Module structure and load determination method of cargo oil unloading station of FPSO conversion ship

Abstract

The present invention discloses a modular structure of a cargo oil unloading station of a FPSO converted ship, including an upper platform, a top platform, an intermediate platform, a platform, an upper column, a lower column, an upper oblique support, a lower oblique support, a first main pulley, a main lifting lug, a main lifting shackle, an auxiliary oil unloading lug, an auxiliary oil unloading shackle, an auxiliary oil unloading hand winch, an auxiliary oil unloading wire rope, a main lifting wire rope, a valve lifting lug, a valve lifting shackle, a valve lifting wire rope and a second main pulley. The modular structure and load determination method of the cargo oil unloading station of the FPSO converted ship of the present invention meet the demand of the equipment for external transportation of cargo oil during the daily operation of the FPSO converted ship under the premise of ensuring the structural strength, innovate the design and optimize the structural form, effectively connect with the hull structure to form a whole, which is conducive to the effective transmission of its load to the main hull structure and avoids damage to the fatigue strength of the module structure.

Description

Technical Field

[0001] The invention relates to a cargo oil unloading station module structure of a FPSO converted ship and a load determination method. Background Art

[0002] At present, in the construction process of FPSO conversion ships, the stern oil unloading system is one of the important systems of FPSO. The oil unloading system transports the finished oil and gas in the main hull cabin to the shuttle tanker through a floating hose. The oil unloading system includes cargo oil pipes, winches, guide rollers, unloading station modules and floating hoses. In order to save the rear deck area, reduce the cost of the oil unloading station and reduce maintenance costs, a modular design of the oil unloading station is adopted and it is installed on the side of the hull outer plate. Summary of the invention

[0003] The object of the present invention is to provide a cargo oil unloading station module structure for a FPSO conversion ship which has a simple structure, reasonable layout, convenient operation, low maintenance cost, and strength and buckling that meet the requirements of specifications and relevant standards.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a modular structure of a cargo oil unloading station for a converted FPSO ship, comprising an upper platform (1), a top platform (2), an intermediate platform (3), a first platform (4), an upper column (5), a lower column (6), an upper oblique support (7), a lower oblique support (8), a first main pulley (11), a main lifting lug (12), a main lifting shackle (13), an auxiliary oil unloading lug (14), an auxiliary oil unloading shackle (15), an auxiliary oil unloading hand winch (16), an auxiliary oil unloading wire rope (17), a main lifting wire rope (21), a valve lifting lug (28), a valve lifting shackle (29), a valve lifting wire rope (30) and a second main pulley (31), wherein the module upper platform (1), the top platform (2), an intermediate platform (3), a first platform (4), an upper column (5), a lower column (6), an upper oblique support (7) and a lower oblique support (8) form a truss structure; the first main pulley (11), a main lifting eye (12), a main lifting shackle (13), a main lifting wire rope (21) and a second main pulley (31) form a main lifting system suspended on the top platform (2); the auxiliary oil unloading eye (14), an auxiliary oil unloading shackle (15), an auxiliary oil unloading hand winch (16) and an auxiliary oil unloading wire rope (17) form an auxiliary lifting system suspended on the upper oblique support (7); the valve lifting eye (28), a valve lifting shackle (29) and a valve lifting wire rope (30) form a valve maintenance device installed on the upper platform (1).

[0005] The top platform (2) is also provided with a movable railing (9), a fixed railing (10) and a straight ladder (27).

[0006] The intermediate platform (3) is also provided with an elbow pipe support (19), a grid (25) and a valve oil collecting pan (26).

[0007] The platform (4) is also provided with an oil unloading port stop point structural support (18), an oil unloading port baffle (20), a floating hose lifting lug (22), a floating hose lifting shackle (23) and a movable foldable door (24).

[0008] The main lifting shackle (13) and the auxiliary oil unloading shackle (15) are composed of two sets of shackles, which are cross-installed at 90 degrees so that the pulling force direction and the force direction of the heavy object are in the same plane.

[0009] The oil unloading port stop point structural support (18) consists of a cargo oil pipe pad, a horizontal pipe support, an inclined pipe support and a main structure inclined support, wherein the horizontal pipe support and the inclined pipe support are directly connected to the cargo oil pipe pad.

[0010] The oil unloading port baffle (20) is in a bell-mouth shape, and a semicircular steel reinforcing rib is fixed on the oil unloading port baffle (20).

[0011] The movable foldable door (24) is a detachable and lockable movable foldable door (24).

[0012] Another technical solution adopted by the present invention to achieve the above-mentioned purpose is: a method for determining the structural load of a cargo oil unloading station module of a FPSO conversion ship, comprising the following steps:

[0013] A. Determine the load of the steel wire rope on one side of the first main pulley (11) and the second main pulley (31) according to the maximum draft height during oil unloading, that is, the maximum height above the sea surface to which the main lifting lug (12) needs to lift the floating hose (33) in the oil delivery state, and the actual number of floating hoses (33) on the sea surface;

[0014] B. The actual weight of a single floating hose (33) is obtained through sampling, and the influence of wind, waves and current is considered, and a safety factor of 1.5 is added to select the safe load of the first main pulley (11) and the second main pulley (31);

[0015] C. The safe load of the main lifting eye (12) is determined as twice the safe load of the main pulley;

[0016] D. The safety load of the main lifting shackle (13) is equal to the safety load of the main lifting eye (12);

[0017] E. The main lifting eye (12) lifts the floating hose (33) to the bottom of the oil unloading port, and then two sets of auxiliary oil unloading eyes (14), auxiliary oil unloading shackles (15), auxiliary oil unloading hand winches (16) and auxiliary oil unloading wire ropes (17) move it to the bottom of the oil unloading port and then connect it to the flange. The safety load of the auxiliary oil unloading eyes (14), auxiliary oil unloading shackles (15), auxiliary oil unloading hand winches (16) and auxiliary oil unloading wire ropes (17) is half of the safety load of the main lifting eye (12);

[0018] F. Based on the stress of the fluid on the pipe wall during oil unloading, the stress of the temperature change on the pipe wall, and the maximum weight of the floating hose (33) suspended on the sea surface during oil unloading, the support reaction force and bending moment values ​​in various directions are obtained through pipeline stress analysis software, thereby determining the support reaction force and bending moment load of the oil unloading port stop point structure (18) and the cargo oil pipe elbow pipe support (19).

[0019] The present invention provides a module structure of a cargo oil unloading station of a converted FPSO ship and a load determination method. Under the premise of ensuring the structural strength, the demand for cargo oil external transportation of equipment during the daily operation of the converted FPSO ship is met. The structural form is innovatively designed and optimized, and is effectively connected with the hull structure to form a whole, which is beneficial for the effective transmission of its load to the main dock structure and avoids damage to the fatigue strength of the module structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of a modular structure of a cargo oil unloading station of a converted FPSO ship according to the present invention.

[0021] Figure 2 It is a side view of a modular structure of a cargo oil unloading station of a converted FPSO ship according to the present invention.

[0022] Figure 3 It is a schematic diagram of a top platform of a modular structure of a cargo oil unloading station of a converted FPSO ship according to the present invention.

[0023] Figure 4 It is a schematic diagram of an intermediate platform of a modular structure of a cargo oil unloading station of a converted FPSO ship according to the present invention.

[0024] Figure 5 It is a platform schematic diagram of a modular structure of a cargo oil unloading station of a converted FPSO ship according to the present invention.

[0025] In the figure: 1. upper platform; 2. top platform; 3. middle platform; 4. first platform; 5. upper column; 6. lower column; 7. upper oblique support; 8. lower oblique support; 9. movable railing; 10. fixed railing; 11. first main pulley; 12. main lifting eye; 13. main lifting shackle; 14. auxiliary oil unloading eye; 15. auxiliary oil unloading shackle; 16. auxiliary oil unloading hand hoist; 17. auxiliary oil unloading wire rope; 18. Structural support for the stop point of the oil unloading port; 19. Elbow pipe bracket; 20. Oil unloading port baffle; 21. Main lifting wire rope; 22. Floating hose lifting lug; 23. Floating hose lifting shackle; 24. Movable foldable door; 25. Grille; 26. Valve oil collecting tray; 27. Straight ladder; 28. Valve lifting lug; 29. ​​Valve lifting shackle; 30. Valve lifting wire rope; 31. Second main pulley; 32. Sinking deck; 33. Floating hose. DETAILED DESCRIPTION

[0026] like Figures 1 to 5As shown, the modular structure of the cargo oil unloading station of the FPSO conversion ship includes an upper platform 1, a top platform 2, an intermediate platform 3, a first platform 4, an upper column 5, a lower column 6, an upper oblique support 7, a lower oblique support 8, a first main pulley 11, a main lifting eye 12, a main lifting shackle 13, an auxiliary oil unloading eye 14, an auxiliary oil unloading shackle 15, an auxiliary oil unloading hand winch 16, an auxiliary oil unloading wire rope 17, a main lifting wire rope 21, a valve lifting eye 28, a valve lifting shackle 29, a valve lifting wire rope 30 and a second main pulley 31. The upper platform 1, the top platform 2, the middle platform 3, the first platform 4, the upper column 5, the lower column 6, the upper oblique support 7 and the lower oblique support 8 of the module form a truss structure. The first main pulley 11, the main lifting lug 12, the main lifting shackle 13, the main lifting wire rope 21 and the second main pulley 31 form a main lifting system suspended on the top platform 2. The auxiliary oil unloading lug 14, the auxiliary oil unloading shackle 15, the auxiliary oil unloading hand winch 16 and the auxiliary oil unloading wire rope 17 form an auxiliary lifting system suspended on the upper oblique support 7. The valve lifting lug 28, The valve maintenance device composed of the valve lifting shackle 29 and the valve lifting wire rope 30 is installed on the upper platform 1. The top platform 2 is also provided with a movable railing 9, a fixed railing 10 and a straight ladder 27. The middle platform 3 is also provided with an elbow pipe bracket 19, a grille 25 and a valve oil collecting tray 26. The first platform 4 is also provided with an oil unloading port stop point structure support 18, an oil unloading port baffle 20, a floating hose lifting lug 22, a floating hose lifting shackle 23 and a movable foldable door 24. The main lifting shackle 13 and the auxiliary oil unloading shackle 15 are composed of two sets of shackles. The oil unloading port baffle 20 is formed by a 90° cross installation, so that the pulling direction and the force direction of the heavy object are in the same plane. The oil unloading port stop point structure support 18 is composed of a cargo oil pipe pad, a horizontal pipe support, an inclined pipe support and a main structure inclined support. The horizontal pipe support and the inclined pipe support are directly connected to the cargo oil pipe pad. The oil unloading port baffle 20 adopts a trumpet shape, and a semicircular steel reinforcement rib is fixed on the oil unloading port baffle 20. The movable foldable door 24 is a detachable locking movable foldable door 24. The cargo oil unloading station module structure is installed on the stern sinking deck 32 of the ship and the outer plate of the hull.

[0027] The module structure load determination method of the cargo oil unloading station of the FPSO conversion ship includes the safe load determination of the lifting lug, pulley, shackle, hand winch, wire rope and the elbow pipe bracket, the structural support reaction force and bending moment load of the oil unloading port stop point. The specific steps are as follows: A. Determine the load of the wire rope on one side of the first main pulley 11 and the second main pulley 31, which depends on the maximum draft height when the oil is to be unloaded, that is, in the oil delivery state, the maximum height of the floating hose 33 above the sea surface that the main lifting lug 12 needs to lift, that is, the actual root height of the floating hose 33 on the sea surface. B. The actual weight of a single floating hose is then obtained through the sample. Considering the influence of wind, waves and current, a safety factor of 1.5 is added. This value is used to select the safety load of the first main pulley 11 and the second main pulley 31. C. The safety load of the main lifting lug 12 is designed to be twice the safety load of the main pulley. D. The safety load of the main lifting shackle 13 is equal to the safety load of the main lifting lug 12. E. The main lifting lug 12 lifts the floating hose 33 to the bottom of the oil unloading port, and then the two sets of auxiliary oil unloading lugs 14, auxiliary oil unloading shackles 15 and auxiliary oil unloading shackles 16 are used to lift the floating hose 33 to the bottom of the oil unloading port. The auxiliary unloading hand chain hoist 16 and the auxiliary unloading wire rope 17 are moved to the right below the unloading port and then connected to the flange. Therefore, the safety load of the auxiliary unloading lifting lug 14, the auxiliary unloading shackle 15, the auxiliary unloading hand chain hoist 16 and the auxiliary unloading wire rope 17 is half of the safety load of the main lifting lifting lug 12; F, the unloading port stop point structure 18 and the cargo oil pipe elbow pipe bracket 19 support the reaction force and bending moment load determination, and it is necessary to consider the stress of the fluid on the pipe wall during unloading, the stress of the temperature change on the pipe wall, and the maximum weight of the floating hose 33 suspended on the sea surface during unloading. The support reaction force and bending moment values ​​in all directions are obtained through pipeline stress analysis software; structural strength analysis method of the oil unloading port stop point: first, calculate the actual structural elastic coefficient, because the structure satisfies Hooke's law F=KX within the elastic range, and extract the displacement of the pipe center in three directions at the oil unloading port stop point in accordance with different stresses in the structural strength analysis software FEMAP, respectively, and calculate the K value that satisfies the corresponding different stress structures in the elastic range, and then calculate the average value, which is the actual structural elastic coefficient; secondly, input the actual structural elastic coefficient in the pipeline stress analysis software CAESAR II to obtain the support reaction force and bending moment of the actual working condition; finally, input the support reaction force and bending moment of the actual working condition in the structural strength analysis software FEMAP to obtain the actual stress value and strain value of the structure, and compare it with the allowable stress value specified in the specification to see whether it meets the requirements of the specification.

Claims

1. A modular structure of a cargo oil unloading station for a converted FPSO ship, characterized in that: The utility model comprises an upper platform (1), a top platform (2), an intermediate platform (3), a first platform (4), an upper column (5), a lower column (6), an upper oblique support (7), a lower oblique support (8), a first main pulley (11), a main lifting eye (12), a main lifting shackle (13), an auxiliary oil unloading eye (14), an auxiliary oil unloading shackle (15), an auxiliary oil unloading hand chain hoist (16), an auxiliary oil unloading wire rope (17), a main lifting wire rope (21), a valve lifting eye (28), a valve lifting shackle (29), a valve lifting wire rope (30) and a second main pulley (31), wherein the utility model is The upper platform (1), the top platform (2), the middle platform (3), the first platform (4), the upper columns (5), the lower columns (6), the upper oblique supports (7) and the lower oblique supports (8) form a truss structure. The upper platform (1) is installed on the top platform (2). The top platform (2) is connected to the middle platform (3) through the upper columns (5) and the upper oblique supports (7). The middle platform (3) is connected to the first platform (4) through the lower columns (6) and the lower oblique supports (8). The first main pulley (11), the main lifting lug (12), the main lifting shackle (13), and the main lifting wire rope The auxiliary lifting system is suspended on the top platform (2) by means of the auxiliary lifting lug (14), the auxiliary lifting lug (15), the auxiliary lifting hand winch (16), and the auxiliary lifting wire rope (17). The auxiliary oil unloading lug (14) is hung on the upper inclined support (7), the auxiliary oil unloading wire rope (17) is connected to the auxiliary oil unloading lug (14) through the auxiliary oil unloading hand winch (16) and the auxiliary oil unloading shackle (15), the valve lifting lug (28), the valve lifting shackle (29) and the valve lifting wire rope (30) constitute a valve maintenance device installed on the upper platform (1), the valve lifting lug (28) is installed on the upper platform (1), and the valve lifting wire rope (30) is connected to the valve lifting lug (28) through the valve lifting shackle (29).

2. The modular structure of a cargo oil unloading station for a converted FPSO vessel according to claim 1, characterized in that: The top platform (2) is also provided with a movable railing (9), a fixed railing (10) and a straight ladder (27).

3. The modular structure of the cargo oil unloading station of a converted FPSO ship according to claim 1, characterized in that: The intermediate platform (3) is also provided with an elbow pipe support (19), a grid (25) and a valve oil collecting pan (26).

4. The modular structure of the cargo oil unloading station of a converted FPSO ship according to claim 1, characterized in that: The platform (4) is also provided with an oil unloading port stop point structural support (18), an oil unloading port baffle (20), a floating hose lifting lug (22), a floating hose lifting shackle (23) and a movable foldable door (24).

5. The modular structure of the cargo oil unloading station of a converted FPSO ship according to claim 1, characterized in that: The main lifting shackle (13) and the auxiliary oil unloading shackle (15) are composed of two sets of shackles, which are cross-installed at 90 degrees so that the pulling force direction and the force direction of the heavy object are in the same plane.

6. The modular structure of the cargo oil unloading station of a converted FPSO ship according to claim 4, characterized in that: The oil unloading port stop point structural support (18) consists of a cargo oil pipe pad, a horizontal pipe support, an inclined pipe support and a main structure inclined support, wherein the horizontal pipe support and the inclined pipe support are directly connected to the cargo oil pipe pad.

7. The modular structure of the cargo oil unloading station of a converted FPSO ship according to claim 4, characterized in that: The oil unloading port baffle (20) is in a bell-mouth shape, and a semicircular steel reinforcement rib is fixed on the oil unloading port baffle (20).

8. The modular structure of the cargo oil unloading station of a converted FPSO ship according to claim 4, characterized in that: The movable foldable door (24) is a detachable and lockable movable foldable door (24).

9. A method for determining the structural load of a cargo oil unloading station module of a FPSO conversion ship according to claim 1, characterized in that: The following steps are involved: A. Determine the load of the steel wire rope on one side of the first main pulley (11) and the second main pulley (31) according to the maximum draft height during oil unloading, that is, the maximum height above the sea surface to which the main lifting lug (12) needs to lift the floating hose (33) in the oil delivery state, and the actual number of floating hoses (33) on the sea surface; B. The actual weight of a single floating hose (33) is obtained through sampling, and the influence of wind, waves and current is considered, and a safety factor of 1.5 is added to select the safe load of the first main pulley (11) and the second main pulley (31); C. The safe load of the main lifting eye (12) is determined as twice the safe load of the main pulley; D. The safety load of the main lifting shackle (13) is equal to the safety load of the main lifting eye (12); E. The main lifting eye (12) lifts the floating hose (33) to the bottom of the oil unloading port, and then two sets of auxiliary oil unloading eyes (14), auxiliary oil unloading shackles (15), auxiliary oil unloading hand winches (16) and auxiliary oil unloading wire ropes (17) move it to the bottom of the oil unloading port and then connect it to the flange. The safety load of the auxiliary oil unloading eyes (14), auxiliary oil unloading shackles (15), auxiliary oil unloading hand winches (16) and auxiliary oil unloading wire ropes (17) is half of the safety load of the main lifting eye (12); F. Based on the stress of the fluid on the pipe wall during oil unloading, the stress of the temperature change on the pipe wall, and the maximum weight of the floating hose (33) suspended on the sea surface during oil unloading, the support reaction force and bending moment values ​​in each direction are obtained through pipeline stress analysis software, thereby determining the support reaction force and bending moment load of the unloading port stop point structure support (18) and the cargo oil pipe elbow pipe support (19).

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