南干线四川气田榕佛段外腐蚀调查总结

Summary of Study on Corrosion of Rongfu Section of The Southern Main Pipeline of Sichuan Gas Field

德国人做的四川气田南干线榕佛段智能清管检测报告揭出令人震惊的事实 :在原以为阴极保护状况良好的管线上 ,发生了严重的外腐蚀 ,甚至穿孔。南干线的教训说明 :以往的阴极保护在许多关键的概念上存在误区 ,外腐蚀调查的结果表明 ,在设计及运行管理中选择性能优异的防腐层、采用断电法来正确判定管道是否处于真正的保护状态是至关重要的。

An intelligent pigging detection report on the Rongfu section of the southern main pipeline of Sichuan Gas Field,provided by the German,disclosed an amazing fact:severe external corrosion,even perforations have occurred in the pipelines which were considered to be under good cathodic protection.The fact indicates that there are mistakes in many former critical concepts of cathodic protection.This report shows that in design and operation management it is very important to select corrosion preventing coats with good property and to determine by the method of power fail interrupt that the pipelines are truely under protection.