长输油气管道阀室漏电治理研究

Research on Leakage Control of Valve Chamber in Long Oil and Gas Pipeline

阀室作为长距离油气管道的重要组成部分,在整个线路中起着举足轻重的作用,如分输、紧急关断、放空、反吹等。目前大部分阀室的阴极保护与主干线阴极保护共用一个阴保系统,然而阀室内的各类接地、绝缘失效和阀门防腐缺陷等问题极易造成阀室内阴保电流流失,使得阀室内埋地管线欠保护,漏电严重时会造成阀室上下游500 m左右管段管道阴保电位偏正。为解决油气干线阀室漏电问题,确保整个干线阴保正常运行,埋地管道阴极保护电位须在–1.2~–0.85 V保护值内。文章分析了大部分阀室漏电原因,并提出了治理方法,以期为相关人员提供参考。

As an important component of long-distance oil and gas pipelines,valve chambers play a crucial role in the entire pipeline,such as distribution,emergency shutdown,venting,backflushing,etc.At present,most valve chambers share the same cathodic protection system as the cathodic protection of the main line.However,various grounding,insulation failures,and valve anti-corrosion defects in the valve chamber can easily cause cathodic protection current loss,resulting in inadequate protection of buried pipelines in the valve chamber.Severe leakage can cause about 500 meters of pipeline upstream and downstream of the valve chamber,and the cathodic protection potential of the pipeline to be biased towards positive.To solve the problem of leakage in the valve chamber of oil and gas pipelines and ensure the normal operation of the entire pipeline cathodic protection,the cathodic protection potential of buried pipelines must be within the protection value of-1.2~-0.85 V.The article analyzes the causes of leakage in most valve chambers and proposes treatment methods in order to provide reference for relevant personnel.