某集输管线穿孔失效原因分析及对策

Cause Analysis and Countermeasure of Perforation Failure of a Gathering and Transportation Pipeline

摘要: 某含硫集输管线发生穿孔失效，对站场正常生产造成影响，通过化学成分检测、力学性能测试、非金属夹杂物评级、腐蚀产物分析、焊缝检测等方法对其失效原因进行分析，结果表明：此段管线服役条件下，电化学与冲刷腐蚀共同作用相互促进，是一种自带催化效应的严重腐蚀，两者相互协同作用远大于作用之和，再加上此段焊缝本身存在气孔缺陷以及流体中的腐蚀介质性质进一步加速了腐蚀穿孔。根据造成腐蚀穿孔的原因，提出了具体对策。

Abstract: The perforation failure of a sulfur-containing gathering and transportation pipeline has affected the normal production of the station. Through chemical composition test, mechanical property test, non-metallic inclusion rating, corrosion product analysis, weld inspection and other methods to an-alyze the failure reasons, the results show that: Under the service condition of this section of pipe-line, electrochemical and scour corrosion act together to promote each other, which is a serious corrosion with catalytic effect. Their synergistic effect is far greater than the sum of their effects. In addition, the porosity defects in this section of weld and the nature of corrosive medium in the fluid further accelerate the corrosion perforation. According to the causes of corrosion perforation, the countermeasures are put forward.