WO2023221839A1

WO2023221839A1 - Fpso external anti-corrosion apparatus

Info

Publication number: WO2023221839A1
Application number: PCT/CN2023/093353
Authority: WO
Inventors: 刘磊; 秦铁男; 朱东旭; 张馨予; 封加全
Original assignee: 大连科迈尔防腐科技有限公司
Priority date: 2022-05-16
Filing date: 2023-05-11
Publication date: 2023-11-23
Also published as: CN114717563A

Abstract

An FPSO external anti-corrosion apparatus, comprising: a ship body (1), supporting arms (2), a composite cable (3), and auxiliary anodes (4). At least two supporting arms (2) are provided on one side of the ship body (1); end portions of the supporting arms (2) extend in a direction away from the ship body (1); the end portions of the supporting arms (2) are connected to the composite cable (3); the composite cable (3) is tensioned by the supporting arms (2); the auxiliary anodes (4) are provided on the composite cable (3).

Description

FPSO external anti-corrosion device

Technical field

The invention relates to the field of anti-corrosion technology, and in particular to an FPSO external anti-corrosion device.

Background technique

FPSO (Floating Production Storage and Offloading), a floating oil storage and offloading device, can perform preliminary processing and storage of crude oil and is called an "offshore oil factory". The FPSO hull has been exposed to salt spray, moisture, seawater and other environments for a long time, and is subject to severe electrochemical corrosion due to the action of the surrounding media, so the structural corrosion is very serious. Corrosion reduces the mechanical properties of structural materials and shortens the service life. FPSO is far from the coast and cannot be docked for repair and maintenance regularly like ships. Therefore, anti-corrosion measures for the FPSO hull are very necessary.

At present, the anti-corrosion measures for FPSO hulls are basically the same as those for conventional ships, mainly coating and cathodic protection measures. Generally, the outer surface of the hull below the waterline is protected by joint protection, and the outer surface above the waterline is protected by coating.

However, the sacrificial anode protection current is not adjustable and is not suitable for use in high resistivity environments, which restricts the applicable environment of FPSO. The life of the sacrificial anode is short. For FPSOs that work at sea for a long time, the sacrificial anode needs to be replaced frequently because the sacrificial anode is installed on the surface of the hull. , Frequent replacement and maintenance have an impact on the stability of the hull structure, and the sacrificial anode consumes non-ferrous metals, causing pollution to the environment.

Contents of the invention

The present invention provides an FPSO external anti-corrosion device to solve the above problems.

An FPSO external anti-corrosion device, including: a hull, a support arm, a composite cable and an auxiliary anode;

At least two support arms are provided on one side of the hull. The ends of the support arms extend in a direction away from the hull. The ends of the support arms are connected to the composite cable. The composite cable is formed by the composite cable. The support arm is tensioned, and the auxiliary anode is provided on the composite cable.

Further, it also includes a lifting device. The lifting device includes a winch, a lifting platform, a steel wire rope and a track. The winch is installed on the hull. The winch is connected to the lifting platform through the steel wire rope. The lifting platform is provided on the rail, which is provided on the outside of the hull in a vertical direction, and the support arm is fixed on the lifting platform.

Further, a lifting device is included. The lifting device includes a motor and a reducer. The motor is installed on the hull and is connected to the support arm through the reducer. The winch can pass through the reducer. The support arm is driven to rotate so that the composite cable rotates above the hull.

Further, a lifting device is included. The lifting device includes a winch and a steel wire rope. The winch is installed on the hull and is connected to the end of the support arm through the steel wire rope. The support arm is hinged to the On the side of the hull, the winch can pull up the support arm through the wire rope.

Further, the support arm is hinged to the side of the hull through a mounting shaft, the axis of the mounting shaft is perpendicular to the horizontal plane, the mounting shaft is connected to a driving structure, and the driving structure is used to drive the mounting shaft to rotate.

Further, the support arm is hinged to the side of the hull through a mounting shaft, the axis of the mounting shaft is parallel to the bow and stern lines of the hull, the mounting shaft is connected to a driving structure, and the driving structure is used to drive the The installation shaft rotates.

Further, the support arm is a hydraulic telescopic arm or an electric telescopic arm, the support arm is installed on the side of the hull and is located under the water surface, and the support arm is parallel to the horizontal plane.

Further, the support arm is a hydraulic telescopic arm or an electric telescopic arm. The support arm is installed on the hull. The support arm extends obliquely downward, and a support member is provided between the support arm and the side of the hull. The end of the support arm extends into the water surface.

Further, a tensioning device is provided at the end of the support arm, and the tensioning device can tension the composite cable.

The FPSO external anti-corrosion device disclosed by the present invention sets an auxiliary anode outside the hull through a support arm, which solves the problem of FPSO anti-corrosion under the waterline. At the same time, the protection current is adjustable and suitable for use. It has a wider range of applications, and the auxiliary anode is installed externally, which does not affect the structure of the hull itself, ensuring the stability and reliability of the hull structure. At the same time, it is suitable for existing FPSO, and the disclosure of the present invention can be realized by making only a few changes to the original hull structure. The external anti-corrosion structure is convenient to use and easy to maintain.

Description of the drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of an FPSO external anti-corrosion device disclosed in Embodiment 1 of the present invention;

Figure 2 is a schematic side view of the structure of the FPSO external anti-corrosion device disclosed in Embodiment 1 of the present invention;

Figure 3 is a schematic structural front view of the FPSO external anti-corrosion device disclosed in Embodiment 1 of the present invention;

Figure 4 is a schematic structural diagram of an FPSO external anti-corrosion device disclosed in Embodiment 2 of the present invention;

Figure 5 is an enlarged schematic diagram of part A in Figure 4;

Figure 6 is a schematic structural front view of the FPSO external anti-corrosion device disclosed in Embodiment 2 of the present invention;

Figure 7 is a schematic structural diagram of the FPSO external anti-corrosion device disclosed in Embodiment 3 of the present invention;

Figure 8 is a schematic structural front view of the FPSO external anti-corrosion device disclosed in Embodiment 3 of the present invention;

Figure 9 is a schematic structural diagram of the FPSO external anti-corrosion device disclosed in Embodiment 4 of the present invention;

Figure 10 is an enlarged schematic diagram of part B in Figure 9;

Figure 11 is a schematic structural top view of the FPSO external anti-corrosion device disclosed in Embodiment 4 of the present invention;

Figure 12 is a schematic structural diagram of an FPSO external anti-corrosion device disclosed in Embodiment 5 of the present invention;

Figure 13 is an enlarged schematic diagram of part C in Figure 12;

Figure 14 is a schematic structural front view of the FPSO external anti-corrosion device disclosed in Embodiment 5 of the present invention;

Figure 15 is a schematic structural diagram of the FPSO external anti-corrosion device disclosed in Embodiment 6 of the present invention;

Figure 16 is a schematic structural front view of the FPSO external anti-corrosion device disclosed in Embodiment 6 of the present invention;

Figure 17 is a schematic structural diagram of the FPSO external anti-corrosion device disclosed in Embodiment 7 of the present invention;

Figure 18 is a schematic structural front view of an FPSO external anti-corrosion device disclosed in Embodiment 7 of the present invention.

In the picture: 1. Hull; 2. Support arm; 3. Composite cable; 4. Auxiliary anode; 5. Winch; 6. Lifting platform; 7. Wire rope; 8. Track; 9. Motor; 10. Reducer; 11. Install the shaft; 12. Driving structure; 13. Tensioning device.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

Example 1:

As shown in Figures 1-3, this embodiment discloses an FPSO external anti-corrosion device, which is characterized by including: a hull 1, a support arm 2, a composite cable 3 and an auxiliary anode 4;

There are at least two support arms 2 on one side of the hull 1. The ends of the support arms 2 extend in a direction away from the hull 1. The ends of the support arms 2 are connected to the composite cable 3. The composite cable 3 is stretched by the support arm 2 , and the auxiliary anode 4 is provided on the composite cable 3 .

This embodiment also includes a lifting device. The lifting device includes a winch 5, a lifting platform 6, a steel wire rope 7, and a track 8. The winch 5 is installed on the hull 1, and the winch 5 is connected to the ship through the steel wire rope 7. The lifting platform 6 is connected, and the lifting platform 6 is located at On the rail 8 , the rail 8 is arranged on the outside of the hull 1 in the vertical direction, and the support arm 2 is fixed on the lifting platform 6 .

A tensioning device 13 is provided at the end of the support arm 2, and the tensioning device 13 can tension the composite cable 3.

In this embodiment, the support arm 2 is parallel to the horizontal plane and vertically fixed on the lifting platform 6. The lifting platform 6 is equipped with a slider and can move on the track 8. The wire rope 7 is fixedly connected to the lifting platform 6, and the winch 5 pulls the wire rope 7 , drives the lifting platform 6 to move, and the support arm 2 moves with the lifting platform 6, so that the composite cable 3 can leave the water or enter the water.

The size and quantity of the auxiliary anodes are calculated and determined based on the area of the protected structure, coating conditions, service conditions, design protection years, etc. The layout position of the auxiliary anodes is calculated and determined using cathodic protection numerical simulation software; the auxiliary anodes are installed on the composite cable, according to the composite According to the cable hydrodynamic calculation results, corresponding mechanical calculations are performed to determine the specifications of the composite cable, the fixing device and the tensioning device of the composite cable and the lifting platform.

The tensioning device 13 can use flower basket bolts or waterproof electric telescopic rods, or other forms of tensioning structures. After the auxiliary anode composite cable is tensioned by prefabricated tension, its overall rigidity is improved, which can effectively resist the alternating stress load caused by seawater waves and external force damage under extreme marine conditions, and can also prevent the composite cable from being damaged by sea currents. The bottom collided with the hull.

During normal operation, the composite cable 3 and the auxiliary anode 4 are both underwater. When inspection or maintenance is required, the composite cable 3 can be pulled up by the winch 5 .

The FPSO external anti-corrosion device disclosed in the present invention can be implemented with a small amount of changes to the original structure of the FPSO itself. It is easy to install. There is no need to operate the hull during maintenance, it does not affect the hull structure, and it is convenient for maintenance.

The FPSO external anti-corrosion device disclosed by the present invention adopts impressed current cathodic protection, and sets an auxiliary anode outside the hull through a support arm, which solves the problem of FPSO anti-corrosion under the waterline. At the same time, the protection current is adjustable and has a wider applicable range. The auxiliary anode External installation does not affect the structure of the hull itself, ensuring the stability and reliability of the hull structure. At the same time, it is suitable for existing FPSOs. The external anti-corrosion structure disclosed in the present invention can be realized with a small amount of changes to the original hull structure, which is convenient Use and easy to repair.

Example 2

As shown in Figures 4-6, the difference between this embodiment and Embodiment 1 is that the lifting device includes a motor 9 and a reducer 10. The motor 9 is installed on the hull 1 and passes through the reducer 10. Connected to the support arm 2 , the winch 5 can drive the support arm 2 to rotate through the reducer 10 so that the composite cable 3 rotates above the hull 1 .

In this embodiment, the motor 9 and the reducer 10 are installed on the side of the hull. The torque is transmitted through the motor 9 and the reducer 10 to rotate the support arm 2. The rotation axis of the support arm 2 is parallel to the bow and stern lines of the hull 1.

In the working state, the support arm 2 extends diagonally downward into the water to provide anti-corrosion protection for the surface of the hull. When maintenance is required, start the motor 9 to rotate the support arm 2 to the top of the hull 1, and then the maintenance can be carried out.

Example 3

As shown in Figures 7 and 8, the difference between this embodiment and Embodiment 1 is that the lifting device includes a winch 5 and a steel wire rope 7. The winch 5 is installed on the hull 1 and connected to the ship through the steel wire rope 7. The end of the support arm 2 is connected, the support arm 2 is hinged to the side of the hull 1 , and the winch 5 can pull up the support arm 2 through the wire rope 7 .

In this embodiment, the winch 5 drives the support arm 2 through the wire rope 7 so that the support arm 2 can rotate, and the composite cable 3 provided at the end of the support arm 2 enters or leaves the water through rotation.

Example 4

As shown in Figures 9-11, the difference between this embodiment and Embodiment 1 is that the support arm 2 is hinged to the side of the hull 1 through a mounting shaft 11, and the axis of the mounting shaft 11 is perpendicular to the horizontal plane. The shaft 11 is connected to a driving structure 12, and the driving structure 12 is used to drive the mounting shaft 11 to rotate.

The driving structure 12 in this embodiment uses a waterproof motor, and the motor drives the installation shaft 11 and the support arm 2 to rotate. Other forms of driving structures can also be used. The support arm 2 rotates so that the composite cable 3 and the auxiliary anode 4 are close to the hull, and maintenance personnel can perform maintenance through a rope ladder or the hull maintenance platform.

Example 5

As shown in Figures 12-14, the difference between this embodiment and Embodiment 1 is that the support arm 2 is hinged to the side of the hull 1 through a mounting shaft 11, and the axis of the mounting shaft 11 is parallel to the side of the hull 1. Fore and stern line, the mounting shaft 11 is connected to the driving structure 12, and the driving structure 12 is used to drive the mounting shaft 11 to rotate.

The driving structure 12 in this embodiment uses a waterproof motor, and the motor drives the installation shaft 11 and the support arm 2 to rotate. Other forms of driving structures can also be used. The support arm 2 rotates so that the composite cable 3 located at the end of the support arm 2 enters or leaves the water. After leaving the water, the composite cable 3 can rotate to the side of the hull, and maintenance personnel can perform maintenance on the hull.

Example 6

As shown in Figures 15 and 16, the difference between this embodiment and Embodiment 1 is that the support arm 2 is a hydraulic telescopic arm or an electric telescopic arm, and the support arm 2 is installed on the side of the hull 1 and is located under the water surface. , the support arm 2 is parallel to the horizontal plane.

In this embodiment, the support arm 2 is in the form of a telescopic arm, which is installed on both sides of the hull. It can be driven by hydraulic pressure or electric drive. Under normal working conditions, the support arm 2 is extended, and during maintenance, the support arm 2 is retracted.

Example 7

As shown in Figures 17 and 18, the difference between this embodiment and Embodiment 6 is that the support arm 2 is installed on the hull 1, the support arm 2 extends diagonally downward, and is in contact with the side of the hull 1 There are supports between them, and the ends of the support arms 2 extend into the water surface.

In this embodiment, the support arm 2 is installed on the side of the hull to better protect the dynamic structure of the support arm 2. The end of the support arm 2 extends into the water, and there is a certain angle between the support arm 2 and the horizontal plane. Supports are provided between the hulls to keep the support arm 2 stable and firm. Under normal working conditions, the support arm 2 is extended. During maintenance, the support arm 2 is retracted to bring the composite cable and auxiliary anode close to the hull to facilitate maintenance.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to apply the methods described in the foregoing embodiments Modify the technical solution, or make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of each embodiment of the present invention.

Claims

An FPSO external anti-corrosion device, characterized by including: a hull (1), a support arm (2), a composite cable (3) and an auxiliary anode (4);

At least two support arms (2) are provided on one side of the hull (1). The ends of the support arms (2) extend in a direction away from the hull (1). The ends of the support arms (2) The end is connected to the composite cable (3), the composite cable (3) is stretched by the support arm (2), and the auxiliary anode (4) is provided on the composite cable (3).
An FPSO external anti-corrosion device according to claim 1, further comprising a lifting device including a winch (5), a lifting platform (6), a wire rope (7) and a track (8), The winch (5) is installed on the hull (1), and the winch (5) is connected to the lifting platform (6) through the wire rope (7). The lifting platform (6) is located on the On the track (8), the track (8) is arranged on the outside of the hull (1) in the vertical direction, and the support arm (2) is fixed on the lifting platform (6).
An FPSO external anti-corrosion device according to claim 1, characterized in that it also includes a lifting device, the lifting device includes a motor (9) and a reducer (10), the motor (9) is installed on the On the hull (1), and connected to the support arm (2) through the reducer (10), the winch (5) can drive the support arm (2) to rotate through the reducer (10), The composite cable (3) is rotated to the top of the hull (1).
An FPSO external anti-corrosion device according to claim 1, characterized in that it also includes a lifting device, the lifting device includes a winch (5) and a steel wire rope (7), the winch (5) is installed on the hull (1), and is connected to the end of the support arm (2) through the steel wire rope (7). The support arm (2) is hinged to the side of the hull (1), and the winch (5) can The support arm (2) is pulled up through the wire rope (7).
An FPSO external anti-corrosion device according to claim 1, characterized in that the support arm (2) is hinged to the side of the hull (1) through a mounting shaft (11), and the mounting shaft (11) The axis is perpendicular to the horizontal plane, and the mounting shaft (11) is connected to a driving structure (12). The driving structure (12) is used to drive the mounting shaft (11) to rotate.
An FPSO external anti-corrosion device according to claim 1, characterized in that the support arm (2) is hinged to the side of the hull (1) through a mounting shaft (11), The axis of the installation shaft (11) is parallel to the bow and stern lines of the hull (1). The installation shaft (11) is connected to a driving structure (12), and the driving structure (12) is used to drive the installation. The shaft (11) rotates.
An FPSO external anti-corrosion device according to claim 1, characterized in that the support arm (2) is a hydraulic telescopic arm or an electric telescopic arm, and the support arm (2) is installed on the hull (1) Side and located under the water surface, the support arm (2) is parallel to the horizontal plane.
An FPSO external anti-corrosion device according to claim 1, characterized in that the support arm (2) is a hydraulic telescopic arm or an electric telescopic arm, and the support arm (2) is installed on the hull (1) On the boat, the support arm (2) extends obliquely downward, and a support member is provided between the side of the hull (1) and the end of the support arm (2) extends into the water surface.
An FPSO external anti-corrosion device according to claim 1, characterized in that a tensioning device (13) is provided at the end of the support arm (2), and the tensioning device (13) can tighten the Composite cable(3).