Failure Analysis of Natural Gas Pipeline

The failure reasons of a natural gas pipeline were studied by chemical analysis, mechanical property testing, microstructure analysis. And the macro-morphology and micro-morphology of the corroded steel pipe near the leak were investigated, and the corrosion products were also analyzed. The results show that the inner wall near the leak of the failure steel pipe was seriously corroded. And the failure model was pitting perforation, which resulted from the cooperation of chloride ions and microbes in medium environment.