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This paper will discuss some of the reasons why some Owner/Operators are choosing to invoke NACE MR0175-20021 instead of NACE MR0175/ISO 15156. Examples of exceptions taken will be examined. And cost issues involved in meeting MR0175/ISO 15156 will be presented.
From 1975 to 2003, guidelines and latest industry practices to avoid sulfide stress cracking (SSC) in upstream H2S-containing services have been published in NACE Standard MR0175. Over those years, many changes have been made to the standard, culminating in its evolution to NACE MR0175/ISO 15156 seven years ago. However, there have been difficulties for Owner/Operators in the application of this latest standard, and for vendors in meeting its requirements. As a result, there are those who are choosing to invoke NACE MR0175-20021, instead. This paper will discuss some of the reasons why this is so, including the effects of changes in the sour service definitions. Examples of exceptions taken will be examined. And cost issues involved in meeting MR0175/ISO 15156 will be presented. Keywords: sulfide stress corrosion cracking, sour service, NACE MR0175
This new standard is the result of a six-year effort by NACE, EFC and ISO/TC 67/WG 7. Background to the development of the new standard and a summary outlining its impact on materials selection for those familiar with previous documents.
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The process used to develop MR0103 is described, followed by a review of the requirements in the standard accompanied by highlights of the differences between MR0103 and the previous and current versions of MR0175.