CN115676612A

CN115676612A - Method capable of realizing offshore replacement of inner tower type FPSO single-point electric slip ring

Info

Publication number: CN115676612A
Application number: CN202211373811.7A
Authority: CN
Inventors: 邱小波; 李春祥; 刘忠华; 倪令芹; 程朝阳; 庞广超; 朱丽娟; 梁海亮; 凌聪
Original assignee: CNOOC Energy Development of Equipment and Technology Co Ltd
Current assignee: CNOOC Energy Development of Equipment and Technology Co Ltd
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2023-02-03

Abstract

The invention discloses a method for realizing offshore replacement of an inner turret type FPSO single-point electrical slip ring, which comprises the following steps of hoisting and displacing a hatch cover of an inner turret type FPSO single-point cabin, hoisting, disassembling and repairing an electrical slip ring in the inner turret type FPSO single-point cabin, and finally reinstalling the hatch cover and the electrical slip ring, wherein the method comprises the following steps: s1: mounting a structural member for assisting in hoisting and hoisting equipment; s2: hoisting and moving the hatch cover; s3: hoisting, disassembling and moving the electric slip ring; s4: transporting the electric slip ring to an engineering maintenance point; s5: after the electric slip ring is maintained at an engineering maintenance point, the electric slip ring is transported back to the inner rotating tower type FPSO single-point cabin, the electric slip ring and the hatch cover are installed again, and the installation sequence and the disassembly sequence of the hatch cover and the electric slip ring are opposite. The method has the advantages of being convenient to operate, safe, reliable and capable of meeting the requirement for completing operation in a short time, and a complete quick processing mechanism for breakdown rush repair of the electric slip ring is achieved.

Description

Method for realizing offshore replacement of inner rotating tower type FPSO single-point electrical slip ring

Technical Field

The invention relates to the technical field of ocean engineering, in particular to a method capable of realizing offshore replacement of an internal turret type FPSO single-point electrical slip ring.

Background

FPSO generally refers to a floating production storage and offloading device, which is a comprehensive large offshore crude oil processing plant integrating functions of crude oil production, storage, export and the like, using a ship or barge as a supporting structure, widely applied to an offshore oil exploitation and processing operation site, and generally fixed on the sea surface in a single-point mooring mode.

The electric slip ring in the inner rotating tower type FPSO single-point cabin is used for the power output function of an oil field, once a fault occurs, the power supply to a platform is interrupted, the platform cannot be produced, the economic loss is huge, the production technology of the electric slip ring is monopolized by a few international manufacturers, maintenance equipment is lacked in China, the direct maintenance of the electric slip ring cannot be carried out on site, the electric slip ring needs to be detached from the inner rotating tower type FPSO single-point cabin and is transported to a maintenance manufacturer on the land for maintenance, meanwhile, the change of the electric slip ring is generally realized by two modes, namely, the mode needs to depend on a large hoisting ship to carry out offshore hoisting operation, the mode can complete the operation in a short time, but the operation cost is very high, the mode waits for the operation of the FPSO during entering a dock, the mode can borrow the crane for operation of the factory crane, but the time for waiting the FPSO to enter the dock is long, and the efficiency of handling the FPSO is low.

Disclosure of Invention

The invention aims to provide a method for realizing offshore replacement of an inner turret type FPSO single-point electrical slip ring, which has the advantages of convenience in operation, safety, reliability and short-time completion of operation, and realizes a complete set of rapid electrical slip ring fault repair processing mechanism for offshore replacement or disassembly and transportation to land maintenance when an inner turret type FPSO single-point electrical slip ring fails.

In order to achieve the purpose, the invention adopts the following technical scheme:

the method for realizing offshore replacement of the inner tower type FPSO single-point electric slip ring comprises the following steps of hoisting and displacing a hatch cover of an inner tower type FPSO single-point cabin, hoisting, disassembling and repairing an electric slip ring inside the inner tower type FPSO single-point cabin, and finally reinstalling the hatch cover and the electric slip ring, and specifically comprises the following steps:

s1: mounting a structural member for assisting in hoisting and hoisting equipment;

s1-1: a first hoisting upright post, a second hoisting upright post, a third hoisting upright post and a fourth hoisting upright post are erected outside the inner rotating tower type FPSO single-point cabin, the first hoisting upright post, the second hoisting upright post, the third hoisting upright post and the fourth hoisting upright post are symmetrically arranged between two pairs of the first hoisting upright post and the second hoisting upright post, a cantilever structural member is respectively arranged on the first hoisting upright post and the second hoisting upright post, a first installation lifting lug is arranged at the horizontal section of the cantilever structural member, and second installation lifting lugs are respectively arranged on the side surfaces of the third hoisting upright post and the fourth hoisting upright post;

s1-2: a fixed truss is erected outside the inner rotating tower type FPSO single-point cabin, the fixed truss comprises a support frame and a cross beam arranged on the support frame, and at least four third mounting lifting lugs are arranged on the cross beam;

s1-3: a hoisting structure beam is erected outside the inner rotating tower type FPSO single-point cabin, the height of the hoisting structure beam is not less than that of a cross beam, a hoisting traction winch is arranged on the hoisting structure beam, and the hoisting structure beam is provided with a tubular lifting lug which downwards corresponds to the inner rotating tower type FPSO single-point cabin;

s2: hoisting and moving the hatch cover;

s2-1: the hatch cover is characterized in that the surface of the hatch cover is provided with an upper left auxiliary lifting lug, a lower left auxiliary lifting lug, an upper right auxiliary lifting lug and a lower right auxiliary lifting lug, two first mounting lifting lugs are respectively provided with a first electric hoist, two second mounting lifting lugs are respectively provided with a second electric hoist, the two first electric hoists are correspondingly connected to the upper left auxiliary lifting lug and the lower left auxiliary lifting lug through steel wire lifting ropes, and the two second electric hoists are correspondingly connected to the upper right auxiliary lifting lug and the lower right auxiliary lifting lug through the steel wire lifting ropes;

s2-2: disassembling screws on the hatch cover, starting the second electric hoist firstly, lifting one side of the hatch cover, then starting the first electric hoist, following the second electric hoist, lifting the other side of the hatch cover, stopping lifting when the hatch cover rises to a certain height, observing the lifting state of the hatch cover, and executing the next step after confirming that each lifting point is stable and has no abnormity;

s2-3: the second electric hoist slowly puts down the steel wire lifting rope, the first electric hoist continues to pull and retract the steel wire lifting rope, so that one side of the hatch cover slowly descends, the other side of the hatch cover is lifted until one side of the hatch cover moves and is attached to the edge of the inner turret type FPSO single-point hatch, the first electric hoist and the second electric hoist are stopped, the first electric hoist tensions the steel wire lifting rope, the second electric hoist is in a rope loosening state, a stop block is installed at the edge of the inner turret type FPSO single-point hatch and is used for stopping one side of the hatch cover, and the inner turret type FPSO single-point hatch is completely opened;

s3: hoisting, disassembling and moving the electric slip ring;

s3-1: the hoisting lock is installed at the top of the electric slip ring, at least three first traction lifting lugs are radially and symmetrically installed at the top of the electric slip ring, a second traction lifting lug and a third traction lifting lug are installed on the side face of the electric slip ring, the second traction lifting lug and the third traction lifting lug are arranged up and down and are positioned on the same vertical line, a third electric hoist is installed on the tubular lifting lug, the third electric hoist is connected to the three first traction lifting lugs through a steel wire lifting rope, and the hoisting traction winch is connected to the hoisting lock through the steel wire lifting rope;

s3-2: detaching a connecting member of the electric slip ring, starting a third electric hoist, slowly and vertically lifting the electric slip ring, simultaneously controlling an anti-rotation guide chain at the bottom of the electric slip ring to enable the electric slip ring to leave the mounting base and be 0.1m away from the mounting base, stopping lifting, observing the lifting state of the electric slip ring, and executing the next step after confirming that each lifting point is stable and has no abnormality;

s3-3: the third electric hoist continues to vertically lift the electric slip ring until the distance between the electric slip ring and the mounting base is 1m, the electric slip ring stops lifting, and a plurality of temporary buttresses are mounted on the mounting base;

s3-4: after the temporary buttress is installed, the third electric hoist slowly discharges the slip ring downwards, the flange surface and the bolt hole at the bottom of the electric slip ring are aligned and contacted with the temporary buttress, the downward discharging is stopped, the temporary buttress and the electric slip ring are fixed together through screws, and then an operator cuts an internal cable of the electric slip ring from a gap space of the temporary buttress;

s3-5: after the internal cable of the electric slip ring is cut, screws between the temporary buttress and the electric slip ring are disassembled, the third electric hoist vertically lifts the electric slip ring to be 1.5m away from the temporary buttress, the hoisting and traction winch tensions a steel wire lifting rope, and the hoisting and traction winch and the third electric hoist are both in a bearing state at the moment;

s3-6: the third electric hoist slowly and vertically releases the discharging slip ring, so that the hoisting and traction winch continuously tensions the steel wire lifting rope to gradually achieve complete stress, and after the third electric hoist and the hoisting and traction winch complete relay transfer in the vertical direction, the third electric hoist keeps an emergency standby state, synchronously acts with the hoisting and traction winch, but does not bear load;

s3-7: when the hoisting and traction winch slowly lifts the electric slip ring, the fourth electric hoist, the fifth electric hoist, the sixth electric hoist and the seventh electric hoist are correspondingly arranged on the four third mounting lifting lugs, and the fourth electric hoist, the fifth electric hoist, the sixth electric hoist and the seventh electric hoist are sequentially arranged from near to far according to the distance between the fourth electric hoist, the fifth electric hoist, the sixth electric hoist and the seventh electric hoist and the electric slip ring;

s3-8: when a second traction lifting lug on the electric slip ring is lifted to the position above the inner turret type FPSO single-point hatch, a fourth electric hoist and a fifth electric hoist are connected to the second traction lifting lug through steel wire lifting ropes;

s3-9: the sixth electric hoist slowly retracts the steel wire lifting rope to enable the electric slip ring to start to turn right, meanwhile, the fourth electric hoist retracts the steel wire lifting rope to reduce the integral right translation amount of the electric slip ring, and at the moment, the electric slip ring is in a 15-degree inclined state relative to the horizontal plane;

s3-10: the fourth electric hoist and the sixth electric hoist continue to slowly retract and pull the steel wire lifting rope, when the fourth electric hoist reaches the shortest rope retracting limit, the electric slip ring is in a 30-degree inclined state relative to the horizontal plane, the steel wire lifting rope is lowered by the hoisting and traction winch, and the lowering distance is controlled on the basis that the fourth electric hoist continues to bear force and the electric slip ring is not in contact with the inner rotating tower type FPSO single-point hatch;

s3-11: the fourth electric hoist and the sixth electric hoist continue to slowly retract and pull the steel wire lifting rope, when the fourth electric hoist reaches the shortest rope retracting limit, the hoisting traction winch lowers the steel wire lifting rope, the lowering distance is controlled on the basis that the fourth electric hoist continues to bear force, the electric slip ring does not contact with the inner rotating tower type FPSO single-point hatch, and when the electric slip ring is in a 45-degree inclined state relative to the horizontal plane, the bottom of the electric slip ring approaches to move out of the inner rotating tower type FPSO single-point hatch;

s3-12: the fourth electric hoist and the sixth electric hoist continue to slowly retract and pull the steel wire lifting rope, when the fourth electric hoist reaches the shortest rope retracting limit, the hoisting traction winch descends the steel wire lifting rope, the descending distance is controlled on the basis that the fourth electric hoist continues to bear force, the electric slip ring does not contact with the single-point hatch of the inner rotating tower type FPSO, and when the electric slip ring is inclined at 60 degrees relative to the horizontal plane, the bottom of the electric slip ring moves out of the single-point hatch of the inner rotating tower type FPSO;

s3-13: when the bottom of the electric slip ring leaves the inner turret type FPSO single-point hatch, the fifth electric hoist and the seventh electric hoist slowly retract and pull the steel wire lifting rope, and meanwhile, the hoisting traction winch, the fourth electric hoist and the sixth electric hoist all lower the steel wire lifting rope, so that the hoisting of the electric slip ring is transferred from the fourth electric hoist and the sixth electric hoist to the fifth electric hoist and the seventh electric hoist, the hoisting traction winch unloads force, and the electric slip ring begins to leave the inner turret type FPSO single-point hatch;

s3-14: when the electric slip ring is completely supported by the fifth electric hoist and the seventh electric hoist, the hoisting and traction winch, the fourth electric hoist and the sixth electric hoist are all unloaded, and the electric slip ring completely leaves the inner rotating tower type FPSO single-point hatch;

s3-15: placing a moving trolley below the electric slip ring, simultaneously placing the fifth electric hoist and the seventh electric hoist to lower the steel wire lifting ropes, placing the electric slip ring on the moving trolley, tightening and fixing the electric slip ring by using a binding band, and finally unfastening all the steel wire lifting ropes;

s4: the transfer trolley firstly transports the electric slip ring to a ship loading and hoisting area of the FPSO, the electric slip ring is hoisted and fixed on a ship loading fixing frame of a transport ship by using a hoist of the FPSO, and after the transport ship is transported and leaned against the shore, the electric slip ring is hoisted to a land transport frame and then transported to an engineering maintenance point;

s5: after the electric slip ring is maintained at an engineering maintenance point, the electric slip ring is transported back to the inner rotating tower type FPSO single-point cabin, the electric slip ring and the hatch cover are installed again, and the installation sequence and the disassembly sequence of the hatch cover and the electric slip ring are opposite.

Further, in S2-3, a fixed lifting lug is arranged on the inner side surface of the hatch cover, and the fixed lifting lug is fixed on a deck upright post of the FPSO through a chain block.

Further, in the step S2-3, the stop block is fixed on the edge of the single-point hatch of the inner turret type FPSO through screws.

Further, in S1-2, the bottom of the cross beam is configured as a rail groove structure, and the third mounting lug is slidably disposed on the cross beam.

Further, in S1-3, the hoisting structure beam is further provided with a guide pulley, and in S3-1, the wire rope of the hoisting traction winch is connected to the hoisting lock via the guide pulley.

Further, in S3-15, a groove rib plate for matching with the electric slip ring is arranged on the surface of the moving trolley.

The invention has the beneficial effects that: compared with the traditional processing mode in the prior art, the method has been successfully tested in the ocean 111FPSO, is completed three days ahead of the scheduled construction period, is safe and smooth in the whole operation process, embodies the high efficiency and feasibility of the method, has the advantages of convenient operation, safety, reliability and short operation time, and reduces the economic loss to the maximum extent.

Drawings

Fig. 1 is a front view showing a connection relationship between a structural member for auxiliary hoist and a hatch cover in the present invention.

Fig. 2 is a plan view showing the connection relationship between the structural members for auxiliary hoist and the hatch cover in the present invention.

Fig. 3 is a schematic view of hatch cover lifting displacement (one).

Fig. 4 is a schematic diagram of the hatch cover lifting displacement (two).

Fig. 5 is a schematic view of hatch cover lifting displacement (three).

Fig. 6 is a schematic diagram of hatch cover lifting displacement (IV).

Fig. 7 is a schematic diagram of hatch cover hoisting displacement (v).

Fig. 8 is a schematic view of hatch cover lifting displacement (six).

Fig. 9 is a schematic view of the hatch cover lifting displacement (seven).

Fig. 10 is a schematic diagram of the hoisting and dismounting (one) of the electric slip ring.

Fig. 11 is a schematic diagram of the hoisting and dismounting (II) of the electric slip ring.

Fig. 12 is a schematic diagram of hoisting and dismounting (III) of the electric slip ring.

Fig. 13 is a schematic diagram of the hoisting and dismounting (IV) of the electric slip ring.

Fig. 14 is a schematic diagram of the electrical slip ring hoisting displacement (one).

Fig. 15 is a schematic diagram of the hoisting displacement (two) of the electric slip ring.

Fig. 16 is a schematic diagram of the electrical slip ring hoisting displacement (three).

Fig. 17 is a schematic diagram of the electrical slip ring hoisting displacement (four).

Fig. 18 is a schematic diagram of the electrical slip ring hoisting displacement (v).

Fig. 19 is a schematic diagram of the electrical slip ring hoisting displacement (six).

Fig. 20 is a schematic diagram of the electrical slip ring hoisting displacement (seven).

Fig. 21 is a schematic diagram of the electrical slip ring hoisting displacement (eight).

Fig. 22 is a schematic diagram of the electrical slip ring hoisting displacement (nine).

Fig. 23 is a schematic structural view of the transfer cart of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in fig. 1 to 23, a method for replacing an internal turret type FPSO single-point electrical slip ring on the sea is provided, where the method includes the steps of hoisting and displacing a hatch cover 1A of an internal turret type FPSO single-point cabin 1, hoisting, detaching, repairing an electrical slip ring 1B inside the internal turret type FPSO single-point cabin, and finally reinstalling the hatch cover 1A and the electrical slip ring 1B, and specifically includes the following steps:

s1-1: a first hoisting upright post 2, a second hoisting upright post 3, a third hoisting upright post 4 and a fourth hoisting upright post 5 are erected outside the inner rotating tower type FPSO single-point cabin 1, the first hoisting upright post 2, the second hoisting upright post 3, the third hoisting upright post 4 and the fourth hoisting upright post 5 are symmetrically arranged between two pairs of the first hoisting upright post 2 and the second hoisting upright post 3, a cantilever structural member 6 is respectively arranged on the first hoisting upright post 2 and the second hoisting upright post 3, a first mounting lug 7 is arranged at the horizontal section of the cantilever structural member 6, and second mounting lugs 8 are respectively arranged on the side surfaces of the third hoisting upright post 4 and the fourth hoisting upright post 5;

s1-2: a fixed truss 9 is erected outside the inner rotating tower type FPSO single-point cabin 1, the fixed truss 9 comprises a support frame 10 and a cross beam 11 arranged on the support frame 10, at least four third installation lifting lugs 12 are arranged on the cross beam 11, the bottom of the cross beam 11 is of a guide rail groove structure, and the third installation lifting lugs 12 are arranged on the cross beam 11 in a sliding manner;

s1-3: a hoisting structure beam 13 is erected outside the inner rotating tower type FPSO single-point cabin 1, the height of the hoisting structure beam 13 is not less than that of the cross beam 11, a hoisting traction winch 14 is arranged on the hoisting structure beam 13, the hoisting structure beam 13 is provided with a tubular lifting lug 15 which downwards corresponds to the inner rotating tower type FPSO single-point cabin 1, and the hoisting structure beam 13 is further provided with a guide pulley 30;

s2: hoisting and shifting the hatch cover 1A;

s2-1: the hatch cover 1A is provided with a left upper auxiliary lifting lug 16, a left lower auxiliary lifting lug 17, a right upper auxiliary lifting lug 18 and a right lower auxiliary lifting lug 19 on the surface, two first mounting lifting lugs 7 are respectively provided with a first electric hoist 7A, two second mounting lifting lugs 8 are respectively provided with a second electric hoist 8A, the two first electric hoists 7A are correspondingly connected to the left upper auxiliary lifting lug 16 and the left lower auxiliary lifting lug 17 through steel wire lifting ropes, and the two second electric hoists 8A are correspondingly connected to the right upper auxiliary lifting lug 18 and the right lower auxiliary lifting lug 19 through the steel wire lifting ropes;

s2-2: disassembling screws on the hatch cover 1A, starting the second electric hoist 8A, lifting one side of the hatch cover 1A, starting the first electric hoist 7A, following the second electric hoist 8A, lifting the other side of the hatch cover 1A, stopping lifting when the hatch cover 1A rises to a certain height, observing the lifting state of the hatch cover 1A, and executing the next step after confirming that each lifting point is stable and abnormal;

s2-3: the second electric hoist 8A slowly releases the steel wire lifting rope, the first electric hoist 7A continues to pull the steel wire lifting rope, so that one side of the hatch cover 1A slowly descends, the other side of the hatch cover 1A is lifted until one side of the hatch cover 1A moves and is attached to the edge of the opening of the inner turret type FPSO single-point cabin 1, the first electric hoist 7A and the second electric hoist 8A are stopped, the first electric hoist 7A tensions the steel wire lifting rope, the second electric hoist 8A is in a rope loosening state, then a stop block 20 is installed at the edge of the opening of the inner turret type FPSO single-point cabin 1, the stop block 20 is fixed to the edge of the opening of the inner turret type FPSO single-point cabin 1 through screws, the stop block 20 is abutted to one side of the hatch cover 1A, a fixing lifting lug 27 is arranged on the inner side face of the hatch cover 1A, the fixing lifting lug 27 is fixed to a deck upright 29 of the FPSO through a chain block 28, and the opening of the inner turret type FPSO cabin 1 opening completely;

s3: hoisting, disassembling and shifting the electric slip ring 1B;

s3-1: the top of the electric slip ring 1B is provided with a hoisting lock 21, the top of the electric slip ring 1B is radially and symmetrically provided with at least three first traction lifting lugs 22, the side surface of the electric slip ring 1B is provided with a second traction lifting lug 23 and a third traction lifting lug 24, the second traction lifting lug 23 and the third traction lifting lug 24 are arranged up and down and are positioned on the same vertical line, the tubular lifting lug 15 is provided with a third electric hoist 15A, the third electric hoist 15A is connected to the three first traction lifting lugs 22 through a steel wire hoisting rope, and the steel wire hoisting rope of the traction hoisting winch 14 is connected to the hoisting lock 21 through a guide pulley 30;

s3-2: detaching a connecting member of the electric slip ring 1B, starting a third electric hoist 15A, slowly and vertically lifting the electric slip ring 1B, simultaneously controlling an anti-rotation guide chain at the bottom of the electric slip ring 1B, enabling the electric slip ring 1B to leave the mounting base 1C and be 0.1m away from the mounting base 1C, stopping lifting, observing the lifting state of the electric slip ring 1B, and executing the next step after confirming that each lifting point is stable and abnormal;

s3-3: the third electric hoist 15A continues to vertically lift the electric slip ring 1B until the distance between the electric slip ring 1B and the mounting base 1C is 1m, the lifting is stopped, and a plurality of temporary buttresses 25 are mounted on the mounting base 1C;

s3-4: after the temporary buttress 25 is installed, the third electric hoist 15A slowly releases the electric slip ring 1B, the flange surface and the bolt hole at the bottom of the electric slip ring 1B are aligned and contacted with the temporary buttress 25, the releasing is stopped, the temporary buttress 25 and the electric slip ring 1B are fixed together through screws, and then an operator shears the internal cable of the electric slip ring 1B from the gap space of the temporary buttress 25;

s3-5: after the internal cable of the electric slip ring 1B is cut, screws between the temporary buttress 25 and the electric slip ring 1B are disassembled, the third electric hoist 15A vertically lifts the electric slip ring 1B to 1.5m away from the temporary buttress 25, the hoisting traction winch 14 tightens a steel wire lifting rope, and the hoisting traction winch 14 and the third electric hoist 15A are both in a bearing state at the moment;

s3-6: the third electric hoist 15A slowly and vertically discharges the discharging slip ring 1B, so that the hoisting and traction winch 14 continuously tensions the steel wire lifting rope, complete stress is gradually achieved, and after the third electric hoist 15A and the hoisting and traction winch 14 complete relay handover in the vertical direction, the third electric hoist 15A keeps an emergency standby state, synchronously acts with the hoisting and traction winch 14, but does not bear load;

s3-7: when the hoisting and traction winch 14 slowly lifts the electric slip ring 1B, the four third mounting lugs 12 are correspondingly provided with a fourth electric hoist 12A, a fifth electric hoist 12B, a sixth electric hoist 12C and a seventh electric hoist 12D, and the fourth electric hoist 12A, the fifth electric hoist 12B, the sixth electric hoist 12C and the seventh electric hoist 12D are sequentially arranged from near to far according to the distance between the hoisting and traction winch and the electric slip ring 1B;

s3-8: when the second traction lifting lug 23 on the electric slip ring 1B is lifted to the position above the opening of the inner tower type FPSO single-point cabin 1, the fourth electric hoist 12A and the fifth electric hoist 12B are connected to the second traction lifting lug 23 through steel wire lifting ropes, when the third traction lifting lug 24 on the electric slip ring 1B is lifted to the position above the opening of the inner tower type FPSO single-point cabin 1, the sixth electric hoist 12C and the seventh electric hoist 12D are connected to the third traction lifting lug 24 through steel wire lifting ropes, at the moment, the hoisting traction winch 14 stops lifting the electric slip ring 1B, and the fourth electric hoist 12A and the fifth electric hoist 12B tighten the steel wire lifting ropes;

s3-9: the sixth electric hoist 12C slowly retracts the steel wire lifting rope, so that the electric slip ring 1B starts to turn right, and meanwhile, the fourth electric hoist 12A retracts the steel wire lifting rope, so that the integral right translation amount of the electric slip ring 1B is reduced, and at the moment, the electric slip ring 1B is in a 15-degree inclined state relative to the horizontal plane;

s3-10: the fourth electric hoist 12A and the sixth electric hoist 12C continue to slowly retract the steel wire lifting rope, when the fourth electric hoist 12A reaches the shortest rope retracting limit, the electric slip ring 1B is in a 30-degree inclined state relative to the horizontal plane, the hoisting traction winch 14 lowers the steel wire lifting rope, and the lowering distance is controlled by taking the fourth electric hoist 12A continuously stressed and the electric slip ring 1B not in contact with the mouth 1 of the inner tower type FPSO single-point cabin as a reference;

s3-11: the fourth electric hoist 12A and the sixth electric hoist 12C continue to slowly draw the steel wire lifting rope, when the fourth electric hoist 12A reaches the shortest rope drawing limit, the hoisting and traction winch 14 is lifted to lower the steel wire lifting rope, the lowering distance is controlled on the basis that the fourth electric hoist 12A continues to be stressed, and the electric slip ring 1B is not in contact with the mouth 1 of the inner rotating tower type FPSO single-point cabin, and when the electric slip ring 1B is in a 45-degree inclined state relative to the horizontal plane, the bottom of the electric slip ring 1B approaches to move out of the mouth 1 of the inner rotating tower type FPSO single-point cabin;

s3-12: the fourth electric hoist 12A and the sixth electric hoist 12C continue to slowly retract the steel wire lifting rope, when the fourth electric hoist 12A reaches the shortest rope retracting limit, the hoisting winch 14 is hoisted to lower the steel wire lifting rope, the lowering distance is controlled on the basis that the fourth electric hoist 12A continues to be stressed, the electric slip ring 1B does not contact with the opening of the inner tower type FPSO single-point cabin 1, and when the electric slip ring 1B is in a 60-degree inclined state relative to the horizontal plane, the bottom of the electric slip ring 1B is moved out of the opening of the inner tower type FPSO single-point cabin 1;

s3-13: after the bottom of the electric slip ring 1B leaves the opening of the inner tower type FPSO single-point cabin 1, the fifth electric hoist 12B and the seventh electric hoist 12D slowly retract and pull the steel wire lifting rope, meanwhile, the hoisting traction winch 14, the fourth electric hoist 12A and the sixth electric hoist 12C all lower the steel wire lifting rope, so that the hoisting of the electric slip ring 1B is transferred from the fourth electric hoist 12A and the sixth electric hoist 12C to the fifth electric hoist 12B and the seventh electric hoist 12D, the hoisting traction winch 14 unloads force, and the electric slip ring 1B begins to be far away from the opening of the inner tower type FPSO single-point cabin 1;

s3-14: after the electric slip ring 1B is completely supported by the fifth electric hoist 12B and the seventh electric hoist 12D, the hoisting traction winch 14, the fourth electric hoist 12A and the sixth electric hoist 12C are all unloaded, and the electric slip ring 1B completely leaves the opening of the inner tower type FPSO single-point cabin 1;

s3-15: placing a moving trolley 26 below the electric slip ring 1B, simultaneously placing steel wire lifting ropes on a fifth electric hoist 12B and a seventh electric hoist 12D, placing the electric slip ring 1B on the moving trolley 26, tightening and fixing by using binding bands, and finally unfastening all the steel wire lifting ropes, wherein a groove rib plate 31 matched with the electric slip ring 1B is arranged on the surface of the moving trolley 26;

s4: the transfer trolley 26 firstly transports the electric slip ring 1B to a ship loading and hoisting area of the FPSO, a crane of the FPSO is used for hoisting and fixing the electric slip ring 1B to a ship loading fixing frame of a transport ship, and after the transport ship is transferred and leaned against the shore, the electric slip ring 1B is hoisted to a land transport frame and then transported to an engineering maintenance point;

s5: after the electric slip ring 1B is repaired at the engineering maintenance point, the electric slip ring is transported back to the inner rotating tower type FPSO single-point cabin 1, the electric slip ring 1B and the hatch cover 1A are installed again, and the installation sequence and the disassembly sequence of the hatch cover 1A and the electric slip ring 1B are opposite.

In this embodiment, as can be seen from fig. 1 and fig. 2, a first hoisting column 2, a second hoisting column 3, a third hoisting column 4, and a fourth hoisting column 5 are set up outside the internal turret FPSO single-point cabin 1 in advance, the first hoisting column 2 and the second hoisting column 3 are connected to the upper left and lower left of the hatch cover 1A through a first electric hoist 7A, and the third hoisting column 4 and the fourth hoisting column 5 are connected to the upper right and lower right of the hatch cover 1A through a second electric hoist 8A, so as to prepare for the subsequent stable lifting of the hatch cover 1A.

In this embodiment, as can be seen from fig. 3 to 9, it shows the procedure of the steps of lifting and shifting the hatch cover 1A, first lifting one side of the hatch cover 1A to a certain height, then lifting the other side of the hatch cover 1A, while the hatch cover 1A leaves the opening of the internal turret type FPSO single-point cabin 1, avoiding the hatch cover 1A from being damaged due to collision with the edge of the internal turret type FPSO single-point cabin 1 during the process of lowering one side of the hatch cover 1A, lifting the other side of the hatch cover 1A, lowering one side of the hatch cover 1A to shift and place the hatch cover 1A beside the opening of the internal turret type FPSO single-point cabin 1, and finally tensioning the other side of the hatch cover 1A by the steel wire lifting rope of the first electric hoist 7A, and it is fixed unchangeable, FPSO's deck stand 29 is connected to the fixed lug 27 of hatch board 1A medial surface through the chain block 28, avoid hatch board 1A to lead to first electric block 7A's steel wire lifting rope to bear bigger pulling force because of the FPSO hull rocks back and forth, at last at the marginal installation dog 20 of turret formula FPSO single-point cabin 1 including, dog 20 is used for keeping out one side of hatch board 1A, avoid hatch board 1A lapse, and then avoid first electric block 7A's steel wire lifting rope and chain block 28 to bear bigger pulling force and cause easy fracture, after above-mentioned step is accomplished, alright realize the hoist and mount of hatch board 1A, aversion and fixed the placing, the subsequent quick installation of being convenient for of hatch board 1A's the position of placing.

In this embodiment, as can be seen from fig. 10 to 13, it shows a flow of the steps of detaching and hoisting the electrical slip ring 1B from the mounting base 1C, the electrical slip ring 1B is lifted after detaching the connecting member, and then is lowered to the temporary buttress 25 temporarily mounted on the mounting base 1C, so that the operator can cut the internal cable of the electrical slip ring 1B from the gap space of the temporary buttress 25, meanwhile, the temporary buttress 25 is used for supporting the electrical slip ring 1B, thereby preventing the steel wire lifting rope of the third electric hoist 15A from bearing a large pulling force for a long time due to always pulling the electrical slip ring 1B, and finally, the lifting operation of the electrical slip ring 1B is switched from the third electric hoist 15A to the hoisting traction winch 14, so that the hoisting winch 14 realizes vertical lifting of the electrical slip ring 1B, and the third electric hoist 15A and the hoisting traction winch 14 synchronously operate, thereby preventing the hoisting winch 14 from causing the falling and damaging of the electrical slip ring 1B due to accidental rope loosening, and ensuring the lifting stability and safety of the electrical slip ring 1B to the greatest extent.

In this embodiment, as can be seen from fig. 14 to 22, it shows the flow of the steps in which the electrical slip ring 1B leaves the inner tower type FPSO single-point cabin 1 and is horizontally placed on the transfer trolley 26, when the hoisting and hauling winch 14 is continuously lifted, the electrical slip ring 1B is limited by the height of the hoisting structure beam 13 and cannot be continuously lifted, at this time, the fourth electric hoist 12A, the fifth electric hoist 12B, the sixth electric hoist 12C and the seventh electric hoist 12D gradually incline the electrical slip ring 1B from the vertical hoisting state through the steel wire hoisting rope until the horizontal hoisting state is formed, it is required to describe that the bottom of the beam 11 is provided with a guide rail groove structure, the fourth electric hoist 12A, the fifth electric hoist 12B, the sixth electric hoist 12C and the seventh electric hoist 12D adjust the position at any time through the third mounting lug 12, the normal hoisting displacement of the electrical slip ring 1B is ensured, and the electrical slip ring 1B does not touch the opening of the inner tower type FPSO cabin 1 during the displacement, the damage is avoided, the electrical slip ring 1B collides with the horizontal slip ring 1B, so that the electrical slip ring 1B can be placed on the horizontal transfer trolley, and the horizontal transfer trolley is stably placed on the surface of the transfer trolley 26, and the electrical slip ring 1B is placed in order to ensure the safety of the horizontal transfer trolley 26.

And finally, the electric slip ring 1B leaves the current position by using the transfer trolley 26, passes through a ship loading and hoisting area, a transport ship and a land transport frame of the FPSO in sequence, is finally transferred to an engineering maintenance point on the land to realize maintenance operation, and is transferred back to the inner turret type FPSO single-point cabin 1 after the maintenance of the electric slip ring 1B is finished and is reinstalled to realize offshore replacement and maintenance work of the electric slip ring 1B.

Compared with the traditional processing mode in the prior art, the method has been successfully tested in the ocean 111FPSO, is completed three days ahead of the scheduled construction period, is safe and smooth in the whole operation process, reflects the high efficiency and feasibility of the method, and has the advantages of convenience in operation, safety, reliability and short operation time, and the economic loss is reduced to the maximum extent.

Claims

1. A method capable of realizing offshore replacement of an inner tower type FPSO single-point electric slip ring is characterized by comprising the following steps: the method comprises the steps of hoisting and displacing a hatch cover (1A) of an inner rotating tower type FPSO single-point cabin (1), hoisting, disassembling and repairing an electric slip ring (1B) in the inner rotating tower type FPSO single-point cabin, and finally reinstalling the hatch cover (1A) and the electric slip ring (1B), and specifically comprises the following steps:

s1-1: a first hoisting upright post (2), a second hoisting upright post (3), a third hoisting upright post (4) and a fourth hoisting upright post (5) are erected outside the inner rotating tower type FPSO single-point cabin (1), the first hoisting upright post (2), the second hoisting upright post (3), the third hoisting upright post (4) and the fourth hoisting upright post (5) are symmetrically arranged between two hoisting upright posts, cantilever structural members (6) are respectively arranged on the first hoisting upright post (2) and the second hoisting upright post (3), a first mounting lifting lug (7) is arranged at the horizontal section of each cantilever structural member (6), and second mounting lifting lugs (8) are respectively arranged on the side surfaces of the third hoisting upright post (4) and the fourth hoisting upright post (5);

s1-2: a fixed truss (9) is erected outside the inner tower type FPSO single-point cabin (1), the fixed truss (9) comprises a support frame (10) and a cross beam (11) arranged on the support frame (10), and at least four third mounting lifting lugs (12) are arranged on the cross beam (11);

s1-3: a hoisting structure beam (13) is erected outside the inner rotating tower type FPSO single-point cabin (1), the height of the hoisting structure beam (13) is not less than that of the cross beam (11), a hoisting traction winch (14) is arranged on the hoisting structure beam (13), and the hoisting structure beam (13) is provided with a tubular lifting lug (15) which downwards corresponds to the inner rotating tower type FPSO single-point cabin (1);

s2: hoisting and displacing a hatch cover (1A);

s2-1: the hatch cover (1A) is provided with a left upper auxiliary lifting lug (16), a left lower auxiliary lifting lug (17), a right upper auxiliary lifting lug (18) and a right lower auxiliary lifting lug (19) on the surface, two first mounting lifting lugs (7) are respectively provided with a first electric hoist (7A), two second mounting lifting lugs (8) are respectively provided with a second electric hoist (8A), the two first electric hoists (7A) are correspondingly connected to the left upper auxiliary lifting lug (16) and the left lower auxiliary lifting lug (17) through steel wire lifting ropes, and the two second electric hoists (8A) are correspondingly connected to the right upper auxiliary lifting lug (18) and the right lower auxiliary lifting lug (19) through the steel wire lifting ropes;

s2-2: disassembling screws on the hatch cover (1A), starting a second electric hoist (8A) first, lifting one side of the hatch cover (1A), then starting a first electric hoist (7A), following the second electric hoist (8A), lifting the other side of the hatch cover (1A), stopping lifting when the hatch cover (1A) rises to a certain height, observing the lifting state of the hatch cover (1A), and executing the next step after confirming that each lifting point is stable and has no abnormity;

s2-3: the second electric hoist (8A) slowly lowers the steel wire lifting rope, the first electric hoist (7A) continues to pull the steel wire lifting rope, one side of the hatch cover (1A) slowly descends, the other side of the hatch cover (1A) is lifted until one side of the hatch cover (1A) moves and is attached to the edge of the opening of the inner rotating tower type FPSO single-point cabin (1), the first electric hoist (7A) and the second electric hoist (8A) are stopped, the steel wire lifting rope is tensioned by the first electric hoist (7A), the second electric hoist (8A) is in a rope loosening state, then a stop block (20) is installed at the edge of the opening of the inner rotating tower type FPSO single-point cabin (1), the stop block (20) is used for abutting against one side of the hatch cover (1A), and the opening of the inner rotating tower type FPSO single-point cabin (1) is completely opened;

s3: hoisting, disassembling and shifting the electric slip ring (1B);

s3-1: the hoisting lock (21) is installed at the top of the electric slip ring (1B), at least three first traction lifting lugs (22) are radially and symmetrically installed at the top of the electric slip ring (1B), a second traction lifting lug (23) and a third traction lifting lug (24) are installed on the side surface of the electric slip ring (1B), the second traction lifting lug (23) and the third traction lifting lug (24) are arranged in the vertical direction and are positioned on the same vertical line, a third electric hoist (15A) is installed on the tubular lifting lug (15), the third electric hoist (15A) is connected to the three first traction lifting lugs (22) through a steel wire lifting rope, and the hoisting traction winch (14) is connected to the hoisting lock (21) through a steel wire lifting rope;

s3-2: the connecting member of the electric slip ring (1B) is disassembled, the third electric hoist (15A) is started, the electric slip ring (1B) is lifted slowly and vertically, meanwhile, the anti-rotation guide chain at the bottom of the electric slip ring (1B) is controlled, the electric slip ring (1B) is separated from the installation base (1C) and is 0.1m away from the installation base (1C), the lifting is stopped, the lifting state of the electric slip ring (1B) is observed, and the next step is executed after the stability and the absence of abnormity of each lifting point are confirmed;

s3-3: the third electric hoist (15A) continues to vertically lift the electric slip ring (1B) until the distance between the electric slip ring (1B) and the mounting base (1C) is 1m, the lifting is stopped, and a plurality of temporary buttresses (25) are mounted on the mounting base (1C);

s3-4: after the temporary buttress (25) is installed, the third electric hoist (15A) slowly releases the electric slip ring (1B), a flange surface and a bolt hole at the bottom of the electric slip ring (1B) are aligned and contacted with the temporary buttress (25), the releasing is stopped, the temporary buttress (25) and the electric slip ring (1B) are fixed together through screws, and then an operator shears an internal cable of the electric slip ring (1B) from a gap space of the temporary buttress (25);

s3-5: after the internal cable of the electric slip ring (1B) is cut, screws between the temporary buttress (25) and the electric slip ring (1B) are disassembled, the third electric hoist (15A) vertically lifts the electric slip ring (1B) to lift the electric slip ring (1B) to a distance of 1.5m away from the temporary buttress (25), the hoisting and traction winch (14) tensions a steel wire lifting rope, and the hoisting and traction winch (14) and the third electric hoist (15A) are both in a load-bearing state at the moment;

s3-6: the third electric hoist (15A) slowly and vertically discharges the electric slip ring (1B) to enable the hoisting and traction winch (14) to continuously tension the steel wire lifting rope, so that complete stress is gradually achieved, and after the third electric hoist (15A) and the hoisting and traction winch (14) complete relay handover in the vertical direction, the third electric hoist (15A) keeps an emergency standby state and synchronously acts with the hoisting and traction winch (14) but does not bear load;

s3-7: when the hoisting and traction winch (14) slowly lifts the electric slip ring (1B), the four third mounting lifting lugs (12) are correspondingly provided with a fourth electric hoist (12A), a fifth electric hoist (12B), a sixth electric hoist (12C) and a seventh electric hoist (12D), and the fourth electric hoist (12A), the fifth electric hoist (12B), the sixth electric hoist (12C) and the seventh electric hoist (12D) are sequentially arranged from near to far according to the distance between the hoisting and traction winch and the electric slip ring (1B);

s3-8: when a second traction lifting lug (23) on the electric slip ring (1B) is lifted to the position above the opening of the inner tower type FPSO single-point cabin (1), a fourth electric hoist (12A) and a fifth electric hoist (12B) are connected to the second traction lifting lug (23) through steel wire lifting ropes, when a third traction lifting lug (24) on the electric slip ring (1B) is lifted to the position above the opening of the inner tower type FPSO single-point cabin (1), a sixth electric hoist (12C) and a seventh electric hoist (12D) are connected to the third traction lifting lug (24) through the steel wire lifting ropes, at the moment, a hoisting traction winch (14) stops lifting the electric slip ring (1B), and the fourth electric hoist (12A) and the fifth electric hoist (12B) tension the steel wire lifting ropes;

s3-9: the sixth electric hoist (12C) slowly retracts the steel wire lifting rope, so that the electric slip ring (1B) starts to turn right, and meanwhile, the fourth electric hoist (12A) retracts the steel wire lifting rope, so that the integral right translation amount of the electric slip ring (1B) is reduced, and at the moment, the electric slip ring (1B) is in a 15-degree inclined state relative to the horizontal plane;

s3-10: a fourth electric hoist (12A) and a sixth electric hoist (12C) continue to slowly retract and pull the steel wire lifting rope, when the fourth electric hoist (12A) reaches the shortest rope retracting limit, the electric slip ring (1B) is in a 30-degree inclined state relative to the horizontal plane, the hoisting traction winch (14) lowers the steel wire lifting rope, and the lowering distance is controlled by taking the fourth electric hoist (12A) to continue to bear force and taking the electric slip ring (1B) not to contact with the opening of the inner tower type FPSO single-point cabin (1) as a reference;

s3-11: a fourth electric hoist (12A) and a sixth electric hoist (12C) continue to slowly retract and pull the steel wire lifting rope, when the fourth electric hoist (12A) reaches the shortest rope retracting limit, a hoisting and traction winch (14) is lifted to lower the steel wire lifting rope, the lowering distance is controlled by taking the fourth electric hoist (12A) as the reference to continue bearing force, and the electric slip ring (1B) is not contacted with the mouth of the inner tower type FPSO single-point cabin (1), and when the electric slip ring (1B) is in a 45-degree inclined state relative to the horizontal plane, the bottom of the electric slip ring (1B) approaches to be moved out of the mouth of the inner tower type FPSO single-point cabin (1);

s3-12: a fourth electric hoist (12A) and a sixth electric hoist (12C) continue to slowly draw the steel wire lifting rope, when the fourth electric hoist (12A) reaches the shortest rope drawing limit, a hoisting traction winch (14) is used for lowering the steel wire lifting rope, the lowering distance is controlled by taking the fourth electric hoist (12A) to continue bearing force and taking the electric slip ring (1B) not to contact with the mouth of the inner rotating tower type FPSO single-point cabin (1) as a reference, and when the electric slip ring (1B) is in an inclined state of 60 degrees relative to the horizontal plane, the bottom of the electric slip ring (1B) is moved out of the mouth of the inner rotating tower type FPSO single-point cabin (1);

s3-13: after the bottom of the electric slip ring (1B) leaves an opening of the inner turret type FPSO single-point cabin (1), slowly retracting and pulling the steel wire lifting rope by the fifth electric hoist (12B) and the seventh electric hoist (12D), simultaneously lowering the steel wire lifting rope by the hoisting and traction winch (14), the fourth electric hoist (12A) and the sixth electric hoist (12C), transferring the hoisting of the electric slip ring (1B) from the fourth electric hoist (12A) and the sixth electric hoist (12C) to the fifth electric hoist (12B) and the seventh electric hoist (12D), hoisting and traction the winch (14) to unload force, and keeping the electric slip ring (1B) away from the opening of the inner turret type FPSO single-point cabin (1);

s3-14: when the electric slip ring (1B) is completely supported by the fifth electric hoist (12B) and the seventh electric hoist (12D), the hoisting and traction winch (14), the fourth electric hoist (12A) and the sixth electric hoist (12C) are all unloaded, and the electric slip ring (1B) completely leaves the opening of the inner tower type FPSO single-point cabin (1);

s3-15: placing a moving trolley (26) below the electric slip ring (1B), simultaneously placing steel wire lifting ropes on a fifth electric hoist (12B) and a seventh electric hoist (12D), placing the electric slip ring (1B) on the moving trolley (26), tightening and fixing by using binding bands, and finally untying all the steel wire lifting ropes;

s4: the transfer trolley (26) firstly transports the electric slip ring (1B) to a ship loading and hoisting area of the FPSO, a crane of the FPSO is used for hoisting and fixing the electric slip ring (1B) to a ship loading and fixing frame of a transport ship, and after the transport ship is transferred and leaned on the shore, the electric slip ring (1B) is hoisted to a land transport frame and then transported to an engineering maintenance point;

s5: after the electric slip ring (1B) is repaired at an engineering repair site, the electric slip ring is transported back to the inner tower type FPSO single-point cabin (1), the electric slip ring (1B) and the hatch cover (1A) are installed again, and the installation sequence and the disassembly sequence of the hatch cover (1A) and the electric slip ring (1B) are opposite.

2. The method capable of realizing offshore replacement of the internal turret type FPSO single-point electrical slip ring according to claim 1, wherein the method comprises the following steps: in the S2-3, a fixing lifting lug (27) is arranged on the inner side surface of the hatch cover (1A), and the fixing lifting lug (27) is fixed on a deck upright post (29) of the FPSO through a chain block (28).

3. The method capable of realizing offshore replacement of the internal turret type FPSO single-point electric slip ring according to claim 2, wherein the method comprises the following steps: in the S2-3, the stop block (20) is fixed on the edge of the opening of the inner turret type FPSO single-point cabin (1) through screws.

4. The method capable of realizing offshore replacement of the internal turret type FPSO single-point electrical slip ring according to claim 3, wherein the method comprises the following steps: in the S1-2, the bottom of the cross beam (11) is provided with a guide rail groove structure, and the third mounting lug (12) is slidably arranged on the cross beam (11).

5. The method capable of realizing offshore replacement of the internal turret type FPSO single-point electric slip ring according to claim 4, wherein the method comprises the following steps: in the step S1-3, the hoisting structure beam (13) is further provided with a guide pulley (30), and in the step S3-1, a steel wire lifting rope of the hoisting traction winch (14) is connected to a hoisting lock (21) through the guide pulley (30).

6. The method capable of realizing offshore replacement of the internal turret type FPSO single-point electrical slip ring according to claim 5, wherein the method comprises the following steps: in S3-15, a groove rib plate (31) matched with the electric slip ring (1B) is arranged on the surface of the moving trolley (26).