs 75

4.2 4C X 25 Sq.mm AR. AL Cable (for Primary pumps, secondary pumps andcooling towers,DB )Supply Mtrs 500Laying Mtrs 500

4.3 4C X 6Sq.mm AR. AL Cable (AHU )Supply Mtrs 200Laying Mtrs 200

5 LT XLPE Cables End termination(Tinned copper lugs, long barrel )

5.1 3.5C X 150 Sq.mm AR. AL Cable (for CHILLERS) Nos 4

5.2 4C X 25 Sq.mm AR. AL Cable (for Primary pumps, secondary pumps andcooling towers) )

Nos 24

5.3 4C X 6 Sq.mm AR. AL Cable Nos. 34

6.0 Ladder/ Perforated type Cable traySupply and instllation of 2mm thick GI perforated/ ladder type cable tray with side rail using suitable revets, washers, bolts,supporting brackets of same make and all other accessories required for fixing the cable tray complete as required and as directed by the Engineer-in-charge.

6.1 300 X 100 X 2mm wide ladder type cable traySupply Mtrs 20Laying Mtrs 20

6.2 CONDUITS

Supply and Laying and fixing of FRLS PVC conduits of 2mm thick of the following sizes in slab or external with necessary fixing accessories for PAsystem, home automation and bms integaration as required with necessary accessories such as bends, collars, junction boxes and pull boxes and with covering covering plate as required as per the site condition and as approved by the client/ consultants.

6.3 25mm dia conduitSupply Mtrs 1000Laying Mtrs 1000

7.0 PART‐4 LT PANELS1.The rates shall include 100mm painted MS channel frame/ cement foundation/suspening arrangement 2.Cost of all testing are deemed to be included in the rates

7.1 AC PANEL‐1 (Loc: Chiller Room)Design, manufacture, testing, installation, commissioning of Main L.T panel (MDB) Incomer :‐ One main incomer of 400 4P EDO 50KA MCCB.400/5A, 10VA, C1 CTs (for Ammeter) - 1 NoCBCT ELR - 1 setThree (3)- phase indicating lamps with MCBs. (LED type)-03 sets




Bus Bar:400A TPN+E insulated Alu. Bus bar: 50kAOut goings :200 Amps TPN MCCB - 316 Amps TPN MCCB - 13 No

200A=1no 4P 50 KA MCCB WITH THERMAL MAGNETIC BASED O/L,S/C,

RELEASES WITH SP TERMINALS, FD KITCONTROL MCB 6A SP=1no.TIMER 0-30 SEC=1no.A/M SELECTOR SWITCH=1no. INDICATING LAMPS ON/OFF/TRIP=1setPUSH BUTTON ON/OFF=1setPOWER TERMINALS=1setCONTROL TERMINALS=1set OUTGOINGS:1.200A=3 nos TPN MCCB

16 A =1no 4P 50 KA MCCB WITH THERMAL MAGNETIC BASED O/L,S/C,

RELEASES WITH SP TERMINALS, FD KITCONTROL MCB 6A SP=1no.TIMER 0-30 SEC=1no.A/M SELECTOR SWITCH=1no. INDICATING LAMPS ON/OFF/TRIP=1setPUSH BUTTON ON/OFF=1set POWER TERMINALS=1set CONTROL TERMINALS=1set OUTGOINGS:1.16A=13nos. TPN MCCBSupply No. 1Installation No. 1

7.2 AHU STARTER PANEL

'VFD provision' with bypass STAR/DELTA STARTER with Overload,Single phasing, Under voltage and overvoltage, phase reverse protection with necessary internal wiring. Starter should be compatible for BMS also with necessary inputs and outputs provisions, power and control wiring should be carried out as per IS standards suitable for current ranging from (0--16)Ampere.VFD cab have Single phase input also

nos 3

7.3 PUMP STATER PANELS 'VFD provision' with bypass STAR/DELTA STARTER with Overload,Singlephasing, Under voltage and overvoltage, phase reverse protection with necessary internal wiring. Starter should be compatible for BMS also with necessary inputs and outputs provisions, power and control wiring should be carried out as per IS standards suitable for current ranging from (0--25)Ampere.

nos 3




7.4 PUMP STATER PANELS‐STAR/DELTA TYPESupply, installation, testing and commissioning of STAR/DELTA STARTERwith, Overload,Single phasing, Under voltage and overvoltage, phase reverse protection with necessary internal wiring. Starter should be compatible for BMS also with suitable cabinet .Stareter panel should meet the requiremnst of following loads(85kw-2,6.25kw-2,2.98kw-3,7.46kw-2,)

no.s 10

8 EARTHING STRIP8.1 25x6mm GI strip (body earthing for Fencing, SUB- panels and DBs) Mtrs 2008.2 8 Guage CU. strip (body earthing for Primary,Secondary,Cooling

Towers,Chillers)Mtrs 50

8.3 DANGER BOARDS :Supplying & fixing of 0.415KV danger boards with the word "DANGER" written in English & Kannada as per EB/LOCAL EB AUTHORITIES requirement.

Nos. 5

8.4 SAFETY ITEMS8.4.1 Rubber mats, 1M wide and 10 mm thick, 1100V grade RM 10

8.4.2 Fire Extinguishers, ELECTRICAL DUTY 4.5Kg ABC Powder Nos. 4

8.4.3 Danger Boards on subpanels, In English, HINDI & LOCAL LANGUAGE. Nos. 20

8.4.4 Artificial Respiration Charts-In English, HINDI & LOCAL LANGUAGE Nos. 1

8.4.5 Cable route marker as required Nos. 25

TOTAL

GRAND TOTAL

