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Pipe transmission oriented cathode protection system

A cathodic protection and pipeline technology, applied in the field of electrochemical protection of pipelines, can solve the problems of affecting cathodic protection potential, pipeline interference, insufficient protection, etc., and achieve the effect of ensuring normal and effective operation and effective protection.

Inactive Publication Date: 2011-04-20
国家管网集团北京管道有限公司
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AI Technical Summary

Problems solved by technology

With the prolongation of time, the water absorption, aging and damage of the coating will affect the cathodic protection potential, causing the cathodic protection potential to drop, so that some buried pipelines and other facilities will be insufficiently protected
At the same time, it may also cause interference between different buried pipelines, affecting the effectiveness of the cathodic protection system
Due to the narrow space of oil and gas transportation stations and depots, the maintenance of pipelines and valves, and the construction of expansion and reconstruction projects will have a certain impact on the protection potential of the existing cathodic protection system. Conduct inspections to find insufficient protection or over-protection, but manual periodic inspections are difficult to detect these problems in time

Method used

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  • Pipe transmission oriented cathode protection system
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Embodiment Construction

[0028] The principle of cathodic protection can be used figure 1 The polarization curves are shown for explanation. Before the metal is energized and protected, the anode equilibrium potential of the corrosion micro-battery in the corrosive medium is Ea, e, and the equilibrium potential of the cathode is Ec, e. When the cathode and anode are short-circuited, the corrosion potential formed is Ecorr, and the corresponding corrosion current is I k . If a current is used for polarization, when the cathode polarization current reaches I 1 , the corrosion potential is reduced from Ecorr to E due to cathodic polarization 1 , at this time the corrosion current of the anode is determined by I k reduced to I 2 . If it is further polarized and the cathodic polarization current reaches Ip, the corrosion potential will continue to move negatively to be equal to the initial potential (open circuit potential) Ea, e of the anode, then the corrosion current will become zero, that is, the ...

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Abstract

The invention discloses a pipe transmission oriented cathode protection system which comprises a plurality of cathode protection potential sensors, a cathode protection potential receiving device and a computing and processing deivce, wherein the plurality of cathode protection potential sensors are respectively distributed at underground pipes and connected with the cathode protection potential receiving device through transmission cables, the cathode protection potential receiving device is connected with the computing and processing device, the computing and processing device operates cathode protection online detection software for detecting and evaluating cathode protection operation. The invention provide a whole set of technical solution about cathode protection potential detection, evaluation and data transmission and has significance for protecting the normal and effective operation of a system, realizing effective protection of cathode protection pipes in a gas station, preventing leakage accidents caused by corrosion and guaranteeing the safety of the gas station.

Description

technical field [0001] The invention relates to a cathodic protection system for long-distance transportation pipelines (long-distance transportation pipelines for short) facing the safety requirements of the pipeline transportation industry, and belongs to the technical field of pipeline electrochemical protection. Background technique [0002] As one of the five major modes of transportation, pipelines have a history of more than 100 years. At present, the total length of long-distance transmission pipelines in the world is more than 2 million kilometers. In developed countries, the pipeline transportation volume of crude oil accounts for 80% of the total transportation volume, and the pipeline transportation volume of natural gas accounts for 95% of the total transportation volume. Therefore, pipeline transportation plays a very important role in economic life and is known as the artery of the national economy. [0003] Corrosion is a key factor affecting the reliabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F13/06C23F13/04
Inventor 葛艾天王荣刘权刘卿
Owner 国家管网集团北京管道有限公司
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