CN114717563A

CN114717563A - FPSO external anti-corrosion device

Info

Publication number: CN114717563A
Application number: CN202210531260.6A
Authority: CN
Inventors: 刘磊; 秦铁男; 朱东旭; 张馨予; 封加全
Original assignee: Dalian Kingmile Anticorrosion Technology Co ltd
Current assignee: Dalian Kingmile Anticorrosion Technology Co ltd
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2022-07-08
Also published as: WO2023221839A1

Abstract

The invention provides an FPSO external anticorrosion device, which comprises: the device comprises a ship body, a supporting arm, a composite cable and an auxiliary anode; one side of the ship body is at least provided with two supporting arms, the end parts of the supporting arms extend towards the direction far away from the ship body, the end parts of the supporting arms are connected with the composite cable, the composite cable is stretched by the supporting arms, and the auxiliary anode is arranged on the composite cable. The external anti-corrosion device for the FPSO disclosed by the invention has the advantages that the auxiliary anode is arranged outside the hull through the supporting arm, the problem of corrosion resistance of the FPSO under a waterline is solved, meanwhile, the protection current is adjustable, the application range is wider, the auxiliary anode is externally arranged, the self structure of the hull is not influenced, the stability and the reliability of the hull structure are ensured, meanwhile, the external anti-corrosion device is suitable for the existing FPSO, the external anti-corrosion structure disclosed by the invention can be realized by slightly changing the original hull structure, the use is convenient, and the maintenance is easy.

Description

FPSO external anti-corrosion device

Technical Field

The invention relates to the technical field of corrosion prevention, in particular to an FPSO external corrosion prevention device.

Background

Fpso (floating Production Storage and offloading), a floating oil and gas Storage and offloading unit, which can perform primary processing and Storage of crude oil, is called "offshore oil plant". The hull of the FPSO is exposed to salt fog, moisture, sea water and other environments for a long time, and is subjected to the action of surrounding media to generate severe electrochemical corrosion, so that structural corrosion is very serious. The corrosion reduces the mechanical property of the structural material and shortens the service life, and the FPSO is far away from the coast and cannot be periodically repaired and maintained like a ship, so the anticorrosion measures of the FPSO ship body are necessary.

At present, the FPSO hull anticorrosion measures are basically the same as those of the conventional ships, and mainly include protective measures of coating and cathodic protection. Generally, the outer surface of the hull below the waterline adopts combined protection, and the outer surface above the waterline adopts coating protection.

However, the sacrificial anode has an unadjustable protection current, is not suitable for use in a high resistivity environment, restricts the applicable environment of the FPSO, has a short service life, and needs to be frequently replaced for the FPSO working for a long time at sea.

Disclosure of Invention

The invention provides an FPSO external anti-corrosion device, which aims to solve the problems.

An external anticorrosive device of FPSO includes: the device comprises a ship body, a supporting arm, a composite cable and an auxiliary anode;

one side of the ship body is at least provided with two supporting arms, the end parts of the supporting arms extend towards the direction far away from the ship body, the end parts of the supporting arms are connected with the composite cable, the composite cable is stretched by the supporting arms, and the auxiliary anode is arranged on the composite cable.

The lifting device comprises a winch, a lifting platform, a steel wire rope and a track, the winch is installed on the ship body and connected with the lifting platform through the steel wire rope, the lifting platform is arranged on the track, the track is arranged on the outer side of the ship body in the vertical direction, and the supporting arm is fixed on the lifting platform.

The winch can drive the supporting arm to rotate through the speed reducer, so that the composite cable rotates above the ship body.

The lifting device comprises a winch and a steel wire rope, the winch is mounted on the ship body and connected with the end part of the supporting arm through the steel wire rope, the supporting arm is hinged to the side face of the ship body, and the winch can pull up the supporting arm through the steel wire rope.

Further, the support arm is hinged to the side face of the ship body through an installation shaft, the axis of the installation shaft is perpendicular to the horizontal plane, the installation shaft is connected with a driving structure, and the driving structure is used for driving the installation shaft to rotate.

Furthermore, the support arm is hinged to the side face of the ship body through an installation shaft, the axis of the installation shaft is parallel to the fore-aft line of the ship body, the installation shaft is connected with a driving structure, and the driving structure is used for driving the installation shaft to rotate.

Furthermore, the support arm is a hydraulic telescopic arm or an electric telescopic arm, the support arm is arranged on the side surface of the ship body and is positioned under the water surface, and the support arm is parallel to the horizontal plane.

Furthermore, the support arm is a hydraulic telescopic arm or an electric telescopic arm, the support arm is installed on the ship body, the support arm extends obliquely below the ship body, a support piece is arranged between the support arm and the side face of the ship body, and the end part of the support arm extends into the water surface.

Further, the end part of the supporting arm is provided with a tensioning device, and the tensioning device can tension the composite cable.

The external anti-corrosion device for the FPSO disclosed by the invention has the advantages that the auxiliary anode is arranged outside the hull through the supporting arm, the problem of corrosion resistance of the FPSO under a waterline is solved, meanwhile, the protection current is adjustable, the application range is wider, the auxiliary anode is externally arranged, the self structure of the hull is not influenced, the stability and the reliability of the hull structure are ensured, meanwhile, the external anti-corrosion device is suitable for the existing FPSO, the external anti-corrosion structure disclosed by the invention can be realized by slightly changing the original hull structure, the use is convenient, and the maintenance is easy.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of an FPSO external corrosion prevention device disclosed in embodiment 1 of the present invention;

FIG. 2 is a schematic side view of the FPSO external corrosion protection device disclosed in embodiment 1 of the present invention;

FIG. 3 is a schematic front view of the FPSO external corrosion protection apparatus disclosed in embodiment 1 of the present invention;

FIG. 4 is a schematic structural diagram of an FPSO external corrosion protection device disclosed in embodiment 2 of the present invention;

FIG. 5 is an enlarged view of portion A of FIG. 4;

FIG. 6 is a schematic front view of an FPSO external corrosion protection device disclosed in embodiment 2 of the present invention;

FIG. 7 is a schematic structural diagram of an FPSO external corrosion protection device disclosed in embodiment 3 of the present invention;

FIG. 8 is a schematic front view of the FPSO external corrosion protection apparatus disclosed in embodiment 3 of the present invention;

FIG. 9 is a schematic structural diagram of an FPSO external corrosion protection device disclosed in embodiment 4 of the present invention;

FIG. 10 is an enlarged view of portion B of FIG. 9;

FIG. 11 is a schematic top view of the FPSO external corrosion protection apparatus disclosed in embodiment 4 of the present invention;

FIG. 12 is a schematic structural diagram of an FPSO external corrosion protection device disclosed in embodiment 5 of the present invention;

FIG. 13 is an enlarged view of portion C of FIG. 12;

FIG. 14 is a schematic front view of an FPSO external corrosion protection device disclosed in embodiment 5 of the present invention;

fig. 15 is a schematic structural view of an FPSO external corrosion prevention device disclosed in embodiment 6 of the present invention;

FIG. 16 is a schematic front view of an FPSO external corrosion protection device disclosed in embodiment 6 of the present invention;

FIG. 17 is a schematic structural view of an FPSO external corrosion protection device disclosed in embodiment 7 of the present invention;

fig. 18 is a schematic front view of the structure of the FPSO external corrosion prevention device disclosed in embodiment 7 of the present invention.

In the figure: 1. a hull; 2. a support arm; 3. a composite cable; 4. an auxiliary anode; 5. a winch; 6. a lifting platform; 7. a wire rope; 8. a track; 9. a motor; 10. a speed reducer; 11. installing a shaft; 12. a drive structure; 13. a tensioning device.

Detailed Description

In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

as shown in fig. 1-3, the present embodiment discloses an external anti-corrosion device for FPSO, which is characterized in that: the device comprises a ship body 1, a supporting arm 2, a composite cable 3 and an auxiliary anode 4;

1 one side of hull is equipped with two at least support arm 2, the tip of support arm 2 is to keeping away from 1 direction of hull extends, the tip of support arm 2 with compound cable 3 is connected, compound cable 3 by support arm 2 stretch-draw, supplementary positive pole 4 is located on the compound cable 3.

The ship body lifting device comprises a winch 5, a lifting platform 6, a steel wire rope 7 and a track 8, wherein the winch 5 is installed on the ship body 1, the winch 5 is connected with the lifting platform 6 through the steel wire rope 7, the lifting platform 6 is arranged on the track 8, the track 8 is arranged on the outer side of the ship body 1 in the vertical direction, and the supporting arm 2 is fixed on the lifting platform 6.

The end part of the supporting arm 2 is provided with a tensioning device 13, and the tensioning device 13 can tension the composite cable 3.

In the embodiment, the supporting arm 2 is parallel to the horizontal plane and is vertically fixed on the lifting platform 6, the lifting platform 6 is provided with a sliding block and can move on the track 8, the steel wire rope 7 is fixedly connected with the lifting platform 6, the winch 5 pulls the steel wire rope 7 to drive the lifting platform 6 to move, and the supporting arm 2 moves along with the lifting platform 6, so that the composite cable 3 can leave the water surface or enter the water.

The size and the number of the auxiliary anodes are determined by calculation according to the protected structure area, the coating condition, the service working condition, the design protection age and the like, and the arrangement positions of the auxiliary anodes are determined by calculation by using cathode protection numerical simulation software; and the auxiliary anode is arranged on the composite cable, corresponding mechanical calculation is carried out according to the hydrodynamic calculation result of the composite cable, and the specifications of the composite cable, the fixing device of the lifting platform and the tensioning device are determined.

The tensioning device 13 can be a turnbuckle or a waterproof electric telescopic rod, and can also be a tensioning structure in other forms. After the auxiliary anode composite cable is tensioned through the prefabricated tensioning force, the integral rigidity of the auxiliary anode composite cable is improved, the alternating stress load under the action of sea wave flow and the external force damage under the extreme ocean working condition can be effectively resisted, and the composite cable can be prevented from colliding with a ship body under the action of sea current.

When the device normally works, the composite cable 3 and the auxiliary anode 4 are both underwater, and when the device needs to be overhauled or maintained, the composite cable 3 is pulled up through the winch 5.

The FPSO external anti-corrosion device disclosed by the invention can be realized by slightly changing the original structure of the FPSO, is convenient to install, does not need to operate the hull during maintenance, does not influence the hull structure, and is convenient to maintain.

The external anti-corrosion device for the FPSO disclosed by the invention adopts impressed current cathodic protection, and the auxiliary anode is arranged outside the hull through the supporting arm, so that the problem of corrosion resistance of the FPSO under a waterline is solved, meanwhile, the protection current is adjustable, the application range is wider, the auxiliary anode is externally arranged, the self structure of the hull is not influenced, the stability and the reliability of the hull structure are ensured, meanwhile, the external anti-corrosion device is suitable for the existing FPSO, the external anti-corrosion structure disclosed by the invention can be realized by slightly changing the original hull structure, the use is convenient, and the maintenance is easy.

Example 2

As shown in fig. 4 to 6, the present embodiment is different from embodiment 1 in that the lifting device includes a motor 9 and a speed reducer 10, the motor 9 is mounted on the hull 1 and connected to the support arm 2 through the speed reducer 10, and the winch 5 can drive the support arm 2 to rotate through the speed reducer 10, so that the composite cable 3 is rotated above the hull 1.

In this embodiment, the motor 9 and the speed reducer 10 are installed on the side of the ship body, the torque is transmitted through the motor 9 and the speed reducer 10, so that the support arm 2 rotates, and the rotation axis of the support arm 2 is parallel to the fore-aft line of the ship body 1.

Under operating condition, support arm 2 syncline below stretches into the aquatic, for the hull surface provides anticorrosive protection, when needing to overhaul the maintenance, starter motor 9 makes support arm 2 rotate to hull 1 top, can overhaul.

Example 3

As shown in fig. 7 and 8, the present embodiment is different from embodiment 1 in that the lifting device includes a winch 5 and a wire rope 7, the winch 5 is mounted on the hull 1 and connected to an end of the support arm 2 through the wire rope 7, the support arm 2 is hinged to a side surface 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 fig. 9-11, this embodiment is different from embodiment 1 in that the support arm 2 is hinged to the side of the hull 1 through a mounting shaft 11, the axis of the mounting shaft 11 is perpendicular to the horizontal plane, the mounting shaft 11 is connected to a driving mechanism 12, and the driving mechanism 12 is used for driving the mounting shaft 11 to rotate.

The driving structure 12 in this embodiment adopts a waterproof motor, and the mounting shaft 11 and the support arm 2 are driven to rotate by the motor, and other driving structures can be adopted. The support arm 2 rotates, makes compound cable 3 and supplementary positive pole 4 paste and lean on at the hull limit, and the maintainer can overhaul through rope ladder or hull maintenance platform.

Example 5

As shown in fig. 12-14, this embodiment is different from embodiment 1 in that the support arm 2 is hinged to the side of the hull 1 by a mounting shaft 11, the axis of the mounting shaft 11 is parallel to the fore-aft line of the hull 1, the mounting shaft 11 is connected to a driving mechanism 12, and the driving mechanism 12 is used for driving the mounting shaft 11 to rotate.

The driving structure 12 in this embodiment adopts a waterproof motor, and the mounting shaft 11 and the support arm 2 are driven to rotate by the motor, and other driving structures can be adopted. The support arm 2 rotates, makes the compound cable 3 of locating the 2 tip of support arm get into or leave the aquatic, leaves the aquatic after, and compound cable 3 is rotatable to hull topside, and the maintainer can overhaul the maintenance on the hull.

Example 6

As shown in fig. 15 and 16, the present embodiment is different from embodiment 1 in that the support arm 2 is a hydraulic telescopic arm or an electric telescopic arm, the support arm 2 is installed on the side surface of the hull 1 and is located under the water surface, and the support arm 2 is parallel to the horizontal plane.

In this embodiment, support arm 2 adopts flexible arm form, installs additional in hull both sides, can adopt hydraulic drive or electric drive, and under normal operating condition, support arm 2 stretches out, and during the maintenance, support arm 2 withdraws.

Example 7

As shown in fig. 17 and 18, the present embodiment is different from embodiment 6 in that the support arm 2 is attached to the hull 1, the support arm 2 extends obliquely downward, a support member is provided between the support arm 2 and the side surface of the hull 1, and the end portion of the support arm 2 extends below the water surface.

In this embodiment, support arm 2 is installed at the hull topside, the power structure of better protection support arm 2, under 2 tip of support arm stretched into the surface of water, certain angle had between support arm 2 and the horizontal plane, set up support piece between support arm 2 and the hull, it is firm to keep the stability of support arm 2, under the normal operating condition, support arm 2 stretches out, when overhauing and maintaining, support arm 2 withdrawal makes compound cable and supplementary positive pole be close to the hull, convenient maintenance.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The external anticorrosive device of FPSO, which is characterized by comprising: the device comprises a ship body (1), a supporting arm (2), a composite cable (3) and an auxiliary anode (4);

hull (1) one side is equipped with two at least support arm (2), the tip of support arm (2) is to keeping away from hull (1) direction extends, the tip of support arm (2) with composite cable (3) are connected, composite cable (3) by support arm (2) stretch-draw, supplementary positive pole (4) are located on the composite cable (3).

2. The FPSO external anticorrosion device according to claim 1, further comprising a lifting device, wherein the lifting device comprises 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), the winch (5) is connected with the lifting platform (6) through the steel wire rope (7), the lifting platform (6) is arranged on the track (8), the track (8) is arranged outside the hull (1) in the vertical direction, and the supporting arm (2) is fixed on the lifting platform (6).

3. The FPSO external anticorrosion device according to claim 1, further comprising a lifting device, wherein the lifting device comprises a motor (9) and a speed reducer (10), the motor (9) is mounted on the hull (1) and is connected with the supporting arm (2) through the speed reducer (10), and the winch (5) can drive the supporting arm (2) to rotate through the speed reducer (10), so that the composite cable (3) rotates above the hull (1).

4. The FPSO external anticorrosion device according to claim 1, further comprising a lifting device, wherein the lifting device comprises a winch (5) and a steel wire rope (7), the winch (5) is installed on the hull (1) and connected with the end of the supporting arm (2) through the steel wire rope (7), the supporting arm (2) is hinged to the side surface of the hull (1), and the winch (5) can pull up the supporting arm (2) through the steel wire rope (7).

5. The external corrosion protection device for FPSO according to claim 1, wherein the supporting arm (2) is hinged to the side of the hull (1) through a mounting shaft (11), the axis of the mounting shaft (11) is perpendicular to the horizontal plane, the mounting shaft (11) is connected with a driving mechanism (12), and the driving mechanism (12) is used for driving the mounting shaft (11) to rotate.

6. The FPSO external corrosion protection device according to claim 1, wherein the supporting arm (2) is hinged to the side of the hull (1) through a mounting shaft (11), the axis of the mounting shaft (11) is parallel to the fore-aft line of the hull (1), the mounting shaft (11) is connected with a driving structure (12), and the driving structure (12) is used for driving the mounting shaft (11) to rotate.

7. The external corrosion protection device of FPSO according to claim 1, wherein the supporting arm (2) is a hydraulic telescopic arm or an electric telescopic arm, the supporting arm (2) is installed at the side of the hull (1) and is located under the water surface, and the supporting arm (2) is parallel to the horizontal plane.

8. The external corrosion prevention device for the FPSO as claimed in claim 1, wherein the supporting arm (2) is a hydraulic telescopic arm or an electric telescopic arm, the supporting arm (2) is installed on the hull (1), the supporting arm (2) extends obliquely downwards, a supporting member is arranged between the supporting arm and the side surface of the hull (1), and the end part of the supporting arm (2) extends into the water surface.

9. The external corrosion protection device for an FPSO according to claim 1, wherein a tensioning device (13) is provided at the end of the support arm (2), the tensioning device (13) being capable of tensioning the composite cable (3).