Analysis of Cracking Reasons for Flange Welding Joints in a Certain Dry Gas Line
During the start-up of a hydrocracking unit,the flange welding joint of the dry gas pipeline cracked.This article analyzed and studied the causes of pipeline leakage through methods such as macroscopic inspection,metallographic examination,hardness testing,and chemical composition analysis.The results indicate that the chemical composition of the pipeline flange does not conform to the requirements of design standard,and stress corrosion cracking occurred in a low-temperature wet hydrogen sulfide environment.
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