Failures by SOHIC in Sour Hydrocarbon Service
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This article discusses two failures experienced in spiral-welded pipeline/piping due to stress-oriented hydrogen-induced cracking (SOHIC). The first identified SOHIC failure occurred in 1974, before the term SOHIC was coined. A second failure occurred in 1998 in the piping system handling aggressive sour natural gas liquid (NGL) service. The conditions leading to SOHIC failures and differences between the two failures are discussed. The influence of these failures on company standards is covered.
KeywordsStress-oriented hydrogen-induced cracking Sour service H2S Elemental sulfur Spiral-submerged arc welded pipe Longitudinal-submerged arc welded pipe
The authors would like to acknowledge Schuler Cox for his extensive involvement in the failure analysis during his employment with Saudi Aramco. We thank the Ministry of Petroleum and Minerals and Saudi Aramco management for permission to publish this article.
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