section 02800 - irrigation systems

ABU DHABI MUNICIPALITY

PUBLIC GARDENS DIRECTORATE

GENERAL SPECIFICATION FOR

LANDSCAPE WORKS

SECTION 02800

IRRIGATION SYSTEMS

Document No. Revision Date General Specification for Landscape Works 02800

PGD/CDM 02 MAR 2005 Irrigation Systems Page 1



General Specification for Landscape WorksPublic Gardens Directorate

Abu Dhabi Municipality

DOCUMENT CONTROL SHEET Revision No.

Date

Revision Description / Purpose of Issue

00 FEB 2004 New Section Production.

01

SEP 2004 Submission to SPC for dissemination to design Consultants for comments.

02

MAR 2005 Amendment # 1

03

04

05

06

07

08

09

10

Approved for Implementation:_______________________________________________





TABLE OF CONTENTS

COVER SHEET ...................................................................................................................... 1 DOCUMENT CONTROL SHEET............................................................................................ 2 TABLE OF CONTENTS ......................................................................................................... 3 PART 1 GENERAL .............................................................................................................. 5 1.01 SCOPE ................................................................................................................... 5 1.02 RELATED DOCUMENTS ....................................................................................... 5 1.03 STANDARDS.......................................................................................................... 5 1.04 DEFINITIONS ......................................................................................................... 6 1.05 QUALITY CONTROL.............................................................................................. 6 1.06 SUBMITTALS ......................................................................................................... 8 1.07 DELIVERY, STORAGE, AND HANDLING ........................................................... 12 1.08 WARRANTY ......................................................................................................... 13 1.09 COMPLIANCES.................................................................................................... 13 PART 2 PRODUCTS.......................................................................................................... 14 2.01 GENERAL............................................................................................................. 14 2.02 PIPES AND FITTINGS ......................................................................................... 14 2.03 PVC-U CEMENT PRIMER LUBRICANT AND TAPE ........................................... 17 2.04 UNDERGROUND WARNING TAPE .................................................................... 17 2.05 THRUST BLOCKS................................................................................................ 17 2.06 VALVES AND ACCESSORIES ............................................................................ 18 2.07 VALVE CHAMBERS AND VALVE BOXES .......................................................... 22 2.08 BUBBLER ............................................................................................................. 23 2.09 EMITTERS............................................................................................................ 24 2.10 SPRINKLERS ....................................................................................................... 26 2.11 FILTERS............................................................................................................... 30 2.12 CENTRAL IRRIGATION CONTROL SYSTEM..................................................... 32 PART 3 EXECUTION......................................................................................................... 37 3.01 INSTALLATION PROCEDURE ............................................................................ 37 3.02 EXCAVATION....................................................................................................... 38 3.03 BACKFILLING ...................................................................................................... 39 3.04 PVC PIPE INSTALLATIONS ................................................................................ 39 3.05 HDPE PIPE INSTALLATION ................................................................................ 42 3.06 ANCHOR AND THRUST BLOCKS....................................................................... 46 3.07 VALVES................................................................................................................ 46 3.08 VALVE BOXES AND CHAMBERS....................................................................... 46 3.09 END FLUSHING POINTS..................................................................................... 47 3.10 IRRIGATION EQUIPMENT................................................................................... 47 3.11 ELECTRICAL INSTALLATIONS........................................................................... 47 3.12 CENTRAL CONTROL SYSTEM........................................................................... 50 3.13 FIELD CONTROLLERS INSTALLATIONS........................................................... 51 3.14 FIELD TESTING ................................................................................................... 51 3.15 AUTOMATIC SYSTEM COMMISSIONING .......................................................... 53





3.16 IRRIGATION AND CONTROL SYSTEM.............................................................. 53 PART 4 ESTABLISHMENT OPERATIONS AND MAINTENANCE (365 DAYS) .............. 53 4.01 GENERAL............................................................................................................. 53 4.02 ORGANIZATIONAL STRUCTURE....................................................................... 54 4.03 SYSTEM MONITORING....................................................................................... 54 4.04 SYSTEM FLUSHING............................................................................................ 56 4.05 SERVICING OF ELECTRIC REMOTE CONTROL SOLENOID VALVES AND

COMPONENTS .................................................................................................... 56 4.06 ADJUSTMENTS AND CLEANING ....................................................................... 57 4.07 EMERGENCY REPAIRS. ..................................................................................... 57 END OF SECTION ............................................................................................................... 58





PART 1

1.01 SCOPE

1.02

1.03

GENERAL

A. This section includes the preparation and installation of automatic irrigation

system for Abu Dhabis gardens and landscapes including piping, sprinkler heads, emitters, bubblers, valves, controls, control wiring, fittings and necessary accessories in all respects and in accordance with the project documentation.

B. This also, includes maintenance for a period of 365 days from the certified

substantial completion date.

RELATED DOCUMENTS

A. The following sections of the specification shall be read in conjunction with this section.

Section 02850 Irrigation Systems Ongoing Operations & Maintenance. Section 02900 Landscape Soft Works. Section 02920 Nurseries & Plant Procurement. Section 02950 Ongoing Landscape Maintenance Section 02960 Hard Landscape Works Section 02970 Ongoing Hard Landscape Maintenance Section 02990 Existing Vegetation

STANDARDS

The British Standard (BS) and other International Standards (ISO) and codes of practice referred to in this specification are listed below and reference shall made to the latest editions of these, together with all current amendments and additions thereto current at the time of tender. Whenever, in respect of any British, a scheme of supervision and control is in operation, all materials required to comply with that standard shall be marked with BSI certification trade mark (The Kite mark). Where materials are required to comply with other British Standards, the contractor shall submit to the Engineer test certificates, furnished by the supplier or manufacturer of the materials, indicating compliance with the relevant British Standards.

BS 21 1985 Pipe threads for tubes and fittings where pressure-tight joints are made on the thread.

BS 543 1966 steel pipes, fittings and specials for water, gas and sewage.

BS 729 Hot dip galvanize.





BS 1387 Screwed and socketed steel tubes and tubulars and for plain end steel tube suitable for welding or for screwing to BS 21 pipe threads.

BS 1452 Grey Iron castings. BS 1972 Polythene pipe for (Type 32) for above ground use for cold-

water services. BS 2494 Materials for electrometric joint rings for pipe work and

Pipelines. BS 3416 1975 Black Bitumen coating solutions for cold water

applications. BS 3505 Unplasticised polyvinyl chloride (uPVC) pressure pipe for

potable water. BS 3900 Method of test for paints. BS 4027 1980 Sulphate resisting Portland cement. BS 4346 Joints and fittings for use with unplasticised PVC pressure

pipes. BS 4504 Flanges and bolting for pipes, valves and fittings. Metric series BS 5152 1974 Cast iron globe and globe stop and check valves for

general purpose. BS 5153 1974 Cast iron check valves for general purposes. BS 5155 Butterfly valves. BS 5163 Cast iron gate valves for waterworks. BS 5750 Quality systems. BS 8010 1987 Code of practice for pipelines. DIN 8061 General quality and testing of PVC-u pipes. DIN 8062 Dimensions of PVC-u pipes. ISO 161/1 PVC-u pressure pipe for potable water. ISO 4427 Polyethylene (PE) pipes for water supply.

ISO 9000 Quality management systems.

1.04 DEFINITIONS

1.05

Refer to the definitions in the General Conditions of Contract for Civil Works Contracts. The definitions apply to this general Specification for Landscape Irrigation Works.

QUALITY CONTROL

A. Prior to dispatch of any product and/or material from source the Contractor

shall notify the Engineer in writing in sufficient time to allow the Engineer the opportunity to inspect and test the product and/or material prior to delivery in accordance with relevant sections of the (GSCW) specification.

B. Products and materials shall be from a manufacturer/supplier who operates a

quality system that is registered to ISO 9000 series or approved equal. C. To allow the Engineer to inspect the Works the Contractor shall give the

Engineer a minimum of 24 hours notice of carrying out the activities on site. D. Hold & Witness points:





Do not proceed to complete further works until the following has been inspected and approved in writing by the Engineers Senior Inspector or approved representative: 1. Submission of works construction program. 2. Monthly progress reports. 3. Approval of all samples and materials 4. Marking out of pipe line route and valve location 5. Trenching and sand bedding. 6. Flushing the main line. 7. Pipe pressure testing. 8. Leak testing of laterals. 9. Flushing the entire section. 10. Installation of electric remote control solenoid valves. 11. Installation of dripper lines. 12. Installation of application devices. 13. Installation of controller. 14. Any soft landscape approvals (See section 02900 & 2950). 15. Detailed Maintenance Manual. 16. As Built drawings prior to PAC Maintenance work: 1. Endorsed or modified maintenance manuals. 2. Endorsed As Built drawings from Construction Contractor. 3. Monthly maintenance schedules. 4. Monthly maintenance records sheets. 5. Weekly maintenance schedules. 6. Weekly maintenance records sheets. The contractor shall notify the Engineer 48 hours prior to the inspection of the above. Such notification shall be given by a written inspection request (in a format acceptable to the Engineer) each and every time various areas of the work are to be carried out or covered up so as to prevent subsequent inspection. These activities shall be identified as hold points in the Contractors program and inspection and test plans. 1. If the Contractor does not notify the Engineer in sufficient time to allow

for his inspection prior to covering up or complete installations governed by a hold point, the Contractor shall remove all such materials / equipment as deemed necessary by the Engineer to verify compliance of the work.

2. Any delays, additional work or additional costs attributed to the above shall be at the Contractors expense.





1.06 SUBMITTALS

A. The Contractor shall submit to the Engineer the following documentation for review and approval before commencing work:

1. Existing Irrigation System.

The contractor shall locate and identify the existing irrigation system, electrical control and monitoring network, pumping stations and reservoirs within and feeding the project area and shall submit them as Existing Drawings for Engineers approval in a suitable scale agreed with the Engineer. These drawings need only to include down to the solenoid valves. The distribution lines and applicators beyond this are less important. The contractor shall then propose the suitable take off points for new irrigation system if not nominated or shown in the design drawing and the Engineer shall decide as to which pipe etc. are to be retained, relocated, removed or abandoned.

2. Irrigation Demand

After obtaining the final approved soft landscaping shop drawing and plant list, the contractor shall re-compute the water requirement for each irrigation circuit valve and submit to Engineer for approval.

Using updated data gathered the contractors irrigation engineer shall prepare water application schedule co-ordinated with the pump station available irrigation water, field satellite number, irrigation valve circuit number, cubic meter per hour discharge per circuit valve, number of hour/minute operation per circuit valve, and proposed time of operation for each valves. The contractor shall submit the schedules to the Engineer for approval.

3. Shop Drawings and Verification of Dimensions

The contractor shall carefully check and verify all dimensions on the contract drawings and shall report all variations to the Engineer. Both Imperial units and Metric units are used as appropriate, with strong preference for metric. All shop drawings shall be submitted for approval with supporting calculations prior to starting the work on site. Shop drawings shall be prepared to detail any installation not completely detailed in the contract drawings, or to detail any alterations to the contract drawings and shall include, but not be limited to:

1. Civil works, mechanical pipe work and electrical control equipment with circuit diagrams.

2. Details of mainline, lateral pipes and other typical connections. 3. Details of typical connections.





4. Wiring diagrams including conduits, pull boxes, sizing and calculations to verify that cable sizing is in accordance with valve manufacturers printed recommendations wherever applicable.

5. Electrical power and control wiring diagram system for irrigation controller, field wiring and grounding.

6. Details for drip line layout in shrub and ground cover beds and showing interface with planting layout.

The contractor shall remain responsible for maintaining the existing irrigation system in the contract areas and for any existing plantations until the new automatic system will be operational.

The approval of shop drawings shall not relieve the Contractor of any of his responsibility under the contract for a successful and timely completion of the work.

4. Materials and Equipment Schedules

Provide all catalogue cuts, diagrams, drawings, and such other data as may be required to demonstrate compliance with the specifications.

All materials shall be as described in the specifications. The contractor shall submit material approvals for all the materials, which are proposed to be used in the system, sufficiently in advance, to the engineer, prior to their installation. Any material used, which is not approved, shall be removed from the site and the contractor shall replace them at his own cost. 5. Installations and Testing. The contractor shall submit his proposed work method statement for approval prior to commencing work. The statement shall detail proposed sequence of work, hold points, testing frequency and document control.

6. Manufacturers Certification

6.1 PVC -u pipe Certification by a recognized certification mark scheme such as The Kitemark, or by an independent third party testing organisation approved by the Engineer, that production has been carried out under a system of supervision, control and testing applied during manufacture in accordance with BS 5750 / ISO specification or an approved equal procedure.

6.2 Valves and Special Steel Fittings

Manufacturer's certificate for pressure testing and coating, including holiday and dry film thickness (DFT) test reports for each valve, fitting, spool, if applicable.





6.3 Emitters

Certification of coefficient of Manufacturers variation

B. The Contractor shall submit to the Engineer the following documentation for

review and approval before substantial completion handing over.

1. Recommendation of the Manufacturer

The Contractor shall submit manufacturers recommendation for each material or procedure, including recommended spare parts to be utilised, and all relevant operational data. The Contractor shall have a copy of the manufacturers instructions available on-site at all times while work is in progress, and shall follow these instructions unless otherwise authorise to deviate by the Engineer.

2. Spare Parts

The Contractor shall submit manufacturers listing of spare parts for approval prior to commissioning any piece of equipment. Recommendations shall include stocking recommendations; exploded assembly diagrams illustrating location and spare parts to be utilised and all relevant operational data.

3. Manufacturers Literature

At such time as the Engineer has approved the list of materials, the Contractor shall provide four (4) sets of manufacturers technical and maintenance literature to the Engineer. Data sheets shall provide sufficient technical information to identify each product and shall include the name and the address of the nearest supplier and details of the local representative. Preformatted Technical Data Sheets for all approved irrigation items are maintained by the ADM Irrigation & Landscape Section and maybe submitted for this purpose.

4. As Built Drawings

The contractor shall maintain one set of As Built drawings. All approved changes and all completed and approved work shall be recorded on these drawings. The contractor shall maintain these drawings on a daily basis. At Substantial Completion the contractor shall submit to the Engineer the complete As Built set of drawings for approval and the final approved set shall be submitted within 14 days of Handover. Once the drawings have been approved the contractor shall prepare and submit 3 nos sets of fully book bound drawings and 1nos. soft PDF copy on CD with scanned literature as necessary at final completion handing over.





5. Operation and Maintenance Manuals

a. The contractor shall submit to the Engineer two sets of the draft 365-days

Establishment Maintenance Manuals for approval 14-days prior to substantial completion.

b. The contractor shall submit to the Engineer for approval two sets of draft

Ongoing Maintenance Manual 14-days before final handing over. The Manual shall have 4 parts:

Part. 1. - Pumping Station and Reservoir Ongoing Maintenance. Part. 2. - Soft Landscape Ongoing Maintenance. Part. 3. - Irrigation System Ongoing Operation and Maintenance. Part. 4. - Hard Landscape Ongoing Maintenance

Note: This may vary depending on the project scope of works The contractor shall submit to the Engineer two sets of the draft Operation and Maintenance Manual for approval at Substantial Completion Handing Over. The final content of the manual shall be agreed with the Engineer but shall include the following:

1. Design basis of irrigation system. 2. A3 copies of As Built drawings. 3. Logic of operation of the systems. 4. Description of equipment:

Function, normal operating characteristics, and limiting conditions

Performance curves, data sheets, test reports, relevant catalogues and warranties

Complete nomenclature, illustrations, assembly drawings, diagrams required for maintenance and commercial number of replaceable parts.

5. Operating Procedures: Start-up, break-in, routine and normal operating instructions Regulation, control, stopping, shut down and emergency

instructions Summer and winter operating instructions Special operating instructions

6. Maintenance Procedures: Routine operations Guide to trouble shooting Disassembly repairs and reassembles Alignment, adjusting and checking

7. Valve charts and Irrigation valve operation schedule complete with controller station No., size, flows sequence of operation and operating time





8. Spare parts. List of recommended spare parts Names, contact numbers and addresses of spare part

suppliers. 9. Bill of Quantities of Material used in the contract.

Depending on the project scope of works this manual should be incorporated with Landscape soft works and other Landscape hard works maintenance as one complete volume. Once approved the Contractor shall prepare and submit three (3) sets of fully book bound manuals with original manufacturers technical catalogues, literature etc and 1nos. soft PDF copy on CD with scanned literature as necessary at final completion handing over. Note: Allow 14-days for Engineer's review of drawings and manuals.

DELIVERY, STORAGE, AND HANDLING 1.07

Delivery, storage and handling of products and materials shall be in

accordance with the manufacturer's recommendations, Section of the (GSCW) specification and the following provisions.

1. Delivery, storage and handling shall at all times be performed in

a manner to avoid product damage. 2. Only nylon slings shall be allowed for lifting products. 3. Products shall be stored off the ground on timber blocks of

sufficient size and spacing to provide adequate support. 4. Products shall be stored at site in a temperature, humidity etc.

environment as recommended by the manufacturer. 5. Products that are stored outside at site shall be stored under

cover to prevent ultra violet deterioration and as recommended by the manufacturer.

6. The Contractor shall inspect all products upon delivery to site and report any damage to the Engineer.

7. Any products damaged during delivery, storage and handling shall be marked by the Contractor and set aside.

8. Proposals for repair of any damaged products shall be submitted in writing to the Engineer for approval.

9. Any damaged products deemed unsuitable for repair by the Engineer shall be removed from site and replaced.





1.08 WARRANTY

1.09 COMPLIANCES

All work included under this section shall be warranted by the Contractor against all defects and malfunction of materials and workmanship for a period of one year from the date of final acceptance of the irrigation system. Should problems arise with the system during the warranty period the Contractor shall make all necessary repairs and / or replacements in an expedient manner at no additional cost to the Client.

Comply with safety standards and governing regulations for cleaning operations. Do not burn waste materials at site, or bury debris or excess materials on site, or discharge volatile or other harmful dangerous materials into irrigation or drainage systems; remove waste materials from site on a day-to-day basis and dispose of in a lawful manner.





PART 2

2.01 GENERAL

2.02

PRODUCTS

All equipments, fittings and accessories shall be suitably rated to comply with the

system design and operating parameters.

PIPES AND FITTINGS

A. High Density Polyethylene (HDPE) Pipes And Fittings HDPE pipes shall conform to ISO 4427, pipe grade PE 100 with SDR 17 and rated for PN 10. The normal outside diameter (ND) shall be in accordance to ISOR 161-1.

Characteristics of Resins for Polyethylene Pipes Resin Type - PE100

Melt Flow Rate (g/minute) MFI at 190OC and 5 Kg

0.16 to 0.7

Melt Flow Rate (g/minute) MFI at 190OC and 2.16 Kg

< 0.2 Oxidation Induction Time (minutes)

OIT in pure oxygen at 200 OC >15

Basic Resin Density (Kg/m3) for compression moulded plaques

> 941

Position of Knee in the 80 OC stress rupture curve black resins

> 10,000 hours

50 year strength at the 97.5% Lower Confidence Limit (LCL) MPa

>10

Elongation at break - percent >600 Environmental Stress Crack Resistance ESCR - hours

>1,000

Percentage of recycled polymer Not Allowed

All jointing shall be fully automatic butt fusion welding with stub flanges drilled to PN 16 and special restraint transition fittings at PE to metal connections. The system shall be restrained completely and no thrust blocks are required, except at locations where HDPE pipes are connected to unrestrained pipe systems. Fittings and bends shall be fabricated from PE 100 polymer of compatible material to that of the pipe. At special locations, but only after approval of the engineer, electro fusion joining will be allowed.





B. PVC-u Pipes And Fittings.

PVC-u pipe shall conform to ISO 161/1 and shall be class 16/class10 (as per BOQ). Pipes up to 90 mm nominal diameter shall have solvent welded joints and pipes of 110 mm and above diameter shall have rubber ring sealing. Rubber sealing pieces shall be fabricated from EPDM ( Ethylene Propylene Diene Monomer) or an approved equal material, and shall conform to BS 2494 1976 part 1. Base PVC-u used for the manufacture of pipes shall be virgin material, purchased from an internationally recognised manufacturer. Additives stabilisers and agents used to aid the manufacturing process shall not comprise more than 3.5% of the pipe material, by weight. Pipes shall be legibly and indelibly marked with the manufacturing standard, the manufacturers name, date of manufacture, nominal bore, and working pressure/class. Pipe shall be smooth from inside and outside and shall show no evidence of blisters, grooves or other extrusion marks. The contractor shall provide three samples of all size pipes of one metre in length for approval prior to installation of any plastic pipe. All PVC-u fittings shall be ISO/DIN specification and have a minimum rating of 16 kg/cm at 20 degree C. Fittings shall be suitable for use with the above specified pipes. Where PVC-u flanges are required these shall be drilled to NP16 as detailed in BS 7622 and BS 7772. All fittings above 160 mm shall be fusion bonded epoxy coated ductile iron or cast iron or flanged GRP. The contractor shall use only fittings that are approved by the Engineer. All nuts and bolts shall be stainless steel 316 grade.

C. Linear Density Polyethylene (LDPE) Pipe And Fittings.

Polyethylene pipe shall be manufactured from linear low-density polyethylene incorporating a minimum of 2.8% carbon black, properly dispersed and antioxidants in an amount not exceeding 0.5%. Working pressure shall be minimum 4kg/cm or more.

A random sample of drip pipes shall be subjected to the Teepol crack resistance test. The sample shall be immersed in a bath containing a solution of 10% Teepol and 90% water maintained at 50 degree C. The pipe should resist the solution without showing any fatigue or crack for a period of 150 hours.

Polyethylene pipes shall be legibly and durably marked with letters of minimum height 3mm. The marking shall be reproduced at intervals of not more than 1m. The following information shall be marked on the pipe.





a. The manufacturers name or registered trademark.

b. The type number and designation PE in the form TYPE 30PE as appropriate.

c. The class of pipe in the form CLASS IRRIG.

d. The nominal inside diameter and wall thickness.

e. Identification of place of manufacture. The manufactures code is

acceptable.

Polyethylene pipes shall be fixed intact to the ground using heat resistant stakes at every 10 mtrs and an automatic end flush valve shall be installed at the end of the line. Drip stakes shall be provided at each point of change in direction of drip line. All fittings for drip lines shall be compression type. The pipe for sprayers and quick coupling valve connections shall be as per BS 1972-67 class C. The fittings for the above pipes should be compression quick joint type with minimum 12 bar nominal pressure rating.

C. Steel Pipes and Fittings.

Steel pipes shall be used for all above ground installations and for some selected underground installations. Pipes shall conform to API-5L (American Petroleum Institute) schedule 80 or other equal and approved. Welded fittings shall be schedule 80 and weld neck. Flanges shall be in accordance with BS 4504 PN16. All bolts, nuts and washers used for flange assemblies, or integral with bolted couplers shall be of stainless steel A4-70. Pipes shall be coated by electrostatic fusion bonded epoxy to average DFT 150 microns or by fusion bonded plastic powder coating to average DFT 500 microns. Pipes and fittings shall be degreased, blast cleaned to a minimum standard of BS 4232 second quality (SA 2 ). Threaded steel pipe and fittings used for risers less than or equal to 2 shall be in accordance with BS 1387 designated medium thickness and galvanized in accordance with BS 729. Any galvanized steel pipe installed in contact with the soil shall be wrapped with at least two layers of an approved pipe wrapping tape. The wrapping tape shall extend a minimum of 100mm above soil.





2.03

2.04

2.05

PVC-U CEMENT PRIMER LUBRICANT AND TAPE

PVC-u cement and thinner shall be of the type approved by the Engineer. The solvent cement shall have a minimum working pressure of 16 bar and a tensile strength of 112 bar after 72 hours. The cement shall have heavy viscosity, medium cure speed, and clear color and be suitable for pipe diameters up to 315mm. The cement will conform to ASTM-D-2564-91 and be NSF/UPC approved. The primer shall be certified to contain a minimum of 25% THF and must meet ASTM F656. The pipe lubricant will be specially formulated to work with rubber ring joints and will be NSF approved. All cans of solvent cement primer and lubricant shall have labels intact and shall be stamped with the date of manufacture and shelf life. No cans with an expired shelf life will be permitted. Joints compound for threaded connection shall be PTFE tape or an approved equal thread sealant.

UNDERGROUND WARNING TAPE

Marking tape shall be laminated polyethylene and aluminium foil construction capable of detection by low output generator equipment. Tapes shall remain legible and colour fast in soil conditions at pH values of 2.5 to 11.0 inclusive. The tapes shall be of the type specially manufactured for making and locating underground utilities. The tape shall be not less than 150mm wide and shall have the phrase CAUTION IRRIGATION PIPELINE AND CONTROL CABLES In English and Arabic stamped in black letters and repeated at maximum intervals of two meters. Tape shall be terminated inside valve boxes to allow clipping of detector equipment to the tape. The tape shall be laid 300mm above pipeline.

THRUST BLOCKS

Thrust blocks shall be provided to anchor all mechanically jointed pipes. Heavy-duty polyethylene sheet shall be used to wrap the pipe at the point off contact between pipeline fittings and thrust block. Concrete shall be Grade Class B in accordance with the concrete specifications. Where manifolds and laterals pass under roads or paved areas and through foundations and walls shall be in ducts.





VALVES AND ACCESSORIES 2.06 A. Isolation Gate Valves.

All isolation gate valve sized 4 inches and above shall be ductile iron (to BS 2789) and conform to the following features:

Construction of valve to BS5163 with flange end connection to PN16 as defined in BS7772.

Internal non-rising stem with clockwise closing rotation. Valve opening and closing shall be with key and not with hand wheel. Stainless steel spindle and resilient seal wedge. Valve body test pressure (open gate) of 2700 kN/sq.meter. Valve seat test pressure of 1600 kN/sq.meter at 60 degree C. Internal and external fusion bonded epoxy finish, minimum thickness

300 micron. Stem cap to main body bolts to be recessed with silicon sealing. Wedge shall be stainless steel with EPDM coating. Sluice gate valves of diameters up to 3 shall be to BS 5157 series B1

class PN20 suitable for q working pressure of 9 kg/cm or above. The valves shall have BSP thread inlet and outlet connections. The body shall be forged brass, cast brass or bronze.

B. Quick Coupling Valve And Fittings.

The valves shall provide plug-in type, underground water outlets for the temporary connection of hosepipes. Connection and operation shall be by means of special coupler keys inserted into the valve throat. The valves and key are to be of the same manufacturer to ensure compatibility of the connection. Valve construction shall be red brass or bronze with a self-closing protective cover. The valve shall be a single piece design with single slot and stainless steel spring. The valve should have locking mechanism to vandal resistance. The valve shall have a maximum of 0.5 bar pressure loss at the rate of 3.2 lps. The internal part shall be removable for service. The keys shall be brass with machined shanks for a positive seal. Valves shall have 25 mm female pipe threaded connection and keys shall have 25 mm male connection. The valve and key shall be 25 mm bore with no size reduction. Swivel hose ELLs shall be of red brass or bronze construction used to connect to quick coupler keys so that hose can be turned a full 360 degree without breaking hose near the coupler key. The hose ELLS shall have a female pipe thread of 25 mm and a male thread of 25 mm.





C. Electric Remote Control Solenoid Valve Complete With Pressure Regulating Module.

The valve body and bonnet shall be constructed of heavy duty glass

reinforced nylon body and internal parts shall be stainless steel diaphragm made of nylon reinforced nitril rubber and provide for a positive seal between bonnet and body. Solenoid coils shall be encapsulated in moulded epoxy.

Valves shall be normally closed diaphragm type with slow opening and

closing action for protection against surge pressure. Actuation shall be by encapsulated type solenoids rated at 24 volts, 50 cycles, and 2.0 watts unless otherwise specified. Maximum pressure rating shall be not less than 200-PSI BSP inlet/outlet, solenoid plunger shall in co-operate with self-flushing type stainless or internal filter.

There shall be provision for manual open/close and flow control stem with

cross handle for regulating the flow. All valves shall be provided with a pressure regulator to regulate the pressure between 1 to 5 bar (within an accuracy of 0.35 bar regardless of upstream pressure). It shall provide full and accurate pressure capabilities irrespective of whether it is operated electrically or manually. The pressure measurement shall be possible via Schrader valve or integral pressure gauge. The pressure regulator shall be with a calibrated dial for setting the outlet pressure.

The valve shall be capable for pressure regulating electrical and manual

mode operation using external and internal bleeds. Valve shall be suited for dirty or treated sewage effluent water.

The valves shall be inline or angle configuration as per the requirements. The

valve construction shall be such as to provide for all internal parts to be removable from the top of the valve without disturbing the valve installation.

Only moulded PVC-u/Brass fittings shall be used with solenoid valve

assemblies.

1. Electrical wire for Solenoid Valves. All electrical wire for underground use shall be single core solid underground

feeder type insulated with a flame retardant thermoplastic compound, rated for 600 volts and direct burial. The cables shall be suitable for installation in the ground flooded with Treated Sewage Effluent (TSE) water having corrosive chemicals. Each solenoid valve shall be connected by a separate control cable from the irrigation Controller Unit (ICU) and a common cable shall be run connecting all the solenoids for return connection.

The insulation material shall be of low density and high molecular weight.

Insulation shall be suitable for maximum conductor temperature of 60 degree Celsius. Minimum insulation thickness shall not be less than 1.2 mm.





The cables manufacturers name or code, insulation type, gauge of wire and voltage should be marked at intervals of not more than 1m.

The contractor shall indicate valve number on each cable at both ends as well

as at splices. All the electrical wires should pass through PVC conduit pipes of size as follows:

1 to 6 cables - 32mm 7 to 18 cables - 50 mm 19 to 30 cables - 63 mm 31 to 50 cables - 90 mm Wire connectors at the solenoid valve shall accomplish with moulded

waterproof PVC plastic connectors. Joints shall be made up using copper crimps and a rapid hardening. Waterproof sealant, shall be used as recommended by the solenoid valve manufacturer.

Irrigation control cables shall be colour coded as follows: Common wire - Black Drip valve wire - Green Bubbler valve wire - Blue Spray valve wire - Red Sprinkler valve wire - Orange Spare wire - White 2. Wire Connectors All wire connections at electric remote valves and all splices of wire in the field

shall be made using wire connectors. The wire connectors shall be specifically designated to ensure waterproof underground wire connections. The connectors shall be under-writers laboratories listed water resistant wire connectors, rated 600 volts for PVC-u insulated copper wire with insulation temperature rating of 105C.

The connectors shall consist of precision moulded PVC base socket, moulded

sealing plug, wire crimping sleeve and shall be easily installed in the field to give a permanent waterproof joint by using for joint make-up.

3. Pull boxes

Pull boxes should be provided as detailed in the installation drawing at every 100 mtr and at each point of change in direction. Each electric remote valve should have a separate pull box beside the valve box.





D. Flush Valve Assembly

The contractor shall install where required and as shown on the drawings, flushing points consisting of gate valve, valve box, valve supports, gravel bed, 1.5 meters of polyethylene pipe coiled inside the valve box.

E. Air Release Valve

Air valve shall be of the double orifice type, rated a minimum working pressure of 16 bar. The air valve shall be for the following functions

Large volume of air release on pipeline filling. Vacuum relief in the event of pipe drainage. Air release under pressure when the pipe is operational

Automatic double orifice air valves shall be provided at all high points on the

pressure mains. Automatic air valves shall have non-corrosive floats in chambers with clear space ensuring blockage free operation. All components for the air valve actuating mechanism including lever shall be of stainless steel.

The body and cover of the valve shall be of ductile iron, SG-GGG50. Nozzles

with seals and actuating mechanism to be located in the removable upper plate connected to the valve body using stainless steel (grade 316/A4) bolts. Valves shall be coated with epoxy internally and externally to average DFT 300 microns for protection against corrosion of body components. All nuts and bolts shall be of stainless steel grade 316/ A4.

F. Pressure Reducing Valve

Pressure reducing valve shall be hydraulically operated, diaphragm actuated in globe pattern. The valve shall be designed to automatically reduce a higher upstream pressure to a constant lower down stream pressure. The valve shall be installed in the irrigation/supply main line inside chambers where possible pressure reduction is required as agreed with the Engineer. Pressure settings shall be accurate and repeated through out the flow range. The regulation action of the valve shall be controlled by and externally mounted pressure-reducing pilot. The valve shall close drip tight when the down stream pressure meets the pilot pointing. All sizes shall be equipped with a stabilizing devise to control smoothly at low flows. The main valve body and cover shall be made from 300 series stainless steel. The valve shall be with flanged ends. The diaphragm shall consist of non-fabric reinforced Buna-N rubber and shall not be used as s seating surface. The pilot shall be adjustable, bronze bodied direct acting, spring loaded and normally closed. The pilot shall be supplied with a stainless steel seat ring. Provide adequate clearance for valve servicing and maintenance. Install pressure gauges to monitor valve inlet and outlet pressure as agreed with the Engineer.





2.07 VALVE CHAMBERS AND VALVE BOXES

A. Valve Chambers

The isolation valve chambers shall be RCC chambers or as specified on the drawings. Contractor should submit shop drawings as per site conditions for approvals. The valve chamber covers shall be ductile iron medium duty and epoxy

coated. The word of IRRIGATION in English and Arabic should be casted on the covers. Valve chamber with depth more than 1.5m shall be provided with heavy duty GRP ladder 400mm wide.

B. Valve Boxes

Solenoid valves, isolating valves, flush valves and quick couplers shall be installed in an access box of sufficient size to permit ready removal of the valve inner assemblies without removing the box from the ground. Valve numbers and station numbers must be clearly marked inside and outside of the box with permanent paint or by using plastic tags. Valve boxes shall be composite service boxes constructed of high strength cellular foam ABS or HDPE plastic. The valve boxes should have additional ribbing to strength the chamber & to counteract the side loading pressures. The valve boxes shall be green colour and should have Ultra Violet resistance property. The valve boxes shall conform to the following ASTM standards

Properties ASTMTest Method

Value HDPE Value ABS

Tensile strength D-638 38 mPa 43 mPa Plexular Modulus D-790 104 mPa 172 mPa

Notched Izod Impact strength

D-256 0.11 kg-m/cm 0.05 kg-m/cm

Deflection Temperature

D-648 60 76 deg C 98 107 deg C

The valve box covers shall be labeled in Arabic and English. The valve box covers shall be lockable or bolt down as directed by the Engineer.

Valve boxes shall be with following dimensions (Top External Dimension):

Quick coupler 50 mm dia and below 254 mm dia round green colour

box with minimum depth 254 mm. Weight minimum 1.4 kg





Solenoid valves 40 mm dia and below 305 x 430 x 305 mm deep

rectangular green colour box. Weight minimum 3.5 kg.

Solenoid valves 50 and 75 mm dia, Air valve, isolating valve 100 mm dia and below 381 x 635 x 381 mm deep rectangular green colour box. Weight minimum 11.30 kg

For drip solenoid valve assembly with Y strainer 812.8 x 482.6 x

304.8 mm deep rectangular green colour box. Weight minimum 14.50 kg.

For pull boxes 254 mm dia round green colour box with minimum

depth 254 mm. Weight minimum 1.4 kg

Valve identification tags shall be made of brass or aluminium and a minimum of 75 mm x 50 mm. They shall be stamped with the valve function number size. The valve shall be similarly identified on the as installed drawings. Valve boxes to have a 2-year warranty confirmed by the manufacturer.

2.08 BUBBLER

A. Pressure Compensating Bubbler

The bubbler shall be a pressure compensating type capable of providing a consistent discharge rate of 0.02, 0.03, 0.06 & 0.12 lps at 2 to 5 bar pressure. Bubblers shall be constructed from UL stabilized engineering grade plastic. The bubbler assembly shall have a plastic inlet screen to protect the nozzle against clogging. The bubbler shall have a 15/21 inlet (FNPT) for connection to the piping system riser.

B. Adjustable Flow Bubbler

The full circle bubbler shall have a discharge rate of 0.09 lps at 2 bar pressure. The bubbler body and screen shall be constructed of plastic. The adjusting screw shall be of stainless steel. The bubbler shall have a 15/21 female threaded inlet. All performance data tests shall be conform to ASAE S 398.1 standard procedures. The bubbler shall have an inlet screen to protect nozzle against clogging, and adjusting screw, capable of shutting off the bubbler and regulating the flow.

C. Bubbler Stake

Stakes for bubblers shall be constructed from strong temperature resistant





Polypropylene plastic construction with protective stop collar and length shall be 300-mm. Double barb inlet shall accept 13mm ID polyethylene tubing and ensure a firm connection. Outlet for bubbler shall be external male thread.

D. Bubbler Riser

Riser for Bubbler shall be constructed from UV resistant thermoplastic materials for long life. It shall be one piece, black design with no extra fittings or adapters. It should be able to withstand pressure up to 5.5 bar and temperature up to 65 deg C.

D. Bubbler Pop-Up Bodies

The body and stem shall be constructed of high impact, corrosion resistant heavy duty plastic. The pop-up body shall have co-molded (or) separated wiper seal in the top cover constructed from EPR rubber in polypropylene base for cleaning debris from pop-up stem as it retracts into case to prevent from sticking up. Full sealing around the pop-up stem shall occur at 0.6 bar. The wiper seal form an integral part of the cap and shall not be detachable. The riser shall have a strong stainless steel retracts spring for positive pop down. Pop-up height shall be not less than 10.2 or 30.5 cm as required. The sprinkler shall have a screen under the nozzle to protect it from clogging and for any removal of cleaning and flushing system. The sprinkler shall have 15/21 threaded inlet. The sprinkler shall have a built in check valve to prevent low head drainage. If the elevation is above 3.0 m, use check valve. The pop-up shall have a ratcheting mechanism and a full flow inlet unit.

EMITTERS 2.09 A. Single Outlet Pressure Compensating Emitter

Emitter shall be the single outlet fully pressure compensating type capable of providing constant discharge over the pressure range from 0.35 to 4.2 bar. The flow rates available shall be 4/8/16/24 lph. The emitter shall give a constant flow rate for temperature up to 60C. Each emitter shall have dual flow regulations utilizing both turbulent flow labyrinth and EPDM diaphragm. The complete unit must be resistant to standard agricultural chemical/fertilizers and withstand UAE environmental conditions. The labyrinth shall give the emitters large path and works at pressure below 0.35 bar. So no emission spikes occur at low pressures. The diaphragm shall free floating and controls the emission flow rate from 4.2 bar. The emitter shall be continuously self-cleaning. The emitter shall have built in filtration system in the inlet barb.





The emitter shall have a barbed inlet and nipple outlet to accept 4mm micro tube. The outlet shall have a baffle to deter insect entry. The coefficient of manufacturing variable shall be less than 0.05. All emitters shall be stamped with the manufacturer name, product type and flow rate.

B. Pressure Compensating Dripper Line (In-Line)

The dripper line shall be manufactured from linear low-density polyethylene (LLDPE) with pressure compensating emitters factory installed to the inside of the tube at selected intervals. The working pressure shall be minimum 4 kg/cm. The pressure compensating emitter shall consist of dual regulation utilizing both turbulent flow labyrinth and EPDM diaphragm. The dripper shall be continuously self-cleaning. Pressure compensation shall be between 0.35 to 4.2 bar and the flow must remain constant at temperature varying from 0 to 60 deg. C. The coefficient of manufacturing variability must be less than 0.04 as determined by an independent organization. The dripper line must be guaranteed against solar damage for 7 years. The dripper line shall be able to be installed with the dripper in any orientation. Temperature up to 60C shall not affect the dripper flow rate. The dripper shall have a large water path outlet that acts as a mechanical barrier to root intrusion. The drip line shall have an inside diameter of 13.6mm and in dripper flow rates of 2 or 4 lph as agreed with the Engineer. Pressure compensating dripper line spacing shall be 30, 50, 70 or 100 cm. Minimum 7 years continuous testing in sub-surface application by an independent organization is required. Pipes shall be fixed intact to the ground using heat resistant stakes at every 5 mtrs and an automatic end flush valve shall be installed at the end of the line. Drip stakes shall be provided at each point of change in direction of drip line.

The maximum length of the pipe to one side shall be based on the manufacturers recommendation.





2.10 SPRINKLERS

A. Spray Head Pop Up Sprinkler The sprinkler body, stem, nozzle and screen shall be constructed of high impact, corrosion resistant heavy duty plastic. The sprinkler shall have co-molded (or) separated wiper seal in the top cover constructed from EPR rubber in polypropylene base for cleaning debris from pop-up stem as it retracts into case to prevent sprinkler from sticking up. Full sealing around the pop-up stem shall occur at 0.6 bar. The wiper seal form an integral part of the cap and shall not be detachable. The sprinkler shall have a matched precipitation rate (MPR) plastic adjustable arc nozzle with an adjusting screw capable of regulating the radius and flow. Nozzles shall be removable to allow for pattern change and easy maintenance. The sprinkler shall have a strong stainless steel retracts spring for positive pop down. Pop-up height shall be not less than 10.2 or 30.5 cm as required. The sprinkler shall have a screen under the nozzle to protect it from clogging and for any removal of cleaning and flushing system. The sprinkler shall have 15/21 threaded inlet. The sprinkler shall have a built in check valve to prevent low head drainage. If the elevation is above 3.0 m, use check valve as per specification clause 2.10-E. The sprinkler shall have a ratcheting mechanism and a full flow inlet unit shall come complete with a flush plug and nozzle. The full and part circle pop-up spray type sprinkler shall have the following performance specifications at 2 bar operating pressure. Adjustable arc nozzles from 1 to 360 or fixed arc nozzle of full circle, half circle and quarter circle shall be installed depending on the site condition.

Spray pattern Pressure in Bar And Radius in M

Discharge in LPS

Full 2 5.00 0.30 Half 2 5.00 0.18 Third 2 5.00 0.20

Quarter 2 5.00 0.22 Full 2 4.50 0.23 Half 2 4.50 0.12 Third 2 4.50 0.18

Quarter 2 4.50 0.06

Full 2 3.65 0.18 Half 2 3.65 0.09 Third 2 3.65 0.13

Quarter 2 3.65 0.04





The part circle pop up rotator shall have an infinitely adjustable arc between 900-2100 or between 2100-2700depending on the model selected. The full circle model shall irrigate 3600. Full or part circle model shall be capable of up to 25% radius reduction using a stainless steel radius adjustment screw on the top of the nozzle. The radius reduction screw shall have a slip clutch mechanism to prevent internal damage if turned past the minimum or maximum radius settings. The radius reduction screw shall reduce the pressure and flow upstream of the nozzle there by maintaining the stream integrity.

Full 2 3.00 0.10 Half 2 3.00 0.50

Quarter 2 3.00 0.02

Strip Nozzle

L X W

Discharge in LPS Square 2 7.0 x 7.0 0.23

End strip 2 1.2 x 4.6 0.04 Center strip 2 1.2 x 9.2 0.08 Side strip 2 1.2 x 9.2 0.08

B. Matched Precipitation (MP) Rotator

The pop up rotator shall produce and maintain a matched precipitation not greater than 15mm per hour throughout the arc and radius adjustment range and it shall be of viscous fluid brake rotary type and produce multiple streams. The full or part circle pop up rotator shall be capable of covering 2.5 9m radius at 2- 3.75 bar with a discharge rate of 0.036- 0.964 m3/hr.

Part circle rotator shall have arc adjustment capabilities using a stainless steel ring at the top edge of the nozzle. The adjustment ring should be effective only while the sprinkler is popped up and should be ineffective while the sprinkler is popped down. When turned past the minimum or maximum arc limits the adjustment mechanism shall have a slip clutch action to prevent internal damage. The pop up rotator shall have a pop up that occurs approximately 15 psi of water pressure. Upon cessation of water pressure, the sprinkler shall pop down.

The pop up rotator shall be able to be installed in 5/8-27 male threaded pop up spray head bodies of nominal pop up height 2,3,4,6 or 12/ adaptor or having 5/8-28 female threaded pop up spray head bodies of nominal pop up heights 2,3,4,6 or 12/ adaptor. The pop up rotator shall be fitted with detachable filter stem and nozzle orifice shall be manufactured from urethane for durability





C. Pop-Up Sprinkler

The sprinkler shall be of the gear driven rotary type, capable of covering 4.0 to 10.0 foot spacing at 2 to 3.5 bar. The sprinkler shall include a set of five (5) interchangeable nozzles and be available interchangeable nozzles discharging from 0.09 to 0.21 lps.

The sprinkler shall be available in an adjustable part circle configuration. The adjustable part-circle unit shall be minutely adjustable from 40 to 360. The adjustable unit shall be adjustable in all phases of installation i.e. before installation, after installation (static), and after installation while in operation. The pop up versions of the sprinkler shall have a ratcheting riser assembly for final arc orientation. The sprinkler shall have a 10.2, 15.2, or 30.5 cm pop-up stroke. The pop-up sprinkler shall have a built in check valve to prevent low head drainage, and be capable of checking up to 2 m of elevation change. If the elevation exceeds 2 m, use check valve as per specification clause 2.10-E The sprinkler shall have an exposed surface diameter of 5.7 cm after installation. The sprinkler shall have a 15/21 female threaded inlet. The sprinkler shall be serviceable after installation by unscrewing the body cap, removing the riser assembly, and extracting the inlet filter screen. The body and the riser of the sprinkler shall be constructed of non-corrosive, heavy duty plastic. The sprinkler shall carry a two-year warranty.

D. Heavy Duty Gear Driven Sprinkler

The sprinklers shall be of the gear driven, rotary type, capable of covering a 6 to 14m radius at 3.4 bars with a discharge rate of 0.35 lps. The sprinklers shall be available with eight (8) standard nozzles discharging from 0.06 to 0.52 lps or four (4) low angle discharging from 0.1 to 0.30 lps. The sprinkler shall have radius adjustment screw. The sprinkler shall have a provision to enable the user to stop the water flow through an individual sprinkler head. The sprinkler shall be available in both full circle and adjustable part circle configurations. The adjustments part circle unit shall be minutely adjustable from 40 to 360. The adjustable unit shall be adjustable in all phases of installation. (i.e. before installation, after installation while static, and after installation while in operation). The sprinkler shall have a minimum of 10.2 cm pop-up stroke to bring the rotating nozzle turret into a clean environment. The sprinkler shall have a rubber firmly attached to the top of the sprinkler riser. When specified the sprinkler shall have a cover molded of purple Acryl rubber to indicate the use of reclaimed water.





The sprinklers shall have a built in check valve to prevent low head drainage and be capable of checking up to 10 feet in elevation change. If the elevation exceeds 10ft, use check valve as per specification clause 2.10-E. The sprinklers shall have an exposed surface diameter of 4.4 cm after installation. The pop-up sprinkler shall have an overall height of 11.4 cm. The unit shall have a 20/27 female bottom threaded inlet. The sprinkler shall be serviceable after installation in the field by unscrewing the body cap, removing the riser assembly, and extracting the inlet filter screen. The body and the riser of the sprinkler shall be constructed of non-corrosive, heavy duty plastic and nozzle-turret assembly shall be encased in stainless steel. The sprinkler shall carry a five-year exchange warranty (not prorated).

E. Pop-Up Sprays And Rotor Connection

The flexible connection between the irrigation sprays/rotors and the sub-main shall be via U.V stabilized class C low-density polyethylene (LDPE) pipe type 32 manufactured to BS 1972/67 3287. All pipes shall have size, class manufacturers name and standard printed on the product. Compression fittings shall be used for pipe connection to the sprays/rotor. The fittings shall have the body, locking ring, thrust collar and internal barb manufactured from master batch U.V stabilized polyethylene. The locking ring shall be manufactured from acetylic resin and rubber seal NBR material. The fitting shall have a pressure rating of 16 bar and shall secure the pipe with an external locking ring plus an internal push fit barbed adaptor. The two locking components shall be compressed onto the pipe to form a secure seal by the rotation of the locking nut. The final assembly shall have working pressure rating of 9-bar minimum and test pressure 16 bar pop-up sprays shall use class C and rotors shall use minimum class C polyethylene pipe.

F. Check Valve

The check valve shall be a spring-loaded adjustable valve constructed of corrosion resistant materials. The valve body shall be moulded of heavy-duty, U.V. stable, schedule 80PVC. The internal spring shall be constructed of 300 series stainless steel and the seal shall be constructed of EPDM material. The valve shall be available with female inlet with male outlet (or) female inlet with male outlet. The valve shall have an adjustment range of 4 ft to 32 ft (1.2m to 9.8m) of elevation. The adjustment shall be accomplished by turning the adjustment screw from the discharge side of the valve without taking the unit off the riser. The valve shall carry a two-year, exchange warranty (not prorated).





G. Big Gun Sprinkler

The big gun sprinkler shall be constructed from non-corrosive materials and easy hand adjustable stops for precise arc control. The Big Gun sprinkler drive shall incorporate a pressure and flow compensating drive spoon. A spreader nozzle for close in watch coverage shall also be incorporated as part of the drive arm unit. All the ball bearing shall be greased and sealed type. The Big Gun sprinkler shall be available with a fixed bore nozzle with female threaded body cap (or) an optional ring nozzle incorporating nozzle body an d seven interchangeable flow ring discs. The Big Gun sprinkler discharge shall be 24-degree trajectory. The Big Gun Sprinkler shall incorporate a key mechanism bolted to the base of the sprinkler, which shall be compatible for fitment to a mating quick coupling valve key. There shall be multiple size interchangeable nozzle choices and the nozzles shall be selected to match the required precipitation rates. Operating pressure : 3.0 to 7.0 kg/cm Discharge : 45.0 to 70.0 m/hr Radius of throw ; 28.0 to 58.0 metres The quick coupling valve shall be of heavy-duty cast iron body construction with stainless steel and brass internal components. The quick coupling valve shall have a 3 female BSP inlet and spring loaded diaphragm outlet compatible for use with bayonet type base connection on a mating quick coupling valve key attachment, which shall form part of the Big Gun sprinkler.

2.11 FILTERS A. Screen Filter Automatic self-cleaning screen filter shall be provided at the pump discharge

head, which are specifically designed for use with organic contaminants. Cleaning shall be effected by hydraulically powered suction scanner automatically activated when the pressure across the filter reaches 0.35 bar. The capacity of the filter should match with the system flow.

1. Primary stage filtration shall be performed by a one piece perforated PVC

coarse screen having circular holes of 9mm diameter.

2. Secondary stage filtration shall be provided by a stainless steel grade 316 with 200 mesh size (74 microns). Flushing line to be connected to an existing drainage manhole.

3. Filter shall be equipped with electrical control system contained in a Nema 4X

enclosure, which shall regulate the filter rinse cycles and prevent the filter





from engaging in a continuous rinse. The control system shall be microprocessor based and shall be suitable for control of up to ten (10) filters. The system shall provide for rinse cycle activation by one of four options: differential pressure, timer external signal or manually, and shall include an integral rinse cycle counter which shall record the rinse cycles activated by each method. The system shall include local alarm and remote contacts to indicate filter malfunction.

4. Filter shall have flush valve actuator of a heavy duty construction threaded

into a brass valve body.

5. The filter shall clean itself automatically without the need for an external energy source.

6. The filter shall provide uninterrupted flow and also provide filtration during the

flushing cycle.

7. Fine screen elements shall be easily replaceable without requiring any changes to be made in the construction of the elements of the cleaning system or the need to remove the filter from the pipeline.

8. Installation shall be possible in any desired position (horizontal, up-side down,

vertical or inclined).

9. Pressure drop across a clean filter screen shall not exceed 0.21 bar.

10. Filter shall have isolation valves in the suction as well on delivery side for easy maintenance. The controller for the filters shall be equipped with timer and pressure differential control unit.

11. Pressure gauges to be connected to suction and delivery side of each filter.

12. All nuts and bolts shall be of stainless steel grade 316 or A4-70. B. Media Filter The irrigation filter shall be automatic self-cleaning type, specifically

designed for use with organic contaminants. A hydraulically powered suction scanner, automatically activated when the differential pressure across the filter reaches an adjustable level, normally 5 PSI, shall effect cleaning.

The screen shall be stainless steel grade 316 with 200-mesh size (74

micron). Flushing line is to be connected to the soak pits or nearest storm water drainage manhole.

The control system shall feature a fail-safe timer to prevent continuous

flushing due to malfunction.





The control system for the filters should be such that it will not flush the filters if the pumps and /or irrigation system is not operating. Filters should flush only during the operating hours of the irrigation system.

One number in line filter of capacity 9.5 lps shall be installed. The filters shall have less than 0.18 bar pressure loss.

The screen area shall not be less than 274 sq.inch. Filter shall have gate valves in the suction as well as on delivery side for easy maintenance. The controller for the filters shall be equipped with timer and pressure differential control unit. Pressure gauges are to be connected to suction and delivery side of each filter. All nuts and bolts shall be of stainless steel grade 316 or A4-70. The filter body and internal parts including flanged connection shall be stainless steel.

C. Y Strainer

Body shall be constructed from high heat and chemical resistant glass reinforced plastic, two-piece threaded housing with o-ring seal molded.

Filter screen shall be stainless steel providing 60.8 sq.inch of filtration area.

Outer support shall be woven stainless steel wire and inner screen shall be woven stainless steel cloth. Inner and outer screens shall be soldered together. Screen collar molded from vinyl for long life and weather resistant. Screen shall be 150 mesh sizes.

The pressure rating shall be 10 bar. Working pressure shall be 7-8 bar. The filter should be available in 25, 40, 50 mm size and flow capacity of

each shall be 1.58,3.15,6.94 lps respectively. The whole filter unit shall be manufactured from the same manufacturer.

2.12 CENTRAL IRRIGATION CONTROL SYSTEM.

The central control station shall be available to satisfy the system requirements and shall be user friendly. The central computer shall communicate with the field controllers directly. Central Control and Monitoring Program shall use a strong protocol to exchange. This communication shall be direct real time. The control software shall be year 2000 compliant. The central control software shall allow remote access from different locations by means of dial-up telephone line for control and monitoring. Central controller software shall be easy to use and utilizes pointer mouse and single screen user programming functionality. That is, user definable selections for each area of operation are performed on a single at-a-glance windows screen. For example, each controllers watering schedule





program i.e. Water days, Start times, Station run times, Station flow rates, budgets etc. can be viewed and changed by viewing a single screen. The software screens mimic the user screens on the touch screen panel of each controller. Terminology and screen thought layouts in both the software and controllers make it much easier for an irrigation technician to operate both because of the consistency of design The central control system Software shall have the following minimum capabilities:

Support more than one project, True windows User Interface Allows printing of any report Allow Uploading of data and programs from Field Units Supports moisture sensor Paging Facility shall be supported and engineered by the system

manufacturer, sending alphanumeric messages. Flow prediction: To analyze the demand on the Hydraulic design. Complete Flow management by enabling flow sensor. Water Network protection Effective Water management using ET sensor Sensor Measurements. Comprehensive and User-friendly irrigation programming screens.

(Time based, quantity based and irrigation depth). Define multiple crop type and adjust water factor for each type. Off-Line programming for Field Units.

A. Surge Protection And Grounding

The central control system shall have a surge protection unit (SPU) to protect components from electrical surges, to be installed on the external wall of the computer room and to be grounded as instructed in the technical data sheet. Approved grounding of the SPU, to be provided for lightning/electrical surges with 8 grounding copper rods as per ADEWA regulations.

B. E.T. Sensor

The E.T. Sensor shall be compatible with the Irrigation Central Control System and automatically provide data to the central computer to analyses the current irrigation requirements for optimal water management. The E.T. Sensor shall automatically monitor meteorological conditions that affect water consumption. The central computer calculates Evapotranspiration (ET) by modified Penman equation from above parameter inputs (excluding wind direction), and then adjusts the irrigation schedule of each program.

C. Field Controller





The central control system shall be responsible for the monitoring of the equipments under contract scope of work and override local control with manual commands locally from controller or central. All these controllers shall be field programmable. The Controllers shall be intelligent device, Modular and Expendable units and capable of processing local control. It shall control and monitor the pumps, valves and flow sensors connected to it.

The Controller shall be smart and have the intelligence to accumulate data and make decision locally. Comprehensive standard application development and diagnostic program shall be used for programming the controller locally or remotely. The Irrigation central Control System shall use a solid communication protocol allowing real time, two-way communication with the central and controller. The communication shall be direct with central.

Central controllers shall contain full data processing, program intelligence and communication capability and do not require added hardware or modification to link field controllers to the central base. The basic central system architecture communicates to and from the base PC via point-to-point, point-to-multipoint, point-to-point repeater or point-to multipoint repeater with total functionality being available in each standard controller unit. A multitude of communication options exist that minimize cost yet increase range potential. The Controller shall be installed in a weatherproof enclosure equivalent to 1P55 standards. The controller shall have solid-state design utilizing touch screen/ liquid screen display. The processor module (CPU) shall be real time process controller and shall support the Data transfer with I/O modules, system memory allocation, and communication port protocol. The CPU shall have 2 nos. of 9 DB communication port for allowing LAN capabilities. The Controller shall be supplied with required number of Input / Output points and shall include the following minimum configuration:

1) Mother Board 2) Input /Output (I/O) modules or Boards. 3) Power supply 4) Radio Communication Interface. 5) Combination of radio, telephone & hardwire board.

The field controller shall have independent control over each station start time (up to eight), duration of watering (maximum 99 hours, 59 minutes, 59 seconds), days of operation and cycle length (I to 30 days), exempt station operation by day of week or by date. .A mimic function shall provide the ability to copy station timing to any other station. The Controller must operate at ambient temperature range of 30 to 60 deg C with relative and humidity up to 95 %.





The Controller shall carry irrigation programs with the following minimum capabilities and requirements per irrigation main line:

Control Irrigation system based on time and quantity. Initiate alarms based on high flow, low flow, main line leak. Flexible programming to change valve set combinations. Possibility to create programs based on conditions. Run/Stop main line. Local or host control may be initiated at the keypad along with

satellite address. Universal water budget may be modified from 1% to 300% in one

percent steps. Individual station programs or all programming may be erased

through a two-step process. A security code can be entered allowing only authorized access to

programming functions. Four windows of irrigation for more flexible operation.

D. Moisture Sensors

Moisture sensors (upto eight) shall be connected to the satellite via a two wire path or use existing valve wires (one sensor per path) and shall automatically modify or skip any station. The user shall be able to assign any station to any sensor. The controller shall have local override capability.

E. Flow Meters Flow meters (up to two) shall automatically shutdown and bypass any station in the event of a flow variance (either excess or sub normal as defined by the user). The satellite shall shutdown the master valve in the event that flow variance cannot be corrected by an individual station shutdown. Controller shall have local override capability.

F. Other Sensors Other types of sensing (up to eight) such as rain, wind speed and direction, temperature, evapotranspiration/humidity, etc. shall be connected to the satellite via a two wire path (one sensor per path) and shall automatically modify or skip any station. The user shall be able to assign any station to any sensor. The controller shall have local override capability. The controller shall have the ability to automatically calculate and adjust watering times based on evapotranspiration. The controller shall be able to detect leaks and report to the main controller and shut the system if the leak is continuous. The central controller shall display projected flow by program using graphics. The graph will calculate and display the maximum instantaneous flow as well as the total volume. Maximum flow and volume





will be displayed in user-selected units. Graphs may be displayed for a flow source, for all selected programs or for an individual field controller.





PART 3

3.01

EXECUTION

DESIGN CRITERIA

A. Watering Requirements

For the purpose of the design the Peak Irrigation Requirement (PIR) of landscape plants are to be considered as follows:

Requirement Plant Type

l/m2/day or l/day

Groundcover 10

Grass /Lawn 12

* Feature Plants 10 20

Shrubs 20

Small Trees 40

Large Trees 80

Other Palms 80

Date Palms 150

* Feature Plants = Depending on the specific needs of the feature plant species

B. Application Devices It is recommended to use the application devices as follows: Palms and Trees - Pressure Compensated Bubblers Shrubs - Pressure Compensated In-Line drippers Ground covers - Pressure Compensated In-Line drippers Grass - Spray Head or Rotors

3.02 INSTALLATION PROCEDURE

The Contractor shall carry out the works according to the following sequence or as agreed with the Engineer.

Marking out of pipe line route and end valve locations Trenching and sand bedding Installation of mains, sub main and control valve take offs Installation of isolation valves





Pipe pressure testing for main and sub main Installation of manifolds and laterals Backfilling Lateral pipes system leak test Installation of electric remote control solenoid valves Flushing of the system Installation of irrigation heads Installation of controllers Final testing and commissioning

3.03 EXCAVATION

Prior to trenching all services crossing or running close to the line of the trench shall be identified and exposed. In addition the line of the trench shall be swept using an approved detection device, capable of detecting both live and dead cables.

Trenches shall be made as narrow as practicable, but not less than the pipe diameter plus 300mm, and shall provide sufficient room for laying, jointing and testing. The width of the trench at the crown of the pipe shall not exceed the pipe diameter plus 600mm.

Sheeting, bracing and shoring shall be used to provide for the safety of all personnel for all trenches.

The trench bottom shall be composed of stable uniform sand with no protuberances that might cause point loading of the pipe. The trench formation shall be trimmed to an even finish, which will provide continuous support for the pipe. Additional excavation shall be carried out at the position of the pipe socket to ensure proper joint assembly and pipe support. If the existing formation is unsuitable for pipe laying, pipes shall be laid on a bed of imported sand 100mm thick (minimum). This sand may be sourced from sieved excavated material, but should not contain any particles larger than 5 mm, and should have good self-compacting properties.

De-watering should be provided (if necessary) to remove any surface or ground water entering the excavations. Ground water level shall be maintained at least 300mm below the bottom of each excavation.





The trench should not be excavated more than 3 days prior to pipe laying.

For the main pipe, trench depth shall be 1000mm from crown of the pipe to the finish grade. For the lateral pipe the depth shall be 600mm.

Mainline and control cables will be allowed to be laid in the same trench with only one lateral line and to be at different levels.

Pipes shall be centre loaded leaving joints exposed within three days of laying.

3.04

3.05

BACKFILLING

Initial backfill shall be by hand in 300 mm lifts and carried in such a manner to ensure adequate support under the pipe and distributed evenly to ensure there are no voids under or to the sides of the pipe.

For pipe sizes of 90 mm dia. and below Backfill material shall be clean sand and

shall not contain any particles larger than 5 mm. Backfill shall be placed in 300mm lifts and consolidated without mechanical compaction by flooding the trench with irrigation water.

For the pipe sizes 110 mm dia. and above, backfill material shall be deposited in 300mm lifts in general areas and compacted to 90% (by water tamping or by any other approved method). In paved areas lifts shall be 150mm and backfill shall be compacted. Mechanical compactors shall not be used until there is a minimum of 300mm above the crown of the pipe.

Backfill material shall be sand and shall not contain any particles larger than 25mm for the first 100mm above the pipe, thereafter backfill material shall contain no particles larger than 50mm. Whenever ambient temperatures exceed 35 degree c

section 02800 - irrigation systems

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