Service life prolonging system for cathode protection of ocean platform steel structure

Abstract

The utility model discloses a life prolonging system for cathode protection of an ocean platform steel structure, which comprises a sacrificial anode and a clamp, the clamp comprises a clamp body used for being clamped on an ocean platform steel structure steel pipe, the clamp body is connected with a conducting rod, and the clamp body is provided with a wire holder; the wire holder is electrically connected with a plurality of sacrificial anodes through cables, the clamp body is connected with a rope clamping plate used for clamping the cables, and the clamp has the advantages that the wire holder is arranged on the clamp, so that more sacrificial anodes can be connected through the cables, and a longer service life prolonging effect is achieved; the sacrificial anode can sink to the seabed with a certain distance from the steel pipe of the ocean platform steel structure, so that the influence of excessive load on the stability of the ocean platform steel structure is avoided; and the clamp body is connected with the rope clamping plate for clamping the cable, so that the cable is prevented from being disconnected from the wire holder in the construction process or under the long-time driving of ocean current, and the cathode protection failure caused by the fact that the sacrificial anode is electrically disconnected from the ocean platform steel structure is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of cathode protection devices for marine platform steel structures, in particular to a life extension system for cathode protection of marine platform steel structures. Background Art

[0002] The vast majority of existing offshore platforms use cathodic protection for corrosion protection.

[0003] With the increase in the service life of offshore platforms, the cathodic protection systems of many offshore platforms have approached or even exceeded the service life of the original design, and there is an urgent need to extend the life of the cathodic protection systems of these platform steel structures. If conventional cathodic protection methods are used for life extension repair, a large amount of underwater operations are required, such as underwater grinding, wiring, hoisting, fixing and welding; the underwater working conditions are harsh, the technical difficulty is high, and the construction cost is high. Especially for deep-sea jacket platforms, underwater work is very dangerous, and the safety of underwater operators is difficult to guarantee. Relevant personnel have developed a sacrificial anode stack for rapid repair of cathodic protection, such as the publication number CN104278277A, which is easy to use, does not require underwater welding, reduces underwater construction workload, has a fast maintenance speed, and is loaded with four parallel sacrificial anodes, which can extend the cathodic protection time for a long time, but its cable may be disconnected from the clamp during the construction process and in the disturbance of ocean currents, resulting in the sacrificial anode being disconnected from the steel structure of the offshore platform, causing the cathodic protection to fail, which needs to be improved. Utility Model Content

[0004] A technical problem to be solved by the present application is to overcome the defects of the above-mentioned related technologies and provide a life extension system which is easy to use, does not require underwater welding, reduces underwater construction workload, has a fast maintenance speed, and can provide a long and stable cathodic protection time for the steel structure of the offshore platform.

[0005] The technical solution adopted by the present application to solve the technical problem is: a life extension system for cathodic protection of offshore platform steel structures, including a sacrificial anode and a clamp, the clamp including a clamp body for clamping on a steel pipe of the offshore platform steel structure, the clamp body is connected to a conductive rod for establishing an electrical connection between the clamp and the steel pipe, and the clamp body is provided with a terminal block; the terminal block is electrically connected to a plurality of the sacrificial anodes through a cable, and is characterized in that a rope clamp plate for clamping the cable is connected to the clamp body.

[0006] Compared with related technologies, the life extension system of the cathodic protection of the steel structure of the offshore platform has the following advantages: a terminal block is arranged on the clamp, so that the clamp can be connected to more sacrificial anodes through cables, so as to obtain a longer life extension effect, and the sacrificial anode can be sunk to the seabed at a certain distance from the steel pipe of the steel structure of the offshore platform, so as to avoid excessive load on the steel structure of the offshore platform and affect the stability of the steel structure of the offshore platform; and a rope clamp plate for clamping the cable is connected to the clamp body to prevent the cable from being disconnected from the terminal block during construction or driven by ocean currents for a long time, so as to avoid the sacrificial anode from being disconnected from the steel structure of the offshore platform and causing the cathodic protection to fail.

[0007] Preferably, the rope clamping plate is mounted on the angle steel at the upper outer side of the clamping arm portion through two or three sets of stud nut assemblies, and the cable is clamped between the rope clamping plate and the angle steel, so as to prevent the fixing of the cable from affecting the rotation operation of the rotating plate connected to the lower part of the clamping arm portion.

[0008] As an improvement, the plurality of sacrificial anodes are connected in parallel to form a hollow frame, and two cables are connected between the hollow frame and the terminal block. Ocean currents can flow through the hollow frame, making it difficult for the sacrificial anodes to be swept away by the ocean currents, thereby causing the cathodic protection of the offshore platform to fail; the two cables are used to reduce the possibility of electrical connection failure.

[0009] As an improvement, a rotating plate is rotatably connected to the lower part of the clamp body arm portion and supports the steel pipe to fix the clamp to the steel pipe. A tension spring in a stretched state is connected to the bottom end of the outer side of the rotating plate, and the other end of the tension spring is connected to the connecting rod in the middle part of the clamp arm portion on the same side. The tension of the tension spring is used to restore the position of the rotating plate to keep the steel pipe fixed.

[0010] As an improvement, the conductive rod is a spiral thimble screwed onto the top plate of the fixture body and deviated from the center position, and the bottom end of the spiral thimble is a cone that can easily penetrate the anti-corrosion layer of the steel pipe during screwing in. The conical bottom end of the spiral thimble can better penetrate the anti-corrosion layer of the steel pipe, and the oblique guidance of the cone of the spiral thimble head deviating from the center position can avoid serious damage to the steel pipe of the offshore platform steel structure during the screwing in process. Only one is needed to ensure the stability of the electrical connection with the steel pipe; when the spiral thimble is not screwed in enough when facing the center position, it is easy to cause unstable electrical connection. When the screwing in depth is too large, although the electrical connection is stable, it will squeeze or damage the steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional schematic diagram of an offshore platform steel structure equipped with the cathodic protection life extension system of the present application.

[0012] Figure 2 yes Figure 1 Enlarged schematic diagram of part A.

[0013] Figure 3It is a three-dimensional schematic diagram of the clamp connecting two cables and fixing them with a steel pipe clamp according to the present application.

[0014] Figure 4 yes Figure 1 Schematic diagram of the enlarged portion B.

[0015] Figure 5 It is a three-dimensional schematic diagram of a clamp for connecting a cable and fixing it with a steel pipe clamp according to the present application.

[0016] Figure 6 It is a three-dimensional schematic diagram of the clamp of the present application.

[0017] Description of reference numerals:

[0018] 1. Clamp, 1-1. Clamp body, 1-2. Rotating plate, 1-3. Tension spring, 1-4. Screw thimble, 1-5. Terminal block, 1-6. Rope clamp plate, 1-7. Stop rod, 2. Sacrificial anode, 3. Cable, 100. Offshore platform steel structure, 101. Steel pipe. DETAILED DESCRIPTION

[0019] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0020] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] The preferred embodiment is as follows Figures 1 to 5 The life extension system for cathodic protection of offshore platform steel structure shown in the figure comprises a fixture 1 and a sacrificial anode 2. The sacrificial anode 2 is provided in multiple numbers and sunk to the seabed. The sacrificial anode 2 is connected in parallel or in series and is electrically connected to the fixture 1 installed on the steel pipe 101 of the offshore platform steel structure 100 at a distance through the cable 3. Figure 2 As shown, the plurality of sacrificial anodes 2 connected in parallel form a hollow frame, and the hollow frame is electrically connected to the fixture 1 through two cables 3, which can reduce the possibility of electrical connection failure; Figure 4 As shown, the plurality of sacrificial anodes 2 connected in series form a long chain, and the long chain is electrically connected to the fixture 1 via a cable 3 .

[0022] In this embodiment, the clamp 1 is as follows Figure 3 , 5As shown in Figure 6, it includes a clamp body 1-1 for clamping on the steel pipe 101. The clamp body 1-1 is roughly n-shaped, with an opening at the bottom and the lower parts of the clamp arms on both sides spread outward. The clamp body 1-1 is made of two n-shaped stainless steel plates welded by multiple angle steels. A flat plate is provided on the top of the clamp body 1-1. The outside of the clamp body 1-1 is coated with an anti-corrosion coating. The lower parts of the clamp arms on both sides of the clamp body 1-1 are rotatably connected to a rotating plate 1-2. The inner end of the rotating plate 1-2 is used to support the steel pipe 101 to fix the clamp 1 to the steel pipe 101. A stopper 1 is provided on the inner side of the lower part of the clamp arm to limit the inner end of the rotating plate 1-2 from continuing to rotate downward. -7, the top plate of the clamp body 1-1 is connected with a conductive rod for establishing an electrical connection with the steel pipe 101, the clamp body 1-1 is also provided with a terminal block 1-5, the terminal block 1-5 is provided with three cable slots, the terminal block 1-5 is electrically connected to the conductive rod through the steel plates on both sides of the clamp body 1-1 and the top plate, the terminal block 1-5 is connected to the outer corner of the top of the clamp body 1-1, and the cable slot of the terminal block 1-5 is used to connect the cable 3 electrically connected to multiple sacrificial anodes 2 connected in series or in parallel, and finally the steel pipe 101 is electrically connected to the sacrificial anode 2, forming a life extension system for cathodic protection of offshore platform steel structures. In this embodiment, the clamp body 1-1 is connected with a rope clamping plate 1-6 for clamping the cable 3, the rope clamping plate 1-6 is installed on the angle steel on the upper outer side of the clamp arm through three sets of stud nut assemblies, and the cable 3 is clamped between the rope clamping plate 1-6 and the angle steel.

[0023] In this embodiment, a tension spring 1-3 in a stretched state is connected to the bottom outer end of the rotating plate 1-2, and the other end of the tension spring 1-3 is connected to a connecting rod in the middle of the clamping arm portion on the same side.

[0024] In this embodiment, the conductive rod is a spiral pin 1-4 which is screwed on the top plate of the clamp body 1-1 and slightly deviates from the center position and can easily penetrate the anti-corrosion layer of the steel pipe 101 during rotation. The bottom cone of the spiral pin 1-4 is relatively sharp, but does not directly pierce the steel pipe, and will not cause excessive damage to the steel pipe 101 during the screwing process.

Claims

1. A life extension system for cathodic protection of offshore platform steel structures, comprising a sacrificial anode and a clamp, wherein the clamp comprises a clamp body for clamping on a steel pipe of an offshore platform steel structure, the clamp body is connected with a conductive rod for establishing an electrical connection between the clamp and the steel pipe, and the clamp body is provided with a wiring seat; the wiring seat is electrically connected to a plurality of the sacrificial anodes through a cable, characterized in that: The clamp body is connected with a rope clamping plate for clamping the cable.

2. The life extension system for cathodic protection of offshore platform steel structures according to claim 1, characterized in that: The rope clamping plate is installed on the angle steel at the upper outer side of the clamping arm portion through two or three groups of stud nut assemblies, and the cable is clamped between the rope clamping plate and the angle steel.

3. The life extension system for cathodic protection of offshore platform steel structures according to claim 1 or 2, characterized in that: A plurality of sacrificial anodes are connected in parallel to form a hollow frame, and two cables are connected between the hollow frame and the wiring seat.

4. The life extension system for cathodic protection of offshore platform steel structures according to claim 1, characterized in that: A tension spring in a stretched state is connected to the outer bottom end of a rotating plate which is rotatably connected to the lower part of the clamp body arm part and supports the steel pipe to fix the clamp to the steel pipe. The other end of the tension spring is connected to a connecting rod in the middle part of the same side arm part.

5. The life extension system for cathodic protection of offshore platform steel structures according to claim 1, characterized in that: The conductive rod is a spiral thimble which is screwed on the top flat plate of the clamp body and deviates from the center position. The bottom end of the spiral thimble is a cone which can easily penetrate the anti-corrosion layer of the steel pipe during screwing.

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