Construction Method by Jack Up [PDF]

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CONSTRUCTION METHOD Document No.



CLIENT



:



CONTRACTOR



:



PROJECT NAME



:



LOCATION



:



CONTRACTUAL NO.



0 REV.



DATE



Rev. : 0 Sheet No. 1 of 23



Jack Up Method on Storage Tanks Erection



6



Rev.



SHT



REMAR K



:



PREPARE BY



CHECKED BY



APPROVE D BY



PT WIJAYA KARYA



CHECKED BY



APPROVED CLIENT



CONSTRUCTION METHOD Document No.



Rev. : 0 Sheet No. 2 of 23



Jack Up Method on Storage Tanks Erection



REVISION SHEET No



Revision



Date



Remark



CONSTRUCTION METHOD Document No.



Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 3 of 23



TABLE OF CONTENT



1.



GENERAL...................................................................................................................



4 2.



REFERENCES............................................................................................................



4 3.



PREPARATION..........................................................................................................



4 4. 4



ERECTION STEPS....................................................................................................



CONSTRUCTION METHOD Document No.



Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 4 of 23



1. Purpose. Construction method is a written document demonstrates the manufacture process in fabrication and erection for Suban Condensate Storage Tank. 2. Scope. Construction Method for Suban Condensate Storage Tank consists of:  Receiving Material  Fabrication  Material handling  Erection with Jack Up Method  Inspection or NDT (Non Destructive Test)  Pre-Commissioning 3. Receiving Material. All material will be received at Jakarta Workshop for Suban Condensate Storage Tank Project. Every material received shall be inspected as follow:  Check the material status and quantities according to the description on 



the delivery document. Check the materials dimension and thickness shall be accordance to the







approved drawing. Request for inspection to third party (if required) or client to witness







and approved the material before start the fabrication. All the material shall accordance to material mill certificate and recorded by Quality Control



4. Fabrication.



CONSTRUCTION METHOD Document No.



Rev. : 0 Sheet No. 5 of 23



Jack Up Method on Storage Tanks Erection



All material which is required for fabrication will be fabricated at the Jakarta Workshop and will be transported to Suban Conocophilips after fabrication completion. Fabrication of the tank consists of: 4.1. Fabrication of annular plate 4.2. Fabrication of bottom plate 4.3. Fabrication of shell plate 4.4. Fabrication of top angle 4.5. Fabrication of roof structure 4.6. Fabrication of roof plate 4.7. Fabrication of accessories 4.1. Fabrication of annular plate. 4.1.1. Preparation is carried out to prepare two pieces of plate are places on the flat area and do the measurement of dimension, as well marking to set the dimension accordance to approved drawing. 4.1.2. Make a mold that made from wooden board, where the wooden board shall be made to the nominal outer radius of annular plate, mark the plate with marker or used a stamp for cutting guideline. Description Condensate Tank Fire Water Tank



Outer Radius (mm) 18,541 6,942



4.1.3. Carried out using the cutting machine, following the marking line that has been set. 4.1.4. The edge joint between two annular plates shall be beveled; the angle of bevel shall accordance to the approved drawing. 4.1.5. Annular that has completed must be marked with item number and tank number, for easy identifying and transfer the heat number of materials 4.1.6. All the fabrication process for annular plate must recorded and control by Quality Control. 4.2. Fabrication Bottom Plate.



CONSTRUCTION METHOD Document No.



Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 6 of 23



4.2.1. Mark and cut the bottom plate to dimension that are according to the approved drawing. 4.2.2. The length of lap joint or single welded lap joint between bottom plates with minimum 30 mm. 4.2.3. The distance between shell plate and annular plate weld to the single lap joint of annular plate and bottom plate shall be minimum 600 mm. 4.2.4. Every material of bottom plate shall be marked with the item number and tank number, for easy identifying. And the heat number shall be transferred and recorded by Quality Control. 4.3. Fabrication Shell Plate. 4.3.1. Prepared the shell plate on the flat surface, and do the marking according to the dimension in the approved drawing. 4.3.2. Marking on the shell plate the width and length dimension shall be perpendicular. 4.3.3. Recheck the dimension after cutting, also clean or grind the sharps edges and the surface of the beveled. 4.3.4. A mold shall be made accordance to the inner radius of shall plate. The mold is a guide for implementation of rolling. Description Condensate Tank Fire Water Tank



Inner Radius (mm) 18,441 6,858



4.3.5. Roll the entire shell plate and examine by using the mold. 4.3.6. Every material of shell plate shall be marked with item number and tank number, for easy identifying. And heat number shall be transferred and recorded by Quality Control. 4.4. Fabrication Top Angle. 4.4.1. Checked dimension of top angle to ensure that the material was in accordance with approved drawing. 4.4.2. Tack weld together two top angle surface to surface adjacently, afterward that angle that has been joined may proceed to roll.



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Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 7 of 23



4.4.3. During the rolling process, the radius of angle shall be checked with the same mold that is used for the shell plate. 4.4.4. After rolling was done, remove the tack weld and grind the tack residue. Recheck again the radius to make sure its still meet the radius according to the approved drawing. 4.4.5. Every material of top angle shall be marked with item number and tank number, for easy identifying. And heat number shall be transferred and recorded by Quality Control. 4.5. Fabrication Roof Structure. 4.5.1. Roof structure consists of center drum, roof rafter, gusset plate, and roof girder. 4.5.2. Check the material dimension, further more can be marked and fabricated to appropriate dimensions accordance to approved drawing. 4.5.3. The main concern is also the type and form of roof structure, for the Suban Condensate Storage tank Project is using the cone roof type. 4.5.4. Every material of Roof structure shall be marked with item number and tank number for easy identifying. And heat number shall be transferred and recorded by Quality Control. 4.6. Fabrication Accessories. 4.6.1. The accessories on the tank is generally consist of manhole, nozzle, stairway, hand railing, post hand railing, name plate, pipe support and etc. 4.6.2. Before precede to the fabrication, first is checking the material dimension, furthermore can be marked and fabricated to appropriate dimension accordance to approved drawing. 4.6.3. For the possibility of connection must be adjusted to actual condition, and can be carried out at the time of erection. At the time of fabrication is given more dimension tolerance.



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Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 8 of 23



4.6.4. Every item of accessories shall be marked with item number and tank number for easy identifying. And the heat number shall be transferred and recorded by Quality Control. 5. Material Handling. 5.1.



Before all the materials will be transported to the site, all the material will be sand blasted and painted with the primer paint, to protect the materials from the corrosions during delivery and standby at the lay



5.2.



down area. All the material will be packed and tied with the metal straps, but the weight for each pack will calculated to the capable capacity of the



5.3.



crane at site For materials such as bottom plate, annular plate, shell plate, roof plate shall be packed and strap accordance to the tank number for easy



5.4.



identifying. For all material such as bottom plate, annular plate, shell plate and roof plate will be stacked and between each plate shall be placed a thin



5.5.



wood to protect the surface of material contact each other. Shell plate materials shall be seated on the skid, to protect radius of



5.6.



shell plate from deformation. Nozzle material shall be transported inside the wooden box, and the surface of the flange shall be covered with wooden board, to protect



5.7.



surface of flange from any damage. At the lay down area, the materials shall be placed accordingly with the



5.8.



priorities. The material will be transported with the trailer trucks, the weight of load shall be not exceeded the capacity of the trailer truck.



6. Erection with Jack Up method 6.1.



Checking the foundation. 6.1.1.



Before annular and bottom plate being erected the orientation and the level on the foundation shall be checked, which the data



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Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 9 of 23



on the orientation and level of the foundation shall provided by 6.1.2.



the civil contractor. After orientation of the foundation is found follow the approved for construction drawing, than pull a wire on the position 0º to 180º and on the position 90º to 270º to get a center point of the foundation.



6.2.



Erecting annular plate 6.2.1.



Measuring from the center of the foundation to the outside



radius of the annular. 6.2.2. Annular plate shall be erected one by one until all annular plate 6.2.3.



linked. Fit up and tack weld on the joint of annular plate before welding to the joint. Check the outer radius to be sure if the



6.2.4.



radius according to approved drawing. During the fit up, on the annular surface shall be placed a jig to



hold on during the welding, to prevent plate from deformation. 6.2.5. Next step is welding on the annular plate joint, which can be started before bottom plate is finish being fit up. 6.3.



Erecting bottom plate 6.3.1.



Erection bottom plate shall be started from the center of bottom plate, which follows the center point of the foundation that has



6.3.2.



been marked. The orientation of bottom plate shall be accordance to the



6.3.3.



approved drawing. The other bottom plate shall be arranged from the center to



annular plate, distribute all the bottom plate to its position. 6.3.4. During the fit up on the bottom plate the overlap between bottom and bottom to annular shall be measured. The overlap need not exceed 25 mm.



CONSTRUCTION METHOD Document No.



6.3.5.



Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 10 of 23



Once the fit up on the bottom plate were done, the welding on the joint shall be carried on by following the bottom plate welding sequence.



6.4.



Erecting shell plate. 6.4.1.



For the Suban condensate storage tank project, the method of



erecting shell plate by jacking up method. 6.4.2. Jack up method is erecting the shell plate from top to bottom. 6.4.3. At Suban condensate storage tank project the specification as: Condensate tank Shell 1 Shell 2 Shell 3 Shell 4 Shell 5 Shell 6 Shell 7 Shell 8 Fire water tank Shell 1 Shell 2 Shell 3 Shell 4 Shell 5 Shell 6 Shell 7 6.4.4.



Thickness (mm) 14 12 9 8 8 8 8 8 Thickness (mm) 9 8 6 6 6 6 6



Erecting shell plate for condensate tank shall be started from shell 7 and shell 8, and for fire water tank shall be started from



6.4.5.



shell 6 and shell 7. Make a shell inside diameter line and checking line on the annular plate, which the checking line shall be 100 mm from



6.4.6.



the shell inside diameter line. The support beam shall be placed on the annular plate before erecting the shell plate.



CONSTRUCTION METHOD Document No.



6.4.7.



Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 11 of 23



The number of support beam needed for each condensate tank is 38 nos. and for fire water tank is 14 nos.(Figure1)



(Figure 1) 6.4.8.



Erect the shell plate one by one until its complete ring, by



6.4.9.



following shell inside diameter marked on the annular plate. Place a support on the inside of the shell plate to make sure the plate is standing straight. (Figure 2)



6.4.10. After all shell plate is supported, fit up on the shell plate before



any welding to the joint. 6.4.11. Inspection on the shell shall be carried out such as plumbness and roundness, to make sure the shell plate in the right position before continuing to next shell.



(Figure 2) 6.5.



Erecting top angle and roof structure and roof plate. 6.5.1.



After all two shell plate have been erected and welded, the next process is erecting the top angle. (Condensate tank shell 7 and



6.5.2. 6.5.3.



shell 8, and for Fire water tank shell 6 and shell 7) Check the roundness of the top angle before start the welding. During the welding process on the top angle, the temporary column for support the center drum shall be installed; the



CONSTRUCTION METHOD Document No.



Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 12 of 23



temporary column shall be tied with wired slings to prevent its 6.5.4.



falling to any direction. (Figure 3) Temporary column shall not be removed until entire roof rafter



is connected. 6.5.5. The gusset plate shall be installed to the shell plate by 6.5.6.



following the orientation on the approved drawing. Erect the roof structure such as roof rafter and roof girder, and



6.5.7.



shall be bolted to the gusset plate and center drum. All bolted rafter and girder shall be check the bolt tension with



the moment key tool, to prevent if there are any loose bolt. 6.5.8. Once the roof structure is completed and checked, continue 6.5.9.



erecting the roof plate. The orientation of the roof plate shall accordance to the



approved drawing. 6.5.10. Fit up the roof plate with a temporary jig, the function of the temporary jig is used to prevent the roof plate from deformation during the weld. 6.5.11. After the roof plate done fitted and welded, the temporary column for center drum shall be removed before continuing erected the next shell plate.



(Figure 3) 6.6.



Erecting the next shell plate. 6.6.1.



Erecting the next shell plate shall be done by hydraulic jack.



CONSTRUCTION METHOD Document No.



Rev. : 0 Sheet No. 13 of 23



Jack Up Method on Storage Tanks Erection



The components of hydraulic jack are: Hydraulic Pump attached to the hydraulic oil tank Control valve (manifold) to synchronization output to each hydraulic jack. Rubber hoses Hydraulic jack Cap. 30 Ton/unit Jack up column Support bracket Mild steel profile (H beam 150 x 150 and H beam 100 x 100) 6.6.3. The number of hydraulic jack needed for the Suban condensate 6.6.2.



      



storage tank project is: Description Condensate Tank 1 Condensate Tank 2 Fire Water Tank 6.6.4.



No. of Hydraulic Jack 28 28 10



Set the jack up column, support bracket, control valve and



hydraulic jack on the inside of tank. 6.6.5. The support bracket shall be welded to the shell plate. Support 6.6.6. 6.6.7.



bracket welded in between two jack up column. Put the hydraulic jack under the support bracket. Connected the entire hydraulic jack with the rubber hose to



6.6.8. 6.6.9.



control valve. The hydraulic jack shall be seated on the Mild steel profile. The inside shell plate that will be welded with support bracket, on the outside of the shell plate shall be installed a stiffener using CNP 150 x 50 x 100, this stiffener only installed on the



shell plate thickness less than 10 mm. 6.6.10. Checked every connection of hydraulic jack before start to jacking up. 6.6.11. Only operator of jack is allowed to control the control valve. 6.6.12. Each hydraulic jack will be lifted until 40 cm on the single



move and it will moved synchronized 6.6.13. Every single hydraulic jack shall be monitored by one person;



this person will place the mild steel profile when the hydraulic jacks reach the maximum height.



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Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 14 of 23



6.6.14. Jacking the tank to the height 2,000 mm, then starts erect the



next shell plates.(Figure 4)



(Figure 4) 6.6.15. When all shell plates are finished than start the process of fit up and welding until finish. 6.6.16. Before jacking up the next shell again, the inspection shall be



carried out, such as peaking, banding, plumbness, roundness and radiography 6.6.17. Support bracket shall be removed from the previous shell plate



and installed again on the new shell plates for continuing erection the next shell plate.(Figure 5 and Figure 6)



(Figure 5)



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Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 15 of 23



(Figure 6) 6.6.18. Continue the process similarly, until the last shell plate erected



(shell 1) 6.6.19. After all last shell plates (Shell 1) were welded and inspected, than the support beam on the annular plate shall be removed. 6.6.20. With the hydraulic jack put the last shell plate (shell 1) seated



on the annular plate. 6.6.21. Fit up the corner joint of shell plate and annular plate. 6.6.22. Before start welding on the corner joint, check the plumbness and roundness of the tank. 6.6.23. Welding the corner joint from the inside of joint. Used the right



angle vacuum box to inspect welding, check if there any leak on the welding. 6.6.24. All the temporary support, jack equipments, jigs and tools shall



be removed. 6.6.25. When inside of the tank is cleaned, the process of vacuum on the bottom plate shall be proceed. 6.6.26. All the tank accessories and nozzle shall be installed once the



welding on the corner joint completed.



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Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 16 of 23



6.6.27. Installation of tank accessories and nozzle shall be accordance



to approved drawing. 6.6.28. All the reinforcement plate for nozzle shall be inspected by



pneumatic through the tell tale hole. 6.6.29. All the inspection for the tank such as visual, plumbness, roundness, peaking, banding, pneumatic and radiography shall be done before staring for water filling or hydrostatic test. 6.6.30. Check all nozzles and manholes are bolted tightly than the water can be pump into the tank. 7. Inspection. 7.1. 7.2.



7.3.



The process of inspection shall be accordance to approved ITP (Inspection Test Plan). The inspection consists of:  Peaking  Banding  Plumbness  Roundness  Vacuum  Pneumatic  Radiography  Hydrostatic Peaking 7.3.1.



Peaking inspection is measuring the joint on the shell plate,



7.3.2.



especially on the vertical joint of the shell plate. The tool for peaking inspection is wooden board, where on side of the board have a curve that follow the radius of the tank that



shall be inspected. 7.3.3. The minimum board for peaking inspection is 900 mm. 7.3.4. Placed the wooden board on the shell surface with horizontal 7.3.5.



position. Visually seeing the gap between the wooden board and the



vertical joint shell plate. 7.3.6. Measured the gap with small iron ruler.



CONSTRUCTION METHOD Document No.



7.3.7. 7.3.8.



Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 17 of 23



The maximum tolerance gap for peaking inspection is 13 mm. If the gap exceeds 13 mm, than the vertical joint shall be



repaired. 7.3.9. After the repaired, the gap shall be measured again until the gap not exceeds 13 mm. 7.3.10. Applied this peaking inspection to all shell plate vertical joint. 7.3.11. Quality Control shall be recorded the result into Peaking



Inspection report. 7.4.



Banding 7.4.1.



Banding inspection is measuring the joint on the shell plate,



especially on the horizontal joint of the shell plate. 7.4.2. The tool for peaking inspection is wooden board, where both 7.4.3. 7.4.4.



side of the board have to be straight. The minimum board for peaking inspection is 900 mm. Placed the wooden board on the shell surface with vertical



7.4.5.



position. Visually seeing the gap between the wooden board and the



7.4.6. 7.4.7. 7.4.8.



horizontal joint shell plate. Measured the gap with small iron ruler. The maximum tolerance gap for peaking inspection is 13 mm. If the gap exceeds 13 mm, than the horizontal joint shall be



repaired. 7.4.9. After the repaired, the gap shall be measured again until the gap not exceeds 13 mm. 7.4.10. Applied this banding inspection to all shell plate horizontal



joint. 7.4.11. Quality Control shall be recorded the result into Banding Inspection report. 7.5.



Plumbness 7.5.1. 7.5.2.



Plumbness inspection is to measure the slope of the tank. Plumbness inspection shall be conducted on the first erected shell plate.



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Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 18 of 23



7.5.3.



The first shell plate shall be checked the plumbness because it



7.5.4.



will determine the slope of the nest shell plate. Plumbness inspection shall be conducted on several point of



degree such as 0º, 45º, 90º, 135º, 180º, 225º, 270º and 315º. 7.5.5. The equipment for plumbness is the elbow ruler or perpendicular ruler, which the other end of ruler will tied with the string. And at the other end of string tied to the weight. 7.5.6. Placed the elbow ruler tied with the string on the top of the 7.5.7.



shell plate with a distance 100 mm from the surface. Measured the length relatively at the bottom of the shell shall not exceed 1/200 of the total tank height. Description Condensate Tank Fire Water Tank



7.5.8.



1/200 x total tank height (mm) 50 55



Plumbness inspection shall be conducted on every shell plate



erected. 7.5.9. Quality Control shall be recorded the result into Plumbness inspection report. 7.6.



Roundness. 7.6.1. 7.6.2.



Roundness inspection is to measure the roundness of the tank. Roundness inspection shall be conducted on the first erected



7.6.3.



shell plate. The first shell plate shall be checked the roundness because it



will determine the roundness of the nest shell plate. 7.6.4. Roundness inspection shall be conducted on several point of 7.6.5. 7.6.6.



degree such as 0º, 45º, 90º, 135º, 180º, 225º, 270º and 315º. The equipment for roundness inspection is measuring tape. Pull the measuring tape from the center of the tank to shell



7.6.7.



plate surface with the height 300 mm from the bottom plate. Measured the tank radius and continue the process at other



degree. 7.6.8. The tolerance radius of roundness as follow:



CONSTRUCTION METHOD Document No.



Jack Up Method on Storage Tanks Erection



Tank Diameter (m) < 12 From 12 to < 45 From 45 to < 75 ≥ 75 7.6.9.



Rev. : 0 Sheet No. 19 of 23



Radius Tolerance (mm) ± 13 ± 19 ± 25 ± 32



The tank diameter for Condensate tank is 36.88 m and fire



water tank is 13.71 m 7.6.10. The tolerance for both condensate and fire water tank is 19 mm. 7.6.11. Quality Control shall be recorded the result into Roundness Inspection report. 7.7.



Vacuum. 7.7.1.



Vacuum inspection is checking a leak on the lap welding joint



7.7.2.



on the bottom plate With the right angle corner vacuum box, can be conducted the inspection for corner joint of shell plate and annular plate.



7.7.3.



Before the lap welding joint being vacuum box test the welding area have to be visually check and have to be clean from mud, soil, dust and other thing that not expected.



7.7.4.



Vacuum box is complete with valve and vacuum gauge that have been calibrated, compressor, and rubber hose, clam, and gasket seals.



7.7.5.



Bottom welding have to be test using vacuum with pressure 20 kPa up to 35 kPa.



7.7.6.



Approximately 750 mm of welding that will be test shall be applied the soap solution.



7.7.7.



Vacuum box test shall have at least 50 mm overlap of previously viewed surface on each application.



7.7.8.



The bottom plate surface temperature limits shall be between 4ºC and 52ºC.



CONSTRUCTION METHOD Document No.



7.7.9.



Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 20 of 23



Minimum light intensity of 1000 lux at the point of examination is required during the application of the examination and evaluation for leaks.



7.7.10. The vacuum shall be maintained for greater or at least 10



seconds time required viewing the area under test for leaks. 7.7.11. The presence of leaks indicated by continuous formation or



growth of bubble or foam, produced by air passing through is unacceptable. 7.7.12. The leaks shall be repaired and retested. 7.7.13. Quality Control shall be recorded the results into vacuum



inspection report. 7.8.



Pneumatic. 7.8.1.



Pneumatic test is a process by applying air pressure into reinforcing plate to check if there are any leaks on the reinforcing weld.



7.8.2.



After all reinforcing plate for nozzles installed but before the tank is filled with water; the reinforcing plate shall be tested by applying air pressure up to 100 kPa.



7.8.3.



Applied the welding on reinforcing plate with soup solution, than applied the air pressure through telltale hole



7.8.4.



Both inside and outside of reinforcing plate shall be tested.



7.8.5.



If there are leaks found, than the welding on the reinforcing plate shall be repaired and retested.



7.8.6.



Quality Control shall be recorded the results into Pneumatic test report.



7.9.



Radiography.



CONSTRUCTION METHOD Document No.



7.9.1.



Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 21 of 23



Radiography inspection is required for shell butt welds and annular plate butt welds.



7.9.2.



Radiography inspection is not required for roof plate welds, bottom plate welds, welds joining the top angle to either the roof or shell, welds joining the shell to the annular plate and welds in nozzle and manhole.



7.9.3.



Quality Control shall provide the Radiography map for approval.



7.9.4.



The quantities of film and spots of radiography shall be applied in accordance to the approved radiography map.



7.9.5.



Each radiography shall clearly show a minimum of 150 mm of weld length.



7.9.6.



The process of radiography shall be conducted by qualified NDT Company.



7.9.7.



To interpret the result of radiography shall be conducted by inspector level 2 of the NDT Company.



7.9.8.



All the results of radiography inspection shall be collected by Quality Control and compiled into Manufacture Data Report.



7.10.



Hydrostatic. 7.10.1. Hydrostatic test conducted for leaks, slope and to determine if



construction can withstand tank load weight during operation without failure. 7.10.2. Hydrostatics test also to check the strength of the tank



foundation to decrease of the tank foundation elevation. 7.10.3. Equipments for hydrostatic test:







Distribution water pump







Pipe or hose







Temporary gasket for manhole and nozzles.



CONSTRUCTION METHOD Document No.



Jack Up Method on Storage Tanks Erection







Blind flange







Valve







Transparent hose







Survey equipment like theodolite.



Rev. : 0 Sheet No. 22 of 23



7.10.4. Before filling the water, the following shall be checked:



7.10.4.1.



All welding and all other inspection shall be finished.



7.10.4.2.



The level on the tank shall be recorded by measured the surrounding elevation of tank diameter.



7.10.4.3.



All the temporary tools or jigs shall be removed and cleaned



7.10.4.4.



All nozzles shall bolt tightly with the blind flange.



7.10.4.5.



Installed pipe or hose to the tank and connected to the distribution water pump.



7.10.4.6.



Installed the transparent hose along the stairway for easy identifying the level of water been reach.



7.10.5. The water shall be filled into certain level and shall stop before



continue to the next level. 7.10.6. The level of water filling is 25%, 50%, 75% and 100% of the



tank height. 7.10.7. For the level of 25%, 50%, and 75% that water shall stop and



check for leaks, and hold for 12 to 24 hours. 7.10.8. After holding the water for 12 to 24 hours the level elevation of



foundation shall checked. 7.10.9. For final water filling to 100%, the water shall be hold for at



least 24 to 48 hours. 7.10.10. Quality Control shall be recorded the results into Hydrostatic



Inspection report.



CONSTRUCTION METHOD Document No.



7.11.



Jack Up Method on Storage Tanks Erection



Rev. : 0 Sheet No. 23 of 23



Pre-commissioning. 7.11.1. Pre commissioning is to check all accessories are installed to its



place and accordance to approved drawing. 7.11.2. Check every instrument and valve is connected tightly 7.11.3. Check all the surface area if there are any defect before the



commissioning.