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Sulfide stress corrosion cracking and hydrogen induced cracking of A216-WCC wellhead flow control valve body
, Article Case Studies in Engineering Failure Analysis ; Volume 1, Issue 3 , 2013 , Pages 223-234 ; 22132902 (ISSN) ; Kokabi, A. H ; Nasr Esfehani, M ; Sharif University of Technology
2013
Abstract
The wellhead flow control valve bodies which are the focal point of this failure case study were installed in some of the upstream facilities of Khangiran's sour gas wells. These valve bodies have been operating satisfactorily for 3 years in wet H2S environment before some pits and cracks were detected in all of them during the periodical technical inspections. One failed valve body was investigated by chemical and microstructural analytical techniques to find out the failure cause and provide preventive measures. The valve body alloy was A216-WCC cast carbon steel. During investigation many cracks were observed on the inner surface of the valve body grown from the surface pits. The results...
Failure analysis: Sulfide stress corrosion cracking and hydrogen-induced cracking of A216-WCC wellhead flow control valve body
, Article Journal of Failure Analysis and Prevention ; Vol. 14, issue. 3 , 2014 , p. 376-383 ; Kokabi A.H ; Mostowfi J ; Sharif University of Technology
Abstract
The wellhead flow control valve bodies which are the focal point of this failure case study were installed in some of the upstream facilities of Khangiran's sour gas wells. These valve bodies have been operating satisfactorily for 3 years in wet H2S environment before some pits and cracks were detected in all of them during the periodical technical inspections. One failed valve body was investigated by chemical and microstructural analytical techniques to find out the failure cause and provide preventive measures. The valve body alloy was A216-WCC cast carbon steel. During investigation many cracks were observed on the inner surface of the valve body grown from the surface pits. The results...