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Sour or Not Sour? That Is the Question: A Review of The NACE “Sour Limit” – Evolution and Implications for Modern Oil & Gas Production

Picture for Sour or Not Sour? That Is the Question: A Review of The NACE “Sour Limit” – Evolution and Implications for Modern Oil & Gas Production
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Product Number: 51321-16626-SG
Author: Eric Caldwell/ Russell Kane/ Brian Chambers
Publication Date: 2021
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$20.00
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The use of 0.05 psi H2S partial pressure as the threshold determining when sulfide stress cracking (SSC) resistant materials are needed was codified in NACE MR 0175 (1975) nearly a half century ago and has served the industry well since implementation. The origins of this pressure are empirical and largely forgotten but there is significant history showing that it is a safe, conservative limit. As the oil and gas industry continues to innovate and mature, it is imperative to maintain knowledge of the basis of the sour limit and how it may be applied.

Key words: Corrosion science and technology, hydrogen sulfide, standardization.

The use of 0.05 psi H2S partial pressure as the threshold determining when sulfide stress cracking (SSC) resistant materials are needed was codified in NACE MR 0175 (1975) nearly a half century ago and has served the industry well since implementation. The origins of this pressure are empirical and largely forgotten but there is significant history showing that it is a safe, conservative limit. As the oil and gas industry continues to innovate and mature, it is imperative to maintain knowledge of the basis of the sour limit and how it may be applied.

Key words: Corrosion science and technology, hydrogen sulfide, standardization.

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Development Of The NACE “MR-01-75” And NACE “TM-01-77” Standards: Part II – Accelerated Material Qualification Testing In Sour Environments At Near Atmospheric Pressure

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This paper is Part II of a two-part series intended to narrate the history, some of which has been forgotten over time, leading up to the publication of the first Material Requirement (MR-01-75) standard prepared by NACE and its subsequent auxiliary standards. Previously, Part I1 described the field observations and discussed the metallurgical factors that were being investigated by the historical NACE T-1B and 1F committees to support the development a “harmonized” sour service materials standard. In Part II, we focus on the rationale behind the use of accelerated laboratory test procedures and their development to differentiate metallurgical behavior in sour environments.
Picture for Development Of The NACE “MR-01-75” And NACE “TM-01-77” Standards: Part I – Field Observations And Metallurgical Factors
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Development Of The NACE “MR-01-75” And NACE “TM-01-77” Standards: Part I – Field Observations And Metallurgical Factors

Product Number: 51322-17525-SG
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Publication Date: 2022
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This is Part I of a two-part series intended to provide background and a rational justification or supporting rationale for requirements leading to the development and publication of NACE(1) MR 0175 and ISO(2) 15156. Part I focuses on some of the metallurgical and processing requirements; specifically, Rockwell C 22 scale (HRC) limit, the various acceptable heat treatments and the 1wt% Ni limit for carbon and low alloy steels to minimize the threat of sulfide stress cracking (SSC) in H2S containing environments. Part II describes the testing and rationale behind the use of accelerated laboratory test procedures and their development to differentiate metallurgical behavior in sour environments.
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00156 MATERIALS OPTIMISATION FOR OIL AND GAS SOUR PRODUCTION

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