Aker Offshore Partner

Statfjord Late Life Project STATFJORD B

CLIENT CONTRACT NO.

4600006571

REV. SUBJECT OF CHANGE AND/OR PURPOSE OF DATEORIGI-NATOR

DISC. CHECK

APPRL. DISC.

APPRL. PROJ.

APPRL. CLIENT

02.02.09 JDK LH DOCUMENT TITLE TOT. NO. OF PAGES

Pipe Support Adjustment Procedure for Flags Metering Skid During USM Maintenance.

34 +

APPENDICES FACILITY CODE AREA CODE SYSTEM CODE DOC. TYPE DOCUMENT NO. REVISION

SFB

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Table of Contents 1. INTRODUCTION ...................................................................................................................................... 3 2. OBJECTIVE.............................................................................................................................................. 3 3. REFERENCE DOCUMENTS ................................................................................................................... 3 4. GENERAL WARNINGS............................................................................................................................ 4 5. PIPE SUPPORT ADJUSTMENT PROCEDURE FOR USM REMOVAL .................................................. 5 5.1 Pipe Support Adjustments that are required before displacing the Pipe. ................................................ 6 5.2 Pipe Support Adjustments that are required for holding the pipe in the displaced position. ................. 15 5.3 Pipe Support Adjustments that are required before re-starting the Metering Stream, after USM maintenance. .............................................................................................................................................. 24 6. APPENDICES ........................................................................................................................................ 30 6.1 Pipe Stress Isometrics and Pipe Support Drawings ............................................................................. 31 6.2 Zero-Gap Mechanical Flange Spreader Instruction Manual and Data Sheet........................................ 32 6.3 Norsok Kompaktflenser Installsjonprosedyre........................................................................................ 33 6.4 Check List for USM Removal Procedure. ............................................................................................. 34

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1. INTRODUCTION The Flags Export Gas Metering Skid, MB 3303, on SFB platform consists of two identical 10" Metering streams connected to common inlet and outlet headers. Each metering stream consists of an Ultra Sonic Meter (USM) with an isolation valve on either side of the USM. There is to be an operational requirement for the Ultra Sonic Meter (USM) from any one of the metering streams to be taken out of operation from the connecting piping for maintenance and re-calibration, while the other metering stream is in operation. The modified bolted adjustable pipe support arrangement enables the removal of USM from one metering stream while the other stream is in operation. In order to take out the USM from the metering Stream, the corresponding connecting piping to the USM needs to be sprung apart along the axial direction 20mm towards North and 15mm towards South direction as explained in Section 5, Pipe Support adjustment Procedure for USM removal, of this document.

2. OBJECTIVE The objective of this document is to present a procedure that will satisfactorily allow the removal of USM from one metering stream while the other metering stream is in operation. In particular this procedure is intended to safeguard the piping system from overstressing and flange leakage, due to displacing of connected piping 20mm in the North and 15mm in the South direction respectively. 3. REFERENCE DOCUMENTS

The following documents are referenced in conjunction with this procedure. 1 Zero-Gap Mechanical Flange Spreader Instruction Manual and Data Sheet 2 Norsok Kompaktflenser Installsjonprosedyre 3 OLF Hndbok I Flensearbeid 4 Piping Stress Isometrics and Pipe Support Drawings 5 Sub-Supplier Documentation for Rosenberg, Skid, Ref.Doc No:BP-AK-EI190-YX-0049-A2, Rev.A2 6 PROCEDURE FOR USM EXCHANGE, Ref. Doc. No: BP-AK-EI190-KX-0168

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4. GENERAL WARNINGS a) It is strongly recommended that the whole procedure described in this document needs to be fully understood before starting the USM removal operation. A checklist for the USM Removal Procedure is provided in Appendix 6.4 of this document and that needs to be completed during USM removal. b) Before staring the USM removal procedure and before re-starting the Metering Stream after USM maintenance, the entire pipe supports needs to be set into the normal operating position as shown below.

Pipe Support Functions a) Rest + Hold Down + Guide + Adjustable Line Stop without any gaps in the North and South side. b) The U-Strap is in the Stand-by position.

Pipe Support Functions a) Adjustable Guide without any gap in the North and South side + Line Stop

Pipe Support Functions a) Rest + Guide

Pipe Support Functions a) Rest + Hold Down + Guide + Adjustable Limit Stop with 15mm Gap in the South side b) The U-Strap is in the Stand-by position. c) The bolted shim plate is in the Stand-by position

Pipe Support Functions a) Rest + Guide

Pipe Support Functions a) Rest + Hold Down + Guide + Adjustable Limit Stop with 15mm Gap in the South side b) The U-Strap is in the Stand-by position. c) The bolted shim plate is in the Stand-by position

Pipe Support Functions a) Rest + Guide

Pipe Support Functions a) Rest + Hold Down + Guide + Adjustable Line Stop without any gaps in the North and South side. b) The U-Strap is in the Stand-by position.

Pipe Support Functions a) Guide with 10mm Gap+ Line Stop

Figure showing the pipe support functions for the Metering Skid during the normal operating condition

USM No temporary Supports.

USM No temporary Supports.

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5. PIPE SUPPORT ADJUSTMENT PROCEDURE FOR USM REMOVAL

The pipe support arrangement for Flags Export Gas Metering Skid piping is shown on the isometric sketch below.

The inlet header is supported at data point 40 with a Line Stop and an adjustable Line Guide. Each metering stream in the North-South direction is supported by four pipe supports and they are: 1) Rest + Guide + Adjustable Line Stop at the North side on the elbow (Data point 70 and 580). 2) Rest + Guide on the North side of the USM (Data point 105 and 545). 3) Rest + Guide + Adjustable Limit Stop on the South side of the USM (Data point 155 and 495). 4) Rest + Guide on the Tee in the South side (Data point 230 and 400). The Outlet header is supported at the data point 330 with a Guide and Line Stop. The piping stress isometrics and the relevant pipe support drawings are included in Appendix 6.1 of this document.

Client : StatoilHydro Statfjord B Aker Offshore Partner Project Name: Statfjord Late Life Project Page: 6 of 34 Doc. No: Date: 25.01.2009Titel : Pipe Support Adjustment Procedure for Flags Metering Skid Rev.: 1 During USM Maintenance.

In order to take out the USM from any one of the Metering stream, the corresponding connecting piping to the USM needs to be displaced along the axial direction 20mm towards the North and 15mm towards the South direction as shown on the isometric drawing on the previous page. The pipe support adjustments that are required during the USM removal are categorically listed in the next paragraph. There are two sets of pipe support adjustments that need to be done for taking out the USM from the metering stream and another one set of adjustment before re-starting of the Metering Stream, after USM maintenance. 3.1 Pipe Support Adjustments that are required before displacing the pipe. 3.2 Pipe Support Adjustments that are required for holding the pipe in the displaced position. 3.3 Pipe Support Adjustments that are required before re-starting the Metering Stream, after USM maintenance. 5.1 Pipe Support Adjustments that are required before displacing the Pipe. Step 1. Isolation of USM by closing the block valves. Close the isolation valves on either sides of the USM. Allow sufficient time for cooling down of the metering piping between the isolation valves. Follow the procedure described in section 2 of the document titled PROCEDURE FOR USM EXCHANGE, Ref Document number BP-AK-EI190-KX-0168 for Depressurising, purging, and electrical isolation of the metering run. Step 2. Installation of a temporary support for the USM. Provide a temporary support for the USM in order to take its weight during its removal from the metering stream. This is to protect the piping from over stressing while the USM is disconnected from the metering stream at one end. Step 3. Adjusting the Guide Gap on the Inlet Header Support.

Adjustable Guide in the

North side with special slotted

holes

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Ref. Data Point : 40 Pipe Support Tag : PS-M11-1289 This Support adjustment is common for USM removal from East side and West side metering streams. The bolted Guide in the North side of the support has got special slotted holes. The Guide gap in the North side can be adjusted from 0mm to 10mm by sliding the bolted guide through the slotted holes. Do the following adjustment to this bolted guide to bring the Guide gap to 10mm. a) Loosen the three bolts that attach the Guide in the North side to the support steel. b) Slide the Guide through the slotted holes to bring the Guide gap to 10mm in the North side of the support. c) Re-tighten the three bolts to fasten the Guide in the above described position.

Gap between the Trunnion base plate and the Guide in the North side is 0mm.

Adjustable Guide slided to the West side position to bring the Guide gap to 10mm

Gap between the Trunnion base plate and the Guide in the North side is 10mm.

Pipe Support showing the position of Guide in the normal operating condition

Pipe Support showing the position of Guide during USM removal

PLAN VIEW

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Step 4. Adjustment of Line Stop Gap at the Elbow Trunnion Support in the North side of USM The Elbow Trunnion Support in the North side of USM is provided with a 20mm thick bolted Shim plate as shown on the figure below.

The Shim plate can be moved up or down through the vertical slotted hole, to adjust the Line Stop gap from 0mm to 20mm. Do the following adjustment to the support. a) Loosen the two bolts that attach the Shim Plate with the Line Stop b) Slide the Shim Plate in the Upper most position to bring the Line Stop gap to 20mm in the North side. c) Re-tighten the two bolts to fasten the Shim plate in the above described position.

20mm Thick Shim Plate with

slotted holes

Shim Plate after moving to the

UP position

20mm gap between the Trunnion base plate and the

Line Stop in the North side

Pipe Support showing the position of bolted Shim Plate during the normal operating condition

Pipe Support showing the position of bolted Shim Plate during the USM removal

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If the sliding shim plate is jammed between the Trunnion base plate and the Line Stop at the North side, it maybe difficult to move it to its Up position. The Support steel is provided with two 14mm diameter holes. It is possible to insert two 12mm diameter drift pin iron rods into these holes and using a sledge hammer, hit the drift pin iron rods from the bottom to move the sliding shim plate upwards.

Shim Plate with slotted holes

Shim Plate after moving to the

UP position

Gap between the Trunnion base plate and

the Line Stop in the North side is 0mm

Gap between the Trunnion base plate and

the Line Stop in the North side is 20mm

Pipe Support showing the position of bolted Shim Plate during the normal operating condition

Pipe Support showing the position of bolted Shim Plate during the USM removal

VIEW LOOKING EAST

14mm holes on the support steel 12mm diameter

drift pin rods inserted in the holes

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Step 5. Removal of flange bolts at the North side of USM Remove all the bolts from the flange joint that connects the USM with the piping in the North side. Step 6. Mounting of Zero-Gap Mechanical Flange Spreader (ZG11TM) on the North side USM Flange Connection. Mount the Equalizer Zero-Gap II Bolt Hole Spreader (ZG11TM) on to the North side USM Flange Assembly at the top side flange blot holes and the bottom side flange holes as shown on the figure below.

Follow the instructions that are given in the Zero-Gap Mechanical Flange Spreader (ZG11TM) instruction manual for its installation and operation. Note: 1) The instruction manual for Zero-Gap Mechanical Flange Spreader is attached in Appendix 4.2 of this document. 2) The installation procedure for NORSOK compact flanges is attached in Appendix 4.3 of this document

Flange Joint Connecting USM to the Pipe at the North side of USM

View Looking East Figure Showing the Zero-Gap Mechanical Flange Spreader Attached to the USM Flange Joint at the North side of USM

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By turning the drive torque wrench start spreading the flanges by tensioning the actuator bolts. Continue spreading the flanges until the access gap between the flanges reaches 35mm.

35mm Gap between the Flanges

Figure Showing the Flanges in the Separated Position

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At this point: a) The piping in the North side of the USM is expected to move towards North by 20mm and the Trunnion base plate is expected to touch the Line Stop in the North side.

View Looking East Figure Showing the Pipe Support on the Bend after

the Pipe is displaced towards North by 20mm

No Gap between Trunnion base plate

and Line Stop

20mm Gap between Trunnion base plate and Line Stop

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b) The USM and piping in the South side is expected to move towards South by around 15mm and the Trunnion base plate is expected to touch the Limit Stop in the South side.

Figure Showing the Pipe Support on the South side of USM Before the Pipe is Displaced towards South by 15mm.

Bolted Shim Plate

U-Strap

15 mm Gap between Trunnion

base Plate and the Limit stop in the South Side

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Figure Showing the Pipe Support on the South side of USM after the Pipe is displaced towards South by 15mm.

15mm Gap between Trunnion base plate

and the Limit Stop in the North Side

No Gap between Trunnion

base plate and the Limit stop in the South Side

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5.2 Pipe Support Adjustments that are required for holding the pipe in the displaced position.

Once the flanges has been separated and prior to pull out the Seal-Ring, the piping should be held in the displaced position by re-adjusting the pipe supports on the North side (Trunnion elbow Support) and on the South side before pulling out the Seal-Ring. Warning!! The safety block included in the Zero-Gap Mechanical Flange Spreader should not be used to hold the pipe in the displaced position. This will be achieved by following the steps given below. Step 1. Adjustment of Sliding Line Stop in the South side at the Elbow Trunnion Support The bolted Line Stop in the South side of the support has got special slotted holes. The Line Stop can be moved towards the North by sliding through the special slotted holes to hold the pipe in the displaced position (20mm in the North).

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Do the following adjustment to this bolted Line Stop to hold the pipe in the displaced position. a) Loosen the two bolts that attach the Line Stop in the South side to the support steel. b) Slide the Line Stop through the slotted holes so that the gap between the Trunnion base plate and the Line stop in the South side becomes 0mm. c) Re-tighten the two bolts to fasten the Line Stop in the above described position.

Figure Showing the Pipe Support on the North side bend, holding the Pipe in the Displaced (20mm towards North) condition using Adjustable Line Stop in the South side.

Adjustable Line Stop slided through the slotted holes to hold the pipe in the displaced position

U-Strap in stand-by position with no support functions in the normal operating

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Step 2. Installation of the U-Strap around the Trunnion on the Bend. The Trunnion Support on the Bend in the North side of the USM is provided with a U-Strap that does not have any support function in the normal operating condition. But during the USM removal this U-strap is used to hold the piping in the displaced position (20mm towards North). Unbolt the U-strap from the Line Stop in the North side and install it around the Trunnion to hold the pipe in the displaced position as shown below.

Adjustable Line Stop slided through the slotted holes to hold the pipe in the displaced position

U-Strap around the Trunnion holding the pipe

in the displaced position

Figure Showing the Pipe Support on the North side bend, holding the Pipe in the Displaced (20mm towards North) condition using Adjustable Line Stop in the South

side and the U-Strap in the North side.

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No Gap between the Trunnion base plate

and the Line Stop

No Gap between the Trunnion base plate and the Adjustable Line Stop

Side View Showing the Pipe Support on the North side bend, holding the Pipe in the Displaced (20mm towards North) condition using Adjustable Line Stop in the South side and the U-Strap in the North side.

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Step 3. Adjustment of Bolted Shim Plate on the South side Trunnion Support. The Trunnion pipe support on the South side of the USM is provided with a bolted Shim plate. During the normal operating condition this shim plate does not have any pipe support function. But during the USM removal this Shim plate is used to hold the piping in the displaced position (15mm towards South). Remove the Shim plate by unbolting it from the North side and install it between the Trunnion base plate and the Limit Stop in the North side as shown on the figure below, to hold the pipe in the displaced condition.

Shim Plate in between the Trunnion base plate

and Limit Stop holding the pipe in the displaced

condition

Figure Showing the Pipe Support on the South side of USM, holding the Pipe in the Displaced (15mm towards South) condition using bolted Shim Plate

U-Strap in stand-by position with no support functions in the normal operating condition.

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Step 4. Installation of the U-Strap around the Trunnion on the South side Trunnion Support The Trunnion Support on the South side of the USM is provided with a U-Strap that does not have any support function in the normal operating condition. But during the USM removal this U-strap is used to hold the piping in the displaced position (15mm towards South). Un-bolt the U-strap from the Limit Stop in the South side and install it around the Trunnion to hold the pipe in the displaced position as shown below.

Figure Showing the Pipe Support on the South side of USM, holding the Pipe in the Displaced (15mm towards South) condition using bolted Shim Plate and U-Strap

Shim Plate in between the Trunnion base plate

and Limit Stop holding the pipe in the

displaced condition

U-Strap around the Trunnion holding the pipe in the displaced condition

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Step 5. Removal of Zero-Gap Mechanical Flange Spreader (ZG11TM) from the North side USM Flange Connection. Follow the instructions that are given in the Zero-Gap Mechanical Flange Spreader (ZG11TM) instruction manual for its removal from the Flange joint. Step 6. Removal of flange bolts at the South side of USM Remove all the bolts from the flange joint that connects the USM with the piping in the South side. Step 7. Mounting of Zero-Gap Mechanical Flange Spreader (ZG11TM) on the South side USM Flange Connection. Mount the Equalizer Zero-Gap II Bolt Hole Spreader (ZG11TM) on to the South side USM Flange Assembly at the top side flange blot holes and the bottom side flange holes as shown on the figure below. Follow the instructions that are given in the Zero-Gap Mechanical Flange Spreader (ZG11TM) instruction manual for its installation and operation.

Flange Joint Connecting USM to the Pipe at the South side of USM

View Looking East Figure Showing the Zero-Gap Mechanical Flange Spreader Attached to the USM Flange Joint at the South side of USM

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By turning the drive torque wrench start spreading the flanges by tensioning the actuator bolts. Continue spreading the flanges until the access gap between the flanges is enough to pull out the Seal-Ring.

Step 8. Removal of Zero-Gap Mechanical Flange Spreader (ZG11TM) from the South side USM Flange Connection. Follow the instructions that are given in the Zero-Gap Mechanical Flange Spreader (ZG11TM) instruction manual for its removal from the Flange joint.

Figure Showing the Flanges in the Separated Position

Gap between the flanges is enough to pull out the Seal-Ring

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Step 9. Lifting of USM using the Monorail The Metering Skid module is provided with Monorails above the USM. At this stage the USM can be lifted up using chain ropes connected to the Monorail.

Monorail for Lifting USM

USM being lifted up using chain ropes

Figure Showing the USM being lifted up using chain ropes connected to the Monorail above

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5.3 Pipe Support Adjustments that are required before re-starting the Metering Stream, after USM maintenance. Position the USM between the North side and South side connecting piping flanges using the chain ropes and the support the USM by temporary support from underneath. Step 1. Re-Adjusting the Bolted Line Stop at the Elbow Trunnion Support a) Loosen the two bolts that attach the Line Stop in the South side to the support steel. b) Slide the Line Stop through the slotted holes so that the gap between the Trunnion base plate and the Line stop in the South side becomes 20mm. c) Re-tighten the two bolts to fasten the Line Stop in the above described position.

20mm Gap between Trunnion Base Plate and the Bolted Line Stop

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Step 2. Re-Adjusting the U-Strap and the Sliding Shim Plate at the Elbow Trunnion Support Adjustments to the U-Strap: a) Remove the U-Strap that is holding the Trunnion, in a controlled manner so that the Pipe should not spring towards South side and hit the USM flange and damage the flange face. b) Bolt the U-Strap in the stand-by position onto the Line Stop as shown on the following figure. Adjustments to the Sliding Shim plate: a) Loosen the two bolts that attach the Shim Plate with the Line Stop b) Slide the Shim Plate towards down to shim the gap between the Trunnion base plate and the Line stop in the North side. c) Re-tighten the two bolts to fasten the Shim plate in the above described position.

No Gap between Trunnion Base Plate and the Bolted Line Stop

U-Strap in the Stand-by position

Shim Plate between the Trunnion Base Plate and the Line

Stop

Figure Showing the Final Position of the Elbow Trunnion Support Before Re-Starting the Metering Stream

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Step 3. Re-Adjustment of Bolted Shim Plate on the South side Trunnion Support. Unbolt the Shim plate between the Trunnion base plate and the Limit Stop in the North side and bolt it on to the Limit Stop in the Stand-by position as shown on the figure. At this point there is a Gap of 15mm between the Trunnion base plate and the North side Limit Stop.

If the bolted shim plate is jammed between the Trunnion base plate and the Limit Stop at the North side, it maybe difficult to remove. The Support steel is provided with two 14mm diameter holes. It is possible to insert two 12mm diameter drift pin iron rods into these holes and using a sledge hammer, hit the drift pin iron rods from the bottom to remove it.

15mm Gap between Trunnion Base Plate and

the Limit Stop

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Step 4. Re-Adjusting the U-Strap on the South side Trunnion Support. a) Remove the U-Strap that is holding the Trunnion, in a controlled manner so that the Pipe should not spring towards North side and hit the USM flange and damage the flange face. b) Bolt the U-Strap in the stand-by position onto the Limit Stop as shown on the following figure.

Shim Plate bolted in the Stand-by position

U-Strap in the Stand-by position

15mm Gap between the Trunnion base plate and the Limit Stop

Figure Showing the Final Position of the South side Trunnion Support Before Re-Starting the Metering Stream

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Step 5. Re-Adjusting Guide Gap on the Inlet Header Support. Ref. Data Point : 40 Pipe Support Tag : PS-M11-1289 a) Loosen the three bolts that attach the Guide in the North side to the support steel. b) Slide the Guide through the slotted holes to bring the Guide gap to 0mm in the North side of the support. c) Re-tighten the three bolts to fasten the Guide in the above described position.

Adjustable Guide in the North side slided through the slotted holes to bring

the Guide gap in the North side to 0mm

Figure Showing the Final Position of the Sliding Guide on the inlet header Support Before Re-Starting the Metering Stream

No gap between the Trunnion base plate and the Guide

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Step 6. Bolting up of the USM back into the connecting Metering Pipes. Bolt up the USM back into the connecting Metering Pipes in the North and the South sides of the Metering pipes. After bolting up of the USM, remove all the temporary supports that were provided for the USM during the step 5.3.

Warning!! Before re-staring the Metering Stream after maintenance of the USM, make sure that all the Metering Skid Pipe Supports are adjusted back into the normal operating position as shown on the figure on page 3, Section 4.GENERAL WARNINGS. Follow the procedure described in section 2 of the document titled PROCEDURE FOR USM EXCHANGE, Ref Document number BP-AK-EI190-KX-0168 for pressuring the metering run.

USM bolted up back into the Metering Stream

All temporary supports removed

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6. APPENDICES

6.1 Pipe Stress Isometrics and Pipe Support Drawings. 6.2 Zero-Gap Mechanical Flange Spreader Instruction Manual and Data Sheet. 6.3 Norsok Kompaktflenser Installsjonprosedyre. 6.4 Check List for USM Removal.

Client : StatoilHydro Statfjord B Aker Offshore Partner Project Name: Statfjord Late Life Project Page: 31 of 34 Doc. No: Date: 25.01.2009Titel : Pipe Support Adjustment Procedure for Flags Metering Skid Rev.: 1 During USM Maintenance.

6.1 Pipe Stress Isometrics and Pipe Support Drawings

Client : StatoilHydro Statfjord B Aker Offshore Partner Project Name: Statfjord Late Life Project Page: 32 of 34 Doc. No: Date: 25.01.2009Titel : Pipe Support Adjustment Procedure for Flags Metering Skid Rev.: 1 During USM Maintenance.

6.2 Zero-Gap Mechanical Flange Spreader Instruction Manual and Data Sheet

Client : StatoilHydro Statfjord B Aker Offshore Partner Project Name: Statfjord Late Life Project Page: 33 of 34 Doc. No: Date: 25.01.2009Titel : Pipe Support Adjustment Procedure for Flags Metering Skid Rev.: 1 During USM Maintenance.

6.3 Norsok Kompaktflenser Installsjonprosedyre

Client : StatoilHydro Statfjord B Aker Offshore Partner Project Name: Statfjord Late Life Project Page: 34 of 34 Doc. No: Date: 25.01.2009Titel : Pipe Support Adjustment Procedure for Flags Metering Skid Rev.: 1 During USM Maintenance.

6.4 Check List for USM Removal Procedure.