Alkaline Carbonate SCC Failures at a Refinery
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A metallurgical evaluation was performed to investigate two failures from carbonate-containing sour water service at a refinery. The failure mechanism for both fractured components (a pipe and a heat exchanger tube) was alkaline carbonate stress corrosion cracking. Alkaline carbonate stress corrosion cracking is a mechanism that has become more widely recognized in refinery service. This paper details the visual, SEM/EDS, metallographic, and microhardness evaluations used to determine the failure mechanism for each refinery component.
KeywordsAlkaline carbonate stress corrosion cracking Stress corrosion cracking Carbonate Petroleum Refining
The authors would like to thank Stephen Davis, who was one of the principal investigators for the evaluation of the heat exchanger tube.
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