Failure analysis of PSV spring in off shore gas production pipeline

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• 作者：S.S.M. Tavares^a ; ^{ssmtavares@terra.com.br} ; V. Anchieta^a ; E.R.C. Leã ; o^b ; M.R. da Silva^c ; M.C.S. Macê ; do^d
• 关键词：Environmentally-assisted cracking ; Hydrogen embrittlement
• 刊名：Engineering Failure Analysis
• 出版年：2012
• 期刊代码：53_13506307
• 类别：et
• 出版时间：July, 2012
• 卷：23
• 期：Complete
• 页码：10-17
• 文件大小：1626 K

摘要

Pressure safety valves (PSVs) are often used to protect pipes, valves and pressure vessels in industrial plants. In off shore oil and gas production and storing platforms these equipments are subjected to aggressive environmental conditions. High chloride atmosphere and the possibility of H₂S contamination are the main concerns about the equipments operation. In this work, the failure of a small spring from a PSV used in gas production line in an off shore platform was investigated. The material was identified as UNS S17700 precipitation hardening stainless steel heat treated to the peak of hardness. The analysis of surface of fracture revealed that the material has failed due an environment assisted cracking, facilitated by the low ductility of the material.