Design method for hydraulic locking device of FPSO single-point mooring system

Abstract

The invention relates to a single-point mooring system, in particular to a design method of a hydraulic locking device of an FPSO single-point mooring system, which comprises the following steps: S1, mounting a guide frame assembly; s2, the sliding shoe assembly is installed in the guide frame assembly; s3, the supporting assembly is assembled; s4, the fixing assembly is installed on the supporting assembly; s5, the locking assembly is installed between the guide frame assembly and the supporting assembly; s6, the supporting assembly is positioned and installed on the deck; s7, tie-back of the buoy from the mouth of the moon pool; s8, releasing the buoy from the mouth of the moon pool; the device has high efficiency, flexibility, stability, safety, strong adaptability, durability, reliability, safety and maintainability, is optimized in structure and easy to operate, and provides an efficient, stable and safe solution for mooring operation in ocean engineering.

Description

Technical Field

[0001] The present invention relates to a single point mooring system, in particular to a design method of a hydraulic locking device for an FPSO single point mooring system. Background Art

[0002] The use of FPSOs (Floating Production Storage and Offloading) for oil and gas development is a key model for offshore oilfield development in my country. After decades of development, significant progress has been made in FPSO hull design, topside module design, FPSO construction and commissioning, offshore installation, and general contracting management. Among FPSO mooring systems, single-point mooring offers advantages such as wide applicability in water depths, mature and reliable technology, strong wind and wave resistance, and ease of maintenance. It has become the preferred mooring solution for newly built and retrofitted FPSOs in recent years. In buoy-type internal turret single-point mooring systems, the locking mechanism plays a crucial role in the FPSO's release and tie-back process.

[0003] The turret area of an FPSO vessel's hull features a moonpool opening. A tapered buoy enters the moonpool opening and is connected to the offshore floating platform via a locking device. For example, Chinese invention patent publication number CN111452913B, entitled "A Single-Point Mooring Claw Locking Device," utilizes both a hydraulic cylinder and a mechanical locking mechanism. The locking mechanism requires coordination between articulated joints during release and reconnection, resulting in a complex structure. The hydraulic cylinder remains under pressure for extended periods, making it susceptible to failure and hindering reconnection. Summary of the Invention

[0004] The main purpose of the present invention is to provide a design method for a hydraulic locking device of an FPSO single point mooring system, so as to solve the problems raised in the related art.

[0005] To achieve the above object, according to one aspect of the present invention, a method for designing a hydraulic locking device for a FPSO single point mooring system is provided, comprising the following steps:

[0006] S1: Install the guide frame assembly;

[0007] S2: Install the sliding shoe assembly into the guide frame assembly;

[0008] S3: Assemble support components;

[0009] S4: Install the fixing assembly on the supporting assembly;

[0010] S5: Install the locking assembly between the guide frame assembly and the support assembly;

[0011] S6: Position and install the support assembly on the deck;

[0012] S7: The buoy is connected back from the moon pool mouth;

[0013] S8: The buoy is released from the moon pool mouth.

[0014] Furthermore, the guide frame assembly has several sets, all of which are arranged around the moon pool mouth. The guide frame assembly includes a cover plate, two side support frames and two self-lubricating plates. The two side support frames are relatively fixed at the bottom of the cover plate, and a guide channel is formed between the two side support frames. The two self-lubricating plates are respectively fixed on the opposite sides of the two side support frames.

[0015] Furthermore, the sliding shoe assembly is arranged in the guide channel, and the sliding shoe assembly includes a support hinge, two baffles, a sliding shoe pad and a slide plate. The support hinge is semi-cylindrical, and both ends of the support hinge are fixedly connected with baffles. The sliding shoe pad is fixed to the bottom surface of the support hinge, and the slide plate is fixed on the hull deck, and the sliding shoe pad is slidably arranged on the upper surface of the slide plate.

[0016] Furthermore, the support assembly includes two L-shaped support frames and a plurality of connecting plates. The two support frames are arranged in parallel and fixedly connected in the middle by a plurality of connecting plates.

[0017] Furthermore, a first pin is fixedly provided in the middle of the top of the vertical section of the two L-shaped support frames, a hydraulic cylinder is provided on the first pin, the hydraulic cylinder is hinged to the first pin, and a second pin is fixedly provided at the end of the telescopic rod of the hydraulic cylinder.

[0018] Furthermore, a guide mechanism is provided between the horizontal sections of the two L-shaped support frames, and the guide mechanism includes a guide seat and a guide column, and the guide column is located above the guide seat.

[0019] Furthermore, the guide column includes a steel pipe, a stud and two guide column nuts. The two ends of the stud are respectively passed through two support frames and fixed to the support frames through the guide column nuts. The steel pipe is rotatably sleeved on the outer ring of the stud.

[0020] Furthermore, the locking assembly includes a locking arm, a plurality of wear-resistant plates are fixedly provided on both sides of the locking arm, and a locking end and a connecting end are respectively provided at both ends of the locking arm.

[0021] Furthermore, the locking end includes a locking arm pad, a bearing and a bearing groove, the connecting end includes a self-lubricating sleeve and a mating groove, the locking arm pad is fixedly arranged on the top surface of the locking arm, the bearing groove is arranged on the bottom surface of the locking arm, the bearing is located in the bearing groove and is fixedly connected to the locking arm, the mating groove is arranged on the top surface of the locking arm, and the self-lubricating sleeve is arranged through the end of the locking arm.

[0022] Furthermore, the fixing assembly includes a locking screw protective cap, a locking screw, a locking cap and a locking nut. The locking screw is rotatably arranged at the bottom of the locking nut, the locking cap is fixed at the bottom of the locking screw, and a locking screw protective cap is sleeved on the locking nut.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. Efficiency and flexibility: Through the extension and retraction of the hydraulic cylinder, the locking arm and the buoy can be connected and separated quickly and flexibly, thereby improving work efficiency and making operation more convenient.

[0025] 2. Stability and safety: The design of the guide frame assembly and guide mechanism ensures the stability and accuracy of the locking arm during the sliding process, avoiding safety hazards caused by shaking or deviation; at the same time, the setting of the fixed component further enhances the stability of the device in the locked state.

[0026] 3. Adaptability: The design of the sliding shoe assembly allows the locking assembly to slide back and forth in the guide frame assembly, which is suitable for buoys of different sizes and shapes, enhancing the versatility and adaptability of the device.

[0027] 4. Durability and reliability: The use of key components with specific shapes, such as locking arms and guide columns, ensures the durability and reliability of the device, enabling it to operate stably for a long time in harsh marine environments.

[0028] 5. Safety and maintainability: The design of the locking nut and locking screw makes it easy to fix the position of the locking arm in the locked state, thereby improving safety. At the same time, the structural design of this device also takes maintainability into consideration, and countersunk bolts are used to connect the components, which facilitates daily maintenance and overhaul.

[0029] 6. Structural optimization: The design of the variable diameter arm increases the strength of the locking arm, improves the locking effect and service life; in addition, the guide column adopts a combination of studs and steel pipes, which not only ensures the guidance accuracy but also reduces the cost.

[0030] 7. Easy to operate: The locking arm can be fixed by rotating the locking screw. The operation is simple and convenient, reducing the labor intensity of the operator.

[0031] In summary, the design of this device provides an efficient, stable and safe solution for mooring operations in marine engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the layout of the hydraulic locking device and moon pool port for the design method of the hydraulic locking device of the FPSO single point mooring system of the present invention;

[0033] Figure 2 This is an overall schematic diagram of the design method of the hydraulic locking device of the FPSO single-point mooring system of the present invention;

[0034] Figure 3 A cross-sectional view of a tie-back locking state of a design method for a hydraulic locking device for a FPSO single-point mooring system according to the present invention;

[0035] Figure 4 A cross-sectional view of a release state of a design method for a hydraulic locking device of a FPSO single-point mooring system according to the present invention;

[0036] Figure 5 A schematic diagram of the three-dimensional structure of the support assembly of the design method of the hydraulic locking device of the FPSO single-point mooring system of the present invention;

[0037] Figure 6 A schematic diagram of the three-dimensional structure of a locking assembly according to a design method of a hydraulic locking device for a FPSO single-point mooring system of the present invention;

[0038] Figure 7 A schematic diagram of the three-dimensional structure of the sliding shoe assembly of the design method of the hydraulic locking device of the FPSO single-point mooring system of the present invention;

[0039] Figure 8 A schematic diagram of the three-dimensional structure of the fixing assembly of the design method of the hydraulic locking device of the FPSO single-point mooring system of the present invention;

[0040] Figure 9 A schematic diagram of the internal structure of a fixing assembly of a design method for a hydraulic locking device for a FPSO single-point mooring system according to the present invention;

[0041] Figure 10 A schematic diagram of the three-dimensional structure of a guide seat in a design method of a hydraulic locking device for a FPSO single-point mooring system according to the present invention;

[0042] Figure 11 A schematic diagram of the three-dimensional structure of a guide column in a design method of a hydraulic locking device for a FPSO single-point mooring system according to the present invention;

[0043] Figure 12 This is a schematic diagram of the three-dimensional structure of the guide frame assembly of the design method of the hydraulic locking device of the FPSO single-point mooring system of the present invention.

[0044] Reference numerals:

[0045] 1. Guide frame assembly; 11. Cover plate; 12. Side support frame; 13. Self-lubricating plate;

[0046] 2. Support assembly; 21. First pin; 22. Hydraulic cylinder; 23. Second pin; 24. Guide seat; 25. Guide column; 26. Steel pipe; 27. Stud; 28. Guide column nut; 29. Guide mechanism; 210. Support frame; 211. Connecting plate;

[0047] 3. Locking assembly; 31. Locking arm pad; 32. Locking arm; 33. Bearing; 34. Wear plate; 35. Self-lubricating sleeve; 36. Matching groove; 37. Bearing groove; 38. Locking end; 39. Connecting end;

[0048] 4. Slide shoe assembly; 41. Support hinge; 42. Baffle; 43. Slide shoe pad; 44. Slide plate;

[0049] 5. Fixing assembly; 51. Locking screw protective cap; 52. Locking screw; 53. Locking cap; 54. Locking nut;

[0050] 6. Moon Pond Mouth; 61. Buoy. DETAILED DESCRIPTION

[0051] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0052] This embodiment provides a design method for a hydraulic locking device of an FPSO single-point mooring system, comprising the following steps:

[0053] S1: Install guide frame assembly 1;

[0054] The two side support frames 12 and the cover plate 11 are fixed with bolts, and the self-lubricating plate 13 is installed on the inner side of the side support frame 12 with countersunk screws. The self-lubricating plate 13 is made of polytetrafluoroethylene, polyoxymethylene, ultra-high molecular weight polyethylene or graphite composite materials with low friction coefficient; the surface is precisely polished to reduce the surface roughness, or coated with a low-friction coating to reduce the friction coefficient, thereby reducing the wear of the side support frame 12.

[0055] S2: Install the sliding shoe assembly 4 into the guide frame assembly 1;

[0056] Fix the baffle 42 on both sides of the support hinge 41, fix the sliding shoe pad 43 to the bottom surface of the support hinge 41, and fix the slide plate 44 on the ship deck at the guide channel. Place the assembled support hinge 41 on the slide plate 44 so that the support hinge 41 can slide back and forth along the slide plate 44.

[0057] S3: Assemble support assembly 2;

[0058] The support frames 210 on both sides are welded together through the connecting plate 211, and the hydraulic cylinder 22 is hinged to the upper side of the connecting plate 211 through the first pin shaft 21; the guide seat 24 and the guide column 25 are bolted to the lower side of the connecting plate 211; the fixing component 5 is connected to the support component 2 through.

[0059] S4: Install the fixing component 5 on the supporting component 2;

[0060] The fixing assembly 5 is welded to the supporting assembly 2 via the locking nut 54 .

[0061] S5: Install the locking assembly 3 between the guide frame assembly 1 and the support assembly 2, as shown in FIG. Figure 2 As shown;

[0062] The locking end 38 of the locking arm 32 is installed with a locking arm pad 31, and wear-resistant plates 34 are installed on both sides of the front and rear parts of the locking arm 32. The bearing 33 is installed in the bearing groove 37. The connecting end 39 is provided with a pin hole, and a self-lubricating sleeve 35 is installed in the pin hole.

[0063] S6: Position and install the support assembly 2 on the deck;

[0064] The connecting end 39 of the locking arm 32 passes through the guide mechanism 29 and is hinged to the telescopic rod of the hydraulic cylinder 22 through the second pin 23; and then the locking position of the locking arm 32 is adjusted and the support assembly 2 is welded to the ship deck.

[0065] S7: The buoy 61 is reconnected from the moon pool mouth 6;

[0066] The moon pool opening 6 provides a passage for the buoy 61 to float out of the deck.

[0067] The hydraulic cylinder 22 is controlled by an independent hydraulic power unit HPU.

[0068] like Figure 3 As shown, driven by the hydraulic power unit HPU, the hydraulic cylinder 22 pushes the locking arm 32 to move to the locking position of the upper ring of the buoy 61, and the locking arm 32 contacts and locks the upper ring of the buoy 61. After the seawater in the single-point tank is drained, the locking screw 52 is used to mechanically lock and fix the locking arm 32, and then the hydraulic system is depressurized.

[0069] S8: The buoy 61 is released from the moon pool mouth 6.

[0070] like Figure 4 As shown, the hydraulic power unit (HPU) is activated. Once the pressure in the hydraulic system reaches a specified value, the locking screw 52 is loosened, switching the locking arm 32 from mechanical to hydraulic fixation. After the hull winch lifts the buoy 61 to a specified load, the hydraulic power unit (HPU) drives the hydraulic cylinder 22 to disengage the locking arm 32 from the buoy 61.

[0071] like Figure 12 As shown, the guide frame assembly 1 has several sets, all of which are arranged around the moon pool mouth 6. The guide frame assembly 1 includes a cover plate 11, two side support frames 12 and two self-lubricating plates 13. The two side support frames 12 are relatively fixed at the bottom of the cover plate 11. A guide channel is formed between the two side support frames 12. The guide channel faces the moon pool mouth 6 to limit the moving direction of the locking assembly 3. The two self-lubricating plates 13 are respectively fixed on the opposite sides of the two side support frames 12. In order to increase the strength of the side support frame 12, two longitudinal ribs are vertically welded to the outer wall of the side support frame 12, and the longitudinal ribs are welded to the outer sides of the side support frames 12.

[0072] like Figure 1 As shown, in this embodiment, eight sets of guide frame assemblies 1 are preferably provided, with two sets forming a group, and the guide frame assemblies 1 are divided into four groups and evenly arranged on the ship deck at the moon pool mouth 6 .

[0073] like Figure 7 As shown, the slipper assembly 4 is arranged in the guide channel, and the slipper assembly 4 includes a support hinge 41, two baffles 42, a slipper pad 43 and a slide plate 44. The support hinge 41 is semi-cylindrical, and both ends of the support hinge 41 are fixedly connected with baffles 42. The baffles 42 extend from both ends of the support hinge 41 respectively. The slipper pad 43 is fixed to the bottom surface of the support hinge 41 by countersunk bolts, and the slide plate 44 is fixed to the hull deck by countersunk bolts. The slipper pad 43 is slidably arranged on the upper surface of the slide plate 44 and can slide back and forth on the slide plate 44.

[0074] The locking assembly 3 is hinged on the semi-cylindrical surface of the support hinge 41 through the bearing 33 and the bearing groove 37. The locking arm 32 pushes the sliding shoe pad 43 to slide back and forth along the slide plate 44, so that the locking assembly 3 slides back and forth along the guide channel 14 to tighten or loosen the float 61.

[0075] like Figure 5 As shown, the support assembly 2 includes two L-shaped support frames 210 and a plurality of connecting plates 211 . The two support frames 210 are arranged in parallel and fixedly connected in the middle by a plurality of connecting plates 211 .

[0076] A first pin shaft 21 is fixedly provided in the middle of the top of the vertical section of the two L-shaped support frames 210, and a hydraulic cylinder 22 is provided on the first pin shaft 21. The hydraulic cylinder 22 is hinged to the first pin shaft 21, and the hydraulic cylinder 22 extends from the hinged end to the inside of the support assembly 2. A second pin shaft 23 is fixedly provided at the end of the telescopic rod of the hydraulic cylinder 22, and the second pin shaft 23 is hingedly connected to the connecting end 39. The locking assembly 3 is driven to move by the telescopic rod of the hydraulic cylinder 22.

[0077] A guide mechanism 29 is provided between the horizontal sections of the two L-shaped support frames 210. The guide mechanism 29 includes a guide seat 24 and a guide column 25. The guide column 25 is located above the guide seat 24. The distance between the guide column 25 and the guide seat 24 just allows the connecting end 39 to pass between the two. The guide mechanism 29 supports and guides the movement of the connecting end 39 of the locking arm 32.

[0078] like Figure 10 As shown, the top surface of the guide seat 24 is set as an inclined surface, the inclined direction is toward the locking end 38, and the inclined angle is set to 8°~10°. The setting of the inclined surface reduces the friction resistance between the locking assembly 3 and the guide seat 24.

[0079] like Figure 11 As shown, the guide column 25 includes a steel pipe 26, a stud 27 and two guide column nuts 28. The two ends of the stud 27 are respectively passed through the two support frames 210 and fixed to the support frames 210 through the guide column nuts 28. The steel pipe 26 is rotatably sleeved on the outer ring of the stud 27. When the locking assembly 3 moves through the guide mechanism 29, the steel pipe 26 is rotatably connected to the stud 27, thereby reducing the friction resistance between the locking assembly 3 and the guide column 25.

[0080] like Figure 6 As shown, the locking assembly 3 includes a locking arm 32 , a plurality of wear-resistant plates 34 are fixedly provided on both sides of the locking arm 32 , and a locking end 38 and a connecting end 39 are respectively provided at both ends of the locking arm 32 .

[0081] The locking end 38 includes a locking arm pad 31, a bearing 33 and a bearing groove 37, and the connecting end 39 includes a self-lubricating sleeve 35 and a matching groove 36. The locking arm pad 31 is fixedly arranged on the top surface of the locking arm 32, and the bearing groove 37 is arranged on the bottom surface of the locking arm 32. The bearing 33 is located in the bearing groove 37 and is fixedly connected to the locking arm 32. The matching groove 36 is arranged on the top surface of the locking arm 32, and the self-lubricating sleeve 35 is arranged through the end of the locking arm 32.

[0082] The mating end of the locking arm 32 and the float 61 is set as the locking end 38, and the other end is the connecting end 39. The locking arm 32 is a variable diameter arm, and the outer diameter generally decreases gradually from the locking end 38 to the connecting end 39, thereby reducing the deadweight of the locking arm 32 while increasing the strength and locking force of the locking arm 32.

[0083] The bearing shoe groove 37 is buckled on the semi-cylindrical surface of the support hinge 41 to form a hinged connection with the support hinge 41. When the locking arm 32 is locked with the buoy 61, the angle of the locking end 38 can be adjusted according to the height of the buoy 61.

[0084] The engaging groove 36 can engage with the locking nut 54 to limit the rising height of the locking arm 32 .

[0085] like Figure 8 and 9As shown, the fixing assembly 5 includes a locking screw protective cap 51, a locking screw 52, a locking cap 53 and a locking nut 54. The locking screw 52 is rotatably arranged at the bottom of the locking nut 54, the locking cap 53 is fixed at the bottom of the locking screw 52, and the locking screw protective cap 51 is sleeved on the locking nut 54.

[0086] The locking nut 54 is welded to the top surface of the L-shaped horizontal section of the support frame 210 . When the locking screw 52 is rotated downward, the locking cap 53 presses against the locking arm 32 to fix the position of the locking assembly 3 .

[0087] The upper part of the locking screw 52 is sleeved in the locking screw protective cap 51, and the locking screw protective cap 51 prevents the locking screw 52 from being damaged by external forces; a positioning hole is provided on the top surface of the locking screw 52, and a positioning rib is provided on the bottom surface of the top wall of the locking screw protective cap 51. After the positioning hole and the positioning rib are plugged in and matched, the locking screw protective cap 51 is prevented from tilting after being sleeved on the outside of the locking screw 52.

[0088] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A design method for a hydraulic locking device for a FPSO single point mooring system, characterized in that: The steps include: S1: Install the guide frame assembly (1); S2: Install the sliding shoe assembly (4) into the guide frame assembly (1); S3: Assemble the support assembly (2); S4: Install the fixing assembly (5) on the supporting assembly (2); S5: Install the locking assembly (3) between the guide frame assembly (1) and the support assembly (2); S6: Position and install the support assembly (2) on the deck; S7: The buoy (61) is connected back from the moon pool mouth (6); S8: The buoy (61) is released from the moon pool mouth (6).

2. The design method of the hydraulic locking device of the FPSO single point mooring system according to claim 1 is characterized in that: The guide frame assembly (1) has several sets, all of which are arranged around the moon pool mouth (6). The guide frame assembly (1) includes a cover plate (11), two side support frames (12) and two self-lubricating plates (13). The two side support frames (12) are relatively fixed at the bottom of the cover plate (11), and a guide channel is formed between the two side support frames (12). The two self-lubricating plates (13) are respectively fixed on the opposite sides of the two side support frames (12).

3. The design method of the hydraulic locking device of the FPSO single point mooring system according to claim 2 is characterized in that: The sliding shoe assembly (4) is arranged in the guide channel, and the sliding shoe assembly (4) includes a support hinge (41), two baffles (42), a sliding shoe pad (43) and a slide plate (44). The support hinge (41) is semi-cylindrical, and both ends of the support hinge (41) are fixedly connected with the baffles (42). The sliding shoe pad (43) is fixedly arranged on the bottom surface of the support hinge (41), and the slide plate (44) is fixedly arranged on the hull deck. The sliding shoe pad (43) is slidably arranged on the upper surface of the slide plate (44).

4. The design method of the hydraulic locking device of the FPSO single point mooring system according to claim 1 is characterized in that: The support assembly (2) comprises two L-shaped support frames (210) and a plurality of connecting plates (211); the two support frames (210) are arranged in parallel and fixedly connected in the middle via the plurality of connecting plates (211).

5. The design method of the hydraulic locking device of the FPSO single point mooring system according to claim 4 is characterized in that: A first pin shaft (21) is fixedly provided in the middle of the top of the vertical section of the two L-shaped support frames (210), a hydraulic oil cylinder (22) is provided on the first pin shaft (21), the hydraulic oil cylinder (22) is hinged to the first pin shaft (21), and a second pin shaft (23) is fixedly provided at the end of the telescopic rod of the hydraulic oil cylinder (22).

6. The design method of the hydraulic locking device of the FPSO single point mooring system according to claim 4 is characterized in that: A guide mechanism (29) is provided between the horizontal sections of the two L-shaped support frames (210), and the guide mechanism (29) comprises a guide seat (24) and a guide column (25), wherein the guide column (25) is located above the guide seat (24).

7. The design method of the hydraulic locking device of the FPSO single point mooring system according to claim 6 is characterized in that: The guide column (25) comprises a steel pipe (26), a stud (27) and two guide column nuts (28). The two ends of the stud (27) are respectively passed through two support frames (210) and fixed to the support frames (210) through the guide column nuts (28). The steel pipe (26) is rotatably sleeved on the outer ring of the stud (27).

8. The design method of the hydraulic locking device of the FPSO single point mooring system according to claim 1 is characterized in that: The locking assembly (3) comprises a locking arm (32), a plurality of wear-resistant plates (34) are fixedly provided on both sides of the locking arm (32), and a locking end (38) and a connecting end (39) are respectively provided at both ends of the locking arm (32).

9. The design method of the hydraulic locking device of the FPSO single point mooring system according to claim 8, characterized in that: The locking end (38) includes a locking arm pad (31), a bearing (33) and a bearing groove (37); the connecting end (39) includes a self-lubricating sleeve (35) and a matching groove (36); the locking arm pad (31) is fixedly arranged on the top surface of the locking arm (32); the bearing groove (37) is arranged on the bottom surface of the locking arm (32); the bearing (33) is located in the bearing groove (37) and is fixedly connected to the locking arm (32); the matching groove (36) is arranged on the top surface of the locking arm (32); and the self-lubricating sleeve (35) is arranged through the end of the locking arm (32).

10. The design method of the hydraulic locking device of the FPSO single point mooring system according to claim 1, characterized in that: The fixing assembly (5) comprises a locking screw protective cap (51), a locking screw (52), a locking cap (53) and a locking nut (54); the locking screw (52) is rotatably arranged at the bottom of the locking nut (54); the locking cap (53) is fixedly arranged at the bottom of the locking screw (52); and the locking screw protective cap (51) is sleeved on the locking nut (54).

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