method statement of internal trays, packing & catalyst loading

NGHI SON REFINERY AND PETROCHEMICAL PROJECT

Document Title :METHOD STATEMENT OF INTERNAL TRAYS, PACKING & CATALYST LOADING

Contractor Doc. No:VV3160-001-C-024 REV – 0

METHOD STATEMENT FOR INSTALLATION OF INTERNAL TRAYS, PACKING & CATALYST LOADING

DOCUMENT CLASS: X

0 14 - Nov - 2014 Issue for Approval

Rev. Date Description Prepared by Checked by Approved by

Responsible Company Prepared by: Checked by: Approved by:

WEC Nava Nava

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Issue Purpose For Approval




TABLE OF CONTENTS

1. SCOPE 3

2. PURPOSE 3

3. REFERENCES 3

4. ORGANIZATION & RESPONSIBILITIES 4

5. EQUIPMENT 6

6. LIFTING CATEGORIES 7

7. INSTALLATION SCAFFOLDING FOR ACCESS 11

8. PROCEDURE 12

8.1 Site Planning and Arrangement 128.2 Internal Tray, Inspection and Acceptance 128.3 Handling of Internal Trays and packings 138.4 Internal Trays and packings Preparation 13

9. INSTALLATION 14

10. TRAY INSPECTION CRITERIA 14

11. PREPARATION 15

12 PROCESS CHECK LIST FOR COLUMN / VESSEL 17

13 MISCELLANEOUS INTERNALS 20

14 PACKED COLUMNS 20

15 DISTRIBUTORS 21

16 GENERAL APPEARANCE 21

17 REPORT 21

18. PUNCH LIST 21

19. CATALYST LOADING PRECAUTIONS 21

20 CATALYST LOADING 21

21. FINAL LEAK TEST 22

22. ATTACHMENT 22

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1. SCOPE

This method statement contains the general requirements for the installation of Internal trays, packing & catalyst loading.

2. PURPOSE

This document is established to outline general procedure and implementing effective activities for installation work of internal trays, packing and catalyst loading. This provides guidance includes addressing programs for :

- Implementing commitments regarding the efficiency and quality with the safe of work.- Managing and providing oversight to ensure installation with explain step by step whole of activities accordance standard code and related document.

3. REFERENCES

3.1 JGCS Documents:

- S-000-1654-0001V Construction HSE plan

- S-000-1654-0002V HSE audit and inspection plan

- S-000-1654-0100V Job safety analysis (JSA) & safe work method statement

- S-000-1654-0110V START program procedure

- S-000-1654-0120V Incident management plan

- S-000-1654-0130V Emergency response plan.

- S-000-1654-0160V Spill Contingency Management Plan.

- S-000-1654-0200V Permit to Work Procedure

- S-000-1654-0240V Person Protective Equipment (PPE) Procedure

- S-000-1654-0400V Scaffolding Procedure

- S-000-1654-0405V Site Barricades

- S-000-1654-0410V Tools and Portable Powered Equipment

- S-000-1654-0425V Mechanical Equipment and Heavy Equipment

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- S-000-1654-0430V Electrical work procedure

- S-000-1654-0500V Excavation Procedure

- S-000-1654-0510V Working at Heights

- S-000-1654-0520V Confined Space Entry

- S-000-1654-0530V Lifting and Rigging Operation

- S-000-1654-0540V Welding and Cutting

- S-000-1654-0545V Radiography Procedure

- S-000-13A0-0001V Specification for Painting

- S-000-1635-0003V Equipment Protection during Construction

- S-000-1654-0001V Worker's Occupational Health and Safety Management Plan

- 3550-8710-SP-0003HSE Instructions To Contractors

- 3550-8150-PR-0001 Project HSE Plan: Environmental Plan

- 3550-8150-PR-0002 Project HSE Plan: Health and Safety Plan

- 3550-8710-PR-0001 Mechanical Completion Requirements

- 3550-8710-PR-0004 Emergency Evacuation Requirements

- 3550-8820-TN-0009 Guidelines On Application Of Mandatory Vietnamese Standards/Statutory Regulations.

3.2 The vendor’s manual shall have the first priority. All the internal trays and packings shall be installed accordance with installation instruction and procedure given by the internal trays and packings manufacturer.

3.3 If any conflicts or question for among this specifications, the specifications for installation shall be refered to client and owner of resolution.

3.4 Manufacturer’s installation standard

3.5 Installation drawings.

4. ORGANIZATION & RESPONSIBILITIES:Internal trays and packing installation work organisation shall be headed by project Manager supported by whole of people involved in site key personnel construction organisation below.

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4.1 Organization Chart:

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Site Manager

Construction Manager

Field Superintendent

Field EngineerSafety managerQC manager

Lifting SupervisorQC Engineer

TPI & Subcon

Safety Officer Field Supervisor Scaffolding contractor

Crane operator

Signal man

Rigger

Safety Coordinator Mechanical Fitter

General worker

Mechanical Fitter




4.2 Responsibilities

Site Manager: Responsible for ensuring that all works are performed in accordance with this procedure.

Construction Manager:Responsible for the overall planning, coordination and control of theinstallation activities

Field EngineerResponsible for field installation work implementation and maintaining acceptable quality standard

Field SupervisorResponsible for the actual checking of the work, Give Instructionwork control for ensuring all activities during installation work done safely.

Field Superintendent

Responsible for the actual performance of the Installation crew andactual checking of the work Progress to make sure that it is drawing specification and standard & in accordance with established safe work practices.

Safety OfficerResponsible for monitoring that all activities are carried out in asafety manner and compliance with the established safety procedure.

Quality Control

Responsible to monitor and inspect the erection and installation activities ensuring it is being done in compliance with this procedure, ITP (Inspection and Test Plant), Drawing, Project specification and other reference standard document and procedure.

Crane Operator To operate crane in safely manner and under guidance by signal man

Scaffolder To build scaffolding for access worker to installation equipment.

Signalman To guide crane operator during lifting work

Rigger To do rigging work under supervision rigging foreman

MechanicalFitter/Millwright

To do Fit-up work under supervision mechanical

General Worker To do mechanical work under supervision

5. EQUIPMENT:

All equipment required will mobilize, included listed as follows :

- Calibrated Inspection Tools/Instruments - Steel plate for crane (defend on crane size)- Crane (to be finalized and mut have approved lifting plan)- Forklift

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- Crawler and Hydraulic cranes to be used- Lifting Gears Accessories- Mechanical hands Tools- Scaffolding materials - Electrical hand Tools

6. LIFTING CATEGORIES

Prior to Lifting Works, it must have an approved Lifting Plans. Which indicate the type of cranes & lifting gears accessories indicated. The lifting plans must be followed during all lifting works.

To Provide safely work when erection static equipment, there are consideration which take according to weight of the equipments. The lifting categories are shown on list below:

WEC shall employ an experienced, competent and responsible Lifting Engineer to plan and review lifting operations. Duties shall include the review and approval of lifting studies provided by specialist heavy lift crane subcontractors. The Lifting Engineer shall also be responsible for providing other heavy lift studies.WEC shall develop a lift classification schedule identifying all lifts and studies required for each lift. The method of review by the Owner or Owner’s representative shall be agreed with the Contractor. All loads greater than 200t shall be submitted for review by Owner/Owners representative. Lift studies will be based upon using a maximum of 90% lifting capacity of the intended crane to be utilised.B16 shall produce and maintain a project specific Lifting Study Schedule. Thisshall be initiated, distributed and maintained by the WEC’s Lifting Engineer and shall incorporate a listing of all classified lifts.Lifting studies shall be carried out by the WEC or specialist subcontractor for all loads greater than 50t (as a minimum requirement).

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7. INSTALLATION SCAFFOLDING FOR ACCESS

- Erect scaffolding based on sufficient structural integrity to ensure a safe working

environment, including anticipated wind force and soil bearing capacity of the location of

erection. Comply with Scaffolding Procedure of JGCS.

- Only trained and experienced personnel for erection and dismantling of scaffold, and aware of

all safety requirements.

- Tag of scaffolding and control system shall be used to erection and dismantling of scaffold

structures,for dislpaying the status of erected structures, as per the scaffolding procedure of

JGCS.

- Pre assembled scaffold on the frame for erection pupose would be inspected by certified

scaffolding and shall be inspection by JGCS prior to use.

- Scaffolding tubes will be used as life lines, for erection purpose if necessary.

- Scaffolding would be arrange, like skecth drawing below and right angle, end to end coupler

shall be used for joined tubes.

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8. PROCEDURE

8.1 SITE PLANNING AND ARRANGEMENT

8.1.1 The QC department representative should inspect all towers before and after the internals are installed, (to avoid discussions about causes of attained out of tolerances after installation of internals)

8.1.2 It is a standard company requirement that in addition to WEC erection crew, vendor’s process representative should inspect such towers at the earliest oppurtunity. Possible non-conformance with the design requirements may thereby be identified, and remedial action taken as necessary.

8.1.3 Inspection by WEC erection crew and vendor’s process representative is necessary to ensure that the tower has been correctly erected. Additionally, inspection on site for ‘non-conformance with design requirements’, should be a formality if the tower was carefully inspected by the JGCS representatives, prior to release from the manufacturer.

8.1.4 JGCS operations representative is invited to be present during this tray inspection.

8.1.5 Vendor’s process manager may waive the requirement for a process inspection by agreement with the WEC project manager or construction manager.

8.1.6 Before lifting internal trays and packings, the job site shall be thoroughly surveyed and the activity carefully planned, taking into consideration following items.

Equipment Shape, Dimension, Weight, Material, center of Gravity as well as confirming the lastest vendor drawings information to riggin plan.

8.1.7 Checked crane Swing radius, crane movements and work space arround the lifting area.

8.1.8 List of temporary equipment and tools to be prepared.

8.2 INTERNAL TRAY INSPECTION AND ACCEPTANCE

8.2.1 All internal trays and packings received at site shall be inspected in accordance with vendor’s instruction for site storage, installation and preservation.

8.2.2 Internal trays and packings shall be off loaded from trailer using the vendor recommended lifting point and approved techniques.

8.2.3 All loose items that are not required for immediate installation shall be suitably identified and retained in the stores.

8.2.4 Protective covers on all equipments shall be removed if they appear damage and equipment inspected before replacing the cover, if any damage has occurred, Discrepancy report shall be issued with photograph showing damages as necessary.

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8.2.5 Preservation for equipment will be maintained during storing period by observing on weekly basis.

8.2.6 Record results of the inspection for documentation.

8.2.7 If identifying any discrepancies shall be reported to JGCS.

8.3 HANDLING OF INTERNAL TRAYS AND PACKING

8.3.1 The internal trays and packing shall be unpacked in the presence of QC Inspector and Site representative or vendor representative. All spare parts and tools shall be unpacked clearly marked with trays numbers and stored in the warehouse. The parts shall be clearly identified by the tags with trays number.

8.3.2 The trays and packings should not be placed directly on the earth, wooden blocks to be used.

8.3.3 After checking the internal trays and packings and confirming that there are no discrepancies, internal trays and packings shall be stored or delivered to installation site.

8.3.4 Bottom of the base plate shall be cleaned or wiped by suitable means to remove mud oil or grease before installation.

8.3.5 JGCS is responsible for advising the process representative when process inspection is to be scheduled.

8.3.6 JGCS or the process representative is responsible for asigning a process engineer to carry out the inspections.

8.3.7 The process engineer is responsible for carrying outh the inspections, and issuing the detailed inspection report. The inspection report should include a summary of remedial action to be taken and should be circulated with atleast the following distribution:

Project manager

Construction manager

Project engineer

JGCS representative

8.4 INTERNAL TRAYS AND PACKING PREPARATION

8.4.1 Dress up to be completed as much as possible in horizontal position, dress up for platforms and ladders for all elevations from top to bottom.

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8.4.2 Before installation, all location, elevation and orientation of the trays and packings and support structures shall be checked and verified in accordance with installation drawing.

8.4.3 All documents related to the trays and packings should be at job site with the concerned crew following erection.

8.4.4 Dress up items, which cannot be erected in horizontal position will be erected in vertical position after make alignment and vertically.

9. INSTALLATION

9.1 Internal manways are left open and column manholes are closed with four bolts. Only temporary gaskets should be used until final closure.

9.2 When the trays have no internal manways, pre-commissioning engineer and the Client will check the trays during site installation.

9.3 Internal manways and column manholes to be closed as soon as a closing certificate is signed by all parties, (see attachment 3).

9.4 Trays, if any to be installed during pre-commissioning. In certain instances, these will be installed after pickling, degreasing or flushing activities.

9.5 All packing to be installed during pre-commissioning.

Safety: Before entering any vessel, column, tank or confined space, ensure such entry is safe. When required, obtain an entry permit.

Inform the Site Safety Manager, or his delegate, about your entry. See also JGCS confined space work procedures. Enclosed Space Entry Permit.

The following minimum requirements will be observed prior to entry:

Oxygen level measurement.

Position a person outside the column during the internal check.

Wear protective clothing and gloves.

10. TRAY INSPECTION CRITERIA

Distillation and other tray type mass transfer devices suffer from deteriorating performance as the result of different liquid depth on the active sections.

Devices such as bubble cap trays will be less upset than vacuum tower sieve trays as the result of this effect due to greater liquid depth, but in both cases, exceeding the tolerances generally recognized as

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applicable to towers of various diameters, will provoke poor performance and jeopardize the company's guarantee position.

10.1 TRAY INSPECTION ADDRESSES TWO ELEMENTS:

10.1.1 Mechanical integrity and robustness of tray installation. Check that bolting and sealing is tight and that the superficial condition of tray components is in good condition.

10.1.2 A measurement verification exercise to establish the degree of conformity of the installation.

10.1.3 The various contributors to tray installation faults are as follows:

Tray verticality, affecting;

Tray support ring levelness.

Downcomer weir levelness as well as fabrication errors for these items, plus

Buckling and out-of-flatness of the tray panel.

10.1.4 The tolerances in the table below are very similar to those used by tray fabricators so that disputes over measurements will be minimized.

10.1.5 Maximum out-of-flatness or out-of-levelness:

Towers upto 2000mm dia 3mm

Towers over 2000mm dia 6mm

This is an absolute levelness criterion as clarified below:

One criterion only is evaluated namely the absolute deviation of any point on a tray from a reference.

The method calls for measurement of the relative level of five points in each tray panel.

Every tray is measured using a single reference point for each pass side.

A set of calibrated measuring bottles (water level) with a suitably indented base connected by a flexible hose with a length not less than two thirds of the tower diameter is used to take readings which are subsequently analyzed in the inspection report.

The tray installation is classed as satisfactory if not more than 5% of all maximum deviation measurements for a single tower exceed the levelness tolerance by not more than 1 mm.

11. PREPARATION

In order to assist the process or pre-commissioning engineer in inspecting the trays, the checklist

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indicated in 11.1 will be used.

Beside the items mentioned on this list, the following specific checks will have to be carried out:

A leak test shall be performed on all total draw-off trays. With all drain holes plugged, the drop in level shall not exceed 5 cm in 30 mins. unless otherwise specified.

A spray pattern test shall be performed on high vacuum towers. This is to make sure that no spray nozzle is blocked and that the spray pattern is such that it covers the total diameter of the column.

Leak test procedure for draw-off trays

Block drain holes with putty.

Fill with water (check water quality - maximum chlorides).

Mark level and leave for 30 minutes; level shall not drop by more than 50 mm, unless otherwise specified.

Allow water to drain and check flow (slope of gutters/trough).

Remove all putty from drain holes.

Check cleanliness and arrange acceptance.

Spray pattern test procedure

A spray pattern test must be well coordinated. To perform this test the tower must be trayed, tray and column manways opened and the following made available:

1. A circulation pump, preferably one of the process pumps. 2. A copious water supply. 3. Sufficient instrumentation to monitor the pump's performance, level and flow measurements:

A positive head must be established and the pump suction and discharge must be filled and vented.

If necessary, a pressurized hose should be connected to the suction to ensure a continuous supply of water.

A secure place above the distributor must be found to stand on and check that the spray covers the total surface.

The sequence of steps for spray testing are:

Remove all spray nozzles.

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Provide all pump strainers and filters with start-up mesh (fine mesh) to ensure that no debris enters the system.

Flush the spray distribution and associated piping system with water.

Check the filters and re-install all spray nozzles.

Pump water through the spray nozzles at flow rates ranging between 50% and 150% of the design rate (unless otherwise specified).

Record the pressure at the inlet of the spray manifold for each flow rate.

Stop water flow. The observers enter the column and position themselves above the spray manifold.

The water flow is re-started to verify the performance of the spray nozzles.

Safety:

Obtain an entry permit and results of the oxygen test.

Check for ventilation (water, mist and breathing).

Secure yourself with a safety belt.

Position a person outside the column (for radio contact).

Wear rain gear.

Carry a tool to give signals against wall.

Start pump and stop as soon as result is noted. JGCS representative should be present in the column to confirm findings.

12. PROCESS CHECK LIST FOR COLUMN/ VESSELS

The checks marked with (*) must be carried out at the manufacturers shop, if the tower is to be trayed prior to shipment. This does not preclude the necessity for site checks.

1. Check requisition/Vendor Drawings

Check for discrepancies on critical dimensions.

2. Check at Liquid Flow Path

Is liquid always present behind an inlet weir?

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Are liquid cut outs positioned correctly?

Does liquid fall into correct tray position?

3. Check Liquid Feed Inlets Are number and size of holes correct?

Is liquid distributed evenly over the tray?

Will there be any mal-distribution?

Check orientation of sparger and holes.

Check provisions for expansion differences.

4. Check Liquid Outlets

Check if vortex breakers are installed and do not obstruct flow.

5. Check Reboiler Returns

Does liquid enter correct compartments?

Does vapor distribute uniformly?

Does vapor pass through a curtain of liquid?

6. Check Thermocouple Positions

Are they located in 'dead' zones?

Do they obstruct liquid flow paths?

Check length of thermo couples.

7. Check Pressure Gauge Positions

Does liquid hit branch take off (particularly in vapor/liquid zones). If so it may need shielding.

8. Mechanical

Prior to start installation, a dimensional check shall be performed on all supports and tray rings. (*)

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- Random checks for any malfunction of valves.

Random checks for any loose bolts, (check if tack welds are required). (*)

Check if gasket material is installed. (*)

Check number of trays/valves. (*)

Check drain holes in seal pans. (*)

Check position and dimensions of slotted holes. (*)

Check DC clearances per vendor drawings (should be same over the total length). (*)

Check weir heights per vendor drawing (should be same over the total length). (*)

Check provisions for expansion (beams, valve type inlet devices, spargers, distribution etc.). (*)

Check for levelness (important on vacuum towers with minimum tray liquid depth). (*)

The out of flatness and out of levelness of trays after installation should be within following tolerances: (*)

Be less than 3 mm for trays of up to 2000 mm wide and less than 6 mm for trays over 2000 mm wide, expressed as the difference between highest and lowest points on the tray.

Note: For partial draw-off trays with a small liquid transfer to the lower trays, also a leak test may be considered.

9. Attachments

All internal attachments, e.g. bolts, nuts, clamps, blanking strips, support brackets, etc., should be securely fastened. (*)

All internal nozzles should be tightly flanged, if applicable. (Note weep and vent holes if any. On shutdown all liquid should be able to drain freely).(*)

10. Stiffness

Check the stiffness of weirs, down-comers and other unsupported attachments to ensure deflection/vibration will not occur. (*)

11. Free Movement

Where adjustable weirs have been specified check that such weirs are secured at the correct height and that future adjustment is possible. (*)

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12. Materials

Check that all materials are in accordance with specification. It is often useful to carry a magnet during inspection to check for rogue carbon steel bolts, clamps, brackets etc., in stainless steel (austenitic) service. (*)

13. Leakage

Particular attention should be paid to sealed areas for possible leakage:

All weirs should have a good all-round seal.

The tray itself should be checked for a good seal between the different sections and a proper gasket between the tray and the support ring.

Seal pans should be inspected for a good seal.

13.MISCELLANEOUS INTERNALS

Special internal items should be identified and checked out, e.g. Vortex breakers, anti-swirl baffles, demister pads, etc. (*)

Where sieve trays have punched holes, check if the direction of punching is in accordance with specification, (usually down). (*)

Where holes have been burned into a tray, for example with valve or bubble cap trays, all burrs and slag should have been completely removed. (*)

Check that the support ring, or other internals, do not blank sieve holes, valves etc. (*)

Check that the trays are clean. No bolts, nuts or debris should be left on trays.

14. PACKED COLUMNS

The packing should be checked prior to loading to ensure the correct type of packing has been received. Check:

Type (Pall, Intalox, etc.). Size. Material.

Try to assess damage, if any, (e.g. ceramic packing).

It is useful to keep a sample of packing for future reference.

In case of structured packing, check if sealing against wall, gap between packing elements, wall scrapers, number of layers, type etc., is as per specification

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Check net free area of packing supports and hold-down grids. (*)

Check if the ancillary internals (support tray, distributors, re-distributors, etc.) have been correctly installed. (*)

Ensure that correct method of loading is used - wet, stacked, random etc.

Check correct height of packing and where specified the hold down grids.

15. DISTRIBUTORS

Distributors should be thoroughly checked for levelness with a graduated water level in a similar manner to the tray level check. (*)

Check distributor piping for weep and vent holes where applicable. (*)

16. GENERAL APPEARANCE

The general appearance and cleanliness should be checked and reported. Note that all debris and as much loose rust, slag, etc. as possible should be removed prior to start-up to avert possible problems.

17. REPORT

The JGCS representative should make sure that all details of such tower inspections are fully reported since this inspection is usually the last opportunity to collect this data in a complete manner. In case of performance problems in a tower reference will be made to this original pre-startup inspection report. details should therefore be as complete as possible.

18. PUNCH LIST When discrepancies are discovered, they will be recorded on a punch list. This punch list will be cleared by the WEC erection crew.

19. CATALYST LOADING PRECAUTIONS:-

The loading operation should be conducted with reasonable speed; to ensure the catalysts does not pick-up and undue of moisture from the air.

The vessel must be loaded carefully to minimize physical damage to the pellets during loading and to prevent catalysts alteration in normal operation. Careful loading will avoid serious operation problem caused by poor packing of the bed.

The free fall of catalyst should not exceed 500mm to prevent breakage.

The bottom and top screens must be checked.

Larger hopper should be used to move the catalyst from the ground to the filling manhole. of 26




The hopper should be equipped with loading chute of correct diameter and sufficient length.

Personnel handling the catalysts during the loading must wear dust masks.

20. CATALYST LOADING:-

The catalyst is loaded after blowing, cleaning and drying of upstream and downstream piping.Before loading of catalyst man hole should be opened first..Inspect the interior of each reactor, to ensure that the vessel is clean, dry and free from loose scale and debris.

It is essential that the charging level is clearly defines, so as to avoid under-or overfilling.

It should be checked that the thermo wells are installed as specified (including gaskets) and that the catalyst retaining plate and the blind flange on the unloading handhold are installed.

All measurements should be made from a fixed reference point at the top of the vessel although guidance marks may be made on the vessel internal by means of blackboard chalk.

For charging heights and weights see the corresponding catalyst data sheets Weight of catalyst, vendor batch number and any other relevant catalyst data should be recorded. Make sure that the required amount of catalyst and support is loaded

Install a large funnel 18 to 24 inches in diameter at the top, tapering down to four to six inches at the bottom, in the manhole above the bed. To the bottom of the funnel, attach a canvas sock or hose arrangement of sufficient length to reach the bottom of the reactor.

Hoist catalyst or support balls up in buckets and pour into the funnel. As the level builds up in the vessel, raise the funnel and withdraw the chute so that the catalyst/support will flow out.

Keep the chute full all times so catalyst does not drop more than about 12 inches.

Level the catalyst or catalyst support bed every 3 feet of height increase. If it is necessary for a man to enter the vessel during loading, precautions must be taken so that he does not stand directly on the catalyst.

A board must be placed over part of the bed to distribute his weight. After all of the catalyst and catalyst Support balls have been loaded, disconnect the air hose, Close the bottom drain and secure manholes.

Refer to operating and instruction manual supplied by catalyst vendor for detailed procedures.

21. FINAL LEAK TEST:-

After the catalyst loading is completed, the tightness of the reactor has to be ascertained.The reactor is isolated and pressurized with air to the maximum pressure available or compatible with the equipment.

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The tightness is considered satisfactory when the pressure loss is less than 0.05165kg/cm2/hour, over four consecutive hours.

After the leak test the reactor is purged with nitrogen until the oxygen content is 0.2% volumemaximum.

If for any reason the leak test of the unit as described earlier has not been performed yet, proceed to an overall leak test of the unit, reactor included.

After the leak test the reactor is isolated by blinds if start-up is not going to take place immediately and kept under a nitrogen atmosphere.

22. ATTACHMENTS

1. Process check inspection sheet2. Process inspection certificate3. Closing certificate.

1. PROCESS CHECK INSPECTION SHEET

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Tower No. Name :No. of Trays : Type :1.0 Tray No. Type :2.0 Number of Holes, Valves, Bubble Caps, Chimneys :2.1 For Sieve Trays :

Diameter of Chimney in mm :Hole pitch in mm : Distance Chimney Top - Cap in mm :

3.0

3.1 3.2

Calming Zones :

At inlet weir : Length of calming zone in mm :At outlet weir: Length of calming zone in mm :

4.0 Inlet Weir :

Length in mm : Level Deviation in mm : Height of inlet weir in mm :

5.0 Outlet Weir :

Length in mm : Level Deviation in mm : Height of outlet weir in mm :

6.0 Downcomer Clearance in mm :7.0 Levelness/Flatness of Tray :

(Deviation of level in mm) : Along Flow Path : Perpendicular to Flow Path :

8.0

8.1

8.2

Nozzles :

Inlet Nozzle :Height of bottom of nozzle above tray in mm:For Sparger : Diameter of Hole in mm :Number of Holes : Pitch in mm :

Outlet Nozzle : Height of bottom of nozzle above tray or gutter, etc. in mm :

9.0 Seal Pan : Weir height in mm : Downcomer clearance in mm :

10.0 Remarks: e.g.Have drain holes been provided in seal pans?

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Have vent holes been provided in spargers? Do trays require cleaning?

Inspection Carried Out by: Sign:

2. PROCESS INSPECTION CERTIFICATE

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3. Closing Certificate

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method statement of internal trays, packing & catalyst loading

Documents

construction s

inspection plan s

painting s

heights s

scaffolding procedure

radiography procedure

program procedure s

excavation procedure