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205002 Failure analysis of a natural gas pipeline

Abstract:

A L390 natural gas pipeline exploded in 2011 in China. Macrofracture examination, thickness

measurement, chemical composition analysis, metallographic inspection, mechanical property testing, fracture scan electronic microscopy examination and environment analysis were conducted to the burst pipeline. The results showed that Stress Corrosion Cracking (SCC) generated in the mechanical damaged zone of the pipeline was the reason of the failure. This kind of cracking was induced by Cl and HCO3 in near neutral corrosive medium of pH value. The stress concentration was induced by the groove damage under inner pressure.

Authors:

Yafan Zhao a, Mingda Song b

a Shandong Jianzhu University, Jinan 250014, PR China

b Shandong Special Equipment Inspection Institute, Jinan 250013, PR China

Keywords:

Natural gas pipeline, SCC, Mechanical damage, Failure analysis

 

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