PM3-CAA-BRB SPECIAL OPERATION LIFTING PLAN / METHOD STATEMENT

Transfer 24” DSV from Supply Vessel onto Platform Using Rigging Equipment

Page 1 of 7

REVISION LOG

Revision Date DescriptionOriginal September 2003 Issued for ImplementationA October 2003 Issued to Client – Post Implementation

Page 2 of 7

1.1 Site Preparation / General Information

1. Carryout a site task based risk assessment and raise PTW if applicable. Hold Tool Box Talk with all parties involved at each stage of the workscope (including the vessel crew). Ensure all risk assessment control measures are communicated and understood by all relevant personnel. Refer to this method statement / lifting plan and ensure roles / responsibilities are clearly defined and understood.

2. The valve shall be delivered in a pre-slung lifting frame and will be positioned at the Stern Port quarter of the supply vessel. The valve will be stowed in the same orientation as when it is fitted to the riser. Weight of valve is 10 tonne. The weight of the frame and rigging is 2.5 tonne therefore Gross load will be 12.5 tonne. Pre –slung rigging will have sufficient WLL . Vessel air powered winches will be attached to the load to prevent any collusion between the load and vessel / platform structures when it is first lifted. Tag lines can be attached if required to aid load control. Any potential fouling points on the vessel will be identified and bumper bar protected

3. Carry out pre-operational checks on the air-powered winch. Ensure winch brakes are holding correctly at full capacity, stall test static brake if possible. The winch will have a minimum line pull of 4.25 tonne at the maximum number of rope wraps around the winch drum, when the load is at it highest elevation. The winch speed will be greater than the Lloyds requirement of 0.2m/s for a sealift at 0.5m mean wave height. If it is less than this then extended care and attention must be taken to ensure that the vessel does not impact the load upon initial lifting. The hoist rope will be rigged in a four-fall configuration. There will be an adequate and continuous volume of air supplied to the winch as per manufacturer’s recommendations.

4. Ensure all lifting equipment is available on the platform, is certified for use and

visually inspected prior to use. All lifting and pulling will be from approved lifting points on the platform structure. All lifting and pulling points are to be deemed suitable for the loads applied during all stages of the lifting (and pulling) operation by the client’s competent representative.

5. Due to the nature of this lifting operation utilising multiple items of lifting equipment and the dynamic amplification induced when lifting from a vessel this lift is classed as a complicated lift. Environmental conditions will not exceed a mean wave height of 0.5 metres beaufort scale 2

6. The initial lifting point will have a minimum WLL of 20 Tonne to allow for angle factors no less than 30, inclusive, from vertical when cross hauling the 12.5 Tonne load. The diagonal pull on the rigging equipment at 30 will be 14.5 Tonne. The diagonal pull at the angle midway between the winch wire and the rigging will be 18.2 Tonne therefore the lifting point will be suitable for these loads at this angle. The winch load will be 2.6 Tonne.

7. The initial lift off the boat may be subjected to dynamic amplification of up to 1.3 times i.e. 16.25Te. The associated diagonal pull at an angle midway between the winch wire and the rigging (including the dynamic factor) will be 20 Tonnes therefore the lifting point must be suitable for this load at this angle.

Page 3 of 7

8. The secondary lifting point will have a minimum WLL of 20.0 Tonne to have an allowance for angle factors no less than 30 inclusive from vertical, when cross hauling the 10 Tonne load. The diagonal pull on the rigging equipment at 30 will be 11.6 Tonne. The diagonal pull at the angle midway between the winch wire and the rigging will be 14.5 Tonne. Winch load will be 2.9 Tonne

9. The third lifting arrangement will consist of four 5 Tonne WLL manual chain hoists to enable final positioning of the valve. The chain blocks should be attached to the platform structure using accessories with a WLL of greater than 5 Tonne.

10. Cross hauling will be effected by two 3.2 WLL tirfor wire rope pulling machines. The pulling load will be shared equally between these tirfors They will be positioned below the deck level and attached to structure with suitable strength, as determined by competent client representative.

11. The air winch will be rigged to the outermost lifting point using a double sheave block. This lifting point is a fabricated Davit that extends from the platform structure over the sea to allow a vertical lift from a supply vessel. It will be deemed structurally suitable and load tested by the client competent person.

12. The range of the lift will be approx 16 meters. The horizontal distance of load movement will be a total of 6 meters in two 3 meter stages.

13. The load path will be clear of any obstructions to prevent collusion with the load.

14. Communication will be by radio and a designated signaller shall control the lifting operation when the load is being raised using the air-powered winch.

15. Only competent personnel shall perform the lifting operation and all unauthorised personnel are to be kept clear during the lifting operation. Erect barriers and warning signs around the work site.

16. The rigging team will consist of a minimum of six personnel. Signalman, Winch operator, tirfor operators and cargo handlers / riggers. Winch operator will obey the direction of the signalman at all times. All personnel can issue a stop signal.

17. There shall be a minimum of three crew members on the vessel

18. There will be safe access to the load, scaffold if required. If any personnel are working at height or over the side of the platform they will wear a safety harness and floatation device and a stand by vessel will be on station.

19. Supply Vessel Master will confirm that he can hold the vessel on station to enable the lift to be performed at a vertical angle.

20. If ALL personnel involved in the lift are satisfied that their task during the lift can be performed safely, the authorised person can give permission for the lift to proceed

Page 4 of 7

Page 5 of 7

1.2 Hoisting the valve from the vessel and settling to the Riser Protection Frame

1. Designated signalman shall instruct the air winch operator to lower the hook block to the vessel providing enough slack to allow for vessel drift and heave. Winch operator should ensure that the wire rope leaves the drum in a smooth manner.

2. The vessel crew are to attach the air winch hook block to the master link of the rigging arrangement on the load. The two platform tirfor wires will also be attached to the load-lifting frame at the two uppermost corners. There should be enough slack rope to allow for vessel drift and heave. The vessel winch restraining wire/s should also be attached to the lifting frame and slack rope taken up

3. Signal man to instruct the air winch operator to hoist slowly. Be aware of snagging points on the lifting arrangement. Winch operator to ensure that the wire rope spools smoothly back onto the winch drum.

4. Signal man to inform the air winch operator when the tension is to come onto the lifting arrangement ensuring that the lift centre of gravity is still vertical to the lifting point. All personnel will stand clear of the load as the tension is taken. Signal man to instruct the winch operator to lower if any problem occurs

5. The valve will be lifted from the vessel when the vessel is rising or / and at the top of its movement / heave. The lift will be carried out minimising dynamic amplification to the lifting arrangement as much as is possible. The vessel winch and tirfors should be used to control any swing in the load.

6. Once clear of the vessel deck the valve will be lifted approximately 2 metres and will then stop to allow the vessel winch operator to release slack in the retaining wires and to check the valve for security / stability and to check that the rigging arrangement is secure.

7. Signalman will instruct the air winch operator to continue hoisting slowly until the valve is at / just above the height of the riser protection frame.

8. The valve can then be pulled in using the two tirfor wire rope pullers. The vessel winch will continue to release slack in the retaining winch wire/s. Ensure that the sling master-link is always safely retained in the hook during cross hauling. Additional rigging equipment can be used to keep the load in balance, as it is cross-hauled into the platform.

9. Once the valve is in a position above the riser protection frame the signal man will instruct the air winch operator to lower the valve until it has settled to the riser protection frame, using the tirfor wire rope pullers and any additional rigging equipment to aid positioning.

10. The valve-lifting frame will then be secured to the riser protection frame using

rigging equipment. The vessel winch retaining wire/s can now be released and the vessel can move away.

11. Remove the valve lifting sling set from the air winch hook block.

Page 6 of 7

1.3 Hoisting the valve from the riser protection frame into final position

1. The air winch lifting arrangement will be rigged to the second Lifting point in its correct configuration, 4 fall.

2. Lower the air winch hook block and attach to the padeye on the valve body. Assess the centre of gravity and us additional rigging equipment to make the lift stable. The valve is rigged from fixed pad eye lifting points on the valve body and the load is balanced using additional rigging equipment.

3. Attach the two tirfors to the valve body using slings and shackles of suitable WLL, greater than 3 tonne.

4. The signalman will instruct the air winch operator to hoist slowly and take tension in the lifting arrangement. The valve will now be released from the lifting frame. The air winch will continue hoisting the valve from the lifting frame under the instruction of the signalman. Additional rigging equipment can be used to avoid the valve fouling on the frame as it is lifted

5. The air winch will continue hoisting until the valve is at a suitable height to be cross-hauled into the platform. The two tirfor wire rope pullers will be used to attain a side pull. The tirfors will be attached to the valve body using slings of sufficient WLL. Ensure that the slings or master-links are always safely retained in the air winch hook block during cross hauling.

6. Once the valve is in a position below the four 5 Tonne WLL manual chain blocks it will be transferred onto the chain blocks using the same lifting points on the valve Ensure that the weight of the valve is always evenly distributed between these chain blocks to avoid overloading them.

7. The chain bocks will take up the tension of the valve and the air winch and tirfor wire rope pullers can be released

8. Final positioning and adjustment will be made using the four 5 Tonne WLL manual chain blocks in unison.

9. The Valve will then be secured in position using four fixing bolts

10. All rigging equipment can be returned to the store and the job site tidied

Page 7 of 7