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MR0175 is a NACE Materials Requirement that became an industry standard for Christmas Tree Valves in 1975. NACE altered MR0175 in 1978 to include other types of oil and gas production and completion equipment. Failures drove the early work and a disaster drove the 1978 version’s development and the haste that NACE used to finish and publish the 1978 document. The paper traces events and documents that predate MR0175 and that the oil and gas industry used to develop and write MR0175. The paper will discuss some of the circumstances that led to MR0175’s format, wording and ambiguities. The paper attempts to convey what ideas the writers were trying to express. The paper discusses the portion of the industry and the types of equipment that MR0175 addressed – the philosophy scope. The paper takes up the original intent behind MR0175 and follows its application into other areas that MR0175 did not envision. The paper covers some of the current changes that are being made to MR0175. NACE Unit Committee TlF is also working on a major possible revision in how MR0175 speaks to CRAs (Corrosion Resistant Alloys); the paper summarizes those possibilities. The paper attempts to differentiate between what MR0175 addresses and what the International Standards Organization (ISO) sour gas document is addressing through ISO/TC67/WG7.
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.
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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.
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.