CN-122013194-A - Electric connection method for cathodic protection of underwater steel structure

Abstract

The invention discloses an electric connection method for the cathodic protection of an underwater steel structure, which comprises the steps of welding a rib plate on a first steel structure, moving the first steel structure to be abutted against a second steel structure, connecting a nut on the rib plate, screwing a bolt on the nut, rotating the bolt to enable the bolt to rotate along the nut, screwing the bolt into the second steel structure, so that the first steel structure and the second steel structure are electrically connected, and checking and testing the whole connection area to ensure that the resistance value is smaller than 0.1 omega. The electric connection method for the cathode protection of the underwater steel structure avoids the complexity and high risk of the traditional underwater welding jumper wire, improves the construction efficiency and safety, ensures the uniform distribution of protection current on the underwater steel structure, improves the reliability of a cathode protection system, is suitable for various underwater steel structures such as ocean platforms, jackets, underwater pipelines and equipment, and the like, and realizes the electric connection of a new structure and an underwater original structure.

Inventors

• ZHANG GUOQING
• ZHU TAO
• XIONG RUI
• WU GUOQIANG
• LIU LI
• Jia Luna
• WANG HONGFU
• QI JIANGTAO
• ZHOU YINGCHUN
• XU HUI

Assignees

• 海洋石油工程股份有限公司

Dates

Publication Date

20260512

Application Date

20260202

Claims (9)

1. 1. The electric connection method for the cathodic protection of the underwater steel structure is characterized by mainly comprising the following steps of: s1, connecting a rib plate on a first steel structure, and moving the first steel structure to be abutted with a second steel structure; S2, connecting nuts on the rib plates, and screwing bolts on the nuts; S3, rotating the bolt to enable the bolt to rotate along the nut, and screwing the bolt into the second steel structure to enable the first steel structure and the second steel structure to form electric connection; S4, checking and testing the whole connection area to ensure that the resistance value is smaller than 0.1 omega.
2. 2. The electrical connection method for cathodic protection of an underwater steel structure of claim 1 wherein in S1, the rib is vertically connected to the side of the first steel structure remote from the second steel structure.
3. 3. The method of claim 1, wherein in S2, the first steel structure is provided with an opening, and the nut is welded to the first steel structure along the opening.
4. 4. The electrical connection method for cathodic protection of an underwater steel structure according to claim 1 wherein in S3 the end of the bolt is provided with a cross-cut so that the bolt is inserted into the second steel structure by the cross-cut.
5. 5. A method of cathodic protection of an underwater steel structure as claimed in claim 3 wherein the nut is a hex head nut.
6. 6. The electrical connection method for cathodic protection of an underwater steel structure of claim 4 wherein the bolts are hex head bolts.
7. 7. The electrical connection method for cathodic protection of an underwater steel structure of claim 1 wherein both the nut and bolt surfaces are coated with PTFE coating.
8. 8. The electrical connection method for cathodic protection of an underwater steel structure of claim 7 wherein a washer is provided between the nut and the bolt so that the bolt abuts against the nut through the washer.
9. 9. The electrical connection method for cathodic protection of an underwater steel structure according to claim 7 wherein the PTFE coated bolt is threaded through the first steel structure and into the preformed hole of the second steel structure, followed by the use of a PTFE coated carbon steel lock nut.

Description

Electric connection method for cathodic protection of underwater steel structure Technical Field The invention belongs to the field of offshore oil engineering, and particularly relates to an electrical connection method for cathodic protection of an underwater steel structure. Background Ocean platforms and underwater structures are used as important infrastructure for offshore oil and gas transportation, are in a severe environment with high salinity and high humidity for a long time, and are extremely easy to be corroded and eroded. Conventional cathodic protection methods rely on good electrical continuity to ensure efficient delivery of protection current. However, it has been a technical challenge to ensure electrical continuity between the various sections of the steel structure during installation and maintenance of the underwater steel structure. The traditional method is realized by welding the jumper wires underwater, but the method has the defects of high technical difficulty, high cost and potential safety hazard, and is particularly used in a deep sea environment. Therefore, there is a need to design an electrical connection method for cathodic protection of underwater steel structures, which solves the above-mentioned problems. Disclosure of Invention The invention aims to provide an electric connection method for the cathodic protection of an underwater steel structure, which has the advantages of uniformly distributing protection current and effectively prolonging the service life of the underwater steel structure, solves the problems of complexity and high risk of underwater welding jumper wires in the background technology, and is convenient for later reconstruction and maintenance. In order to achieve the above purpose, the specific technical scheme of the electrical connection method for the cathodic protection of the underwater steel structure is as follows: an electrical connection method for cathodic protection of an underwater steel structure mainly comprises the following steps: s1, connecting a rib plate on a first steel structure, and moving the first steel structure to be abutted with a second steel structure; S2, connecting nuts on the rib plates, and screwing bolts on the nuts; S3, rotating the bolt to enable the bolt to rotate along the nut, and screwing the bolt into the second steel structure to enable the first steel structure and the second steel structure to form electric connection; S4, checking and testing the whole connection area to ensure that the resistance value is smaller than 0.1 omega. Further, in S1, the rib plate is vertically connected to a side of the first steel structure away from the second steel structure. Further, in S2, an opening is provided in the first steel structure, and the nut is welded to the first steel structure along the opening. Further, in S3, the bolt end is provided with a cross-cut so that the bolt is inserted into the second steel structure by the cross-cut. Further, the nut is a hex head nut. Further, the bolt is a hexagon head bolt. Further, both the nut and bolt surfaces are coated with PTFE coating. Further, a spacer is provided between the nut and the bolt so that the bolt abuts against the nut through the spacer. Further, a PTFE coated bolt is threaded through the first steel structure and into a preformed hole in the second steel structure, followed by a PTFE coated carbon steel lock nut. The electric connection method for the cathodic protection of the underwater steel structure has the following advantages: (1) The invention avoids the complexity and high risk of the traditional underwater welding jumper wire, improves the construction efficiency and the safety, ensures the uniform distribution of the protection current on the underwater steel structure, and improves the reliability of the cathode protection system. (2) The invention optimizes the electric connection process, facilitates the later reconstruction and maintenance work, is suitable for various underwater steel structures, such as ocean platforms, jackets, underwater pipelines and the like, and has wide application prospect. Drawings FIG. 1 is a schematic diagram of the connection of a first steel structure and a second steel structure in the method for cathodic protection of an underwater steel structure according to the present invention; FIG. 2 is a schematic diagram of the connection of nuts and bolts in the electrical connection method of the cathodic protection of the underwater steel structure of the present invention; FIG. 3 is a schematic diagram of the overall structure of the electrical connection method for cathodic protection of an underwater steel structure according to the present invention; fig. 4 is a schematic overall structure of embodiment 2 of the present invention. The figure indicates: 1. The steel structure comprises a first steel structure, a second steel structure, a rib plate, a nut, a bolt, a cross tip, a grounding joint, a stud, a fla