Recommended practice for carbon steel sour-service piping components. Final report
It is widely recognized that H{sub 2}S corrosion that occurs in wet sour oil, gas and multi-phase piping systems can lead to various types of damage in line pipe, fittings, and flanges. The types of damage include general corrosion, pitting corrosion, hydrogen blistering (HB), hydrogen-induced cracking (HIC), stress-oriented hydrogen-induced cracking (SOHIC) and sulfide-stress cracking (SSC). These various types of hydrogen damage are defined in this report and their characteristics are discussed. In spite of several decades of investigation and committee activity, industry standards still do not adequately address the specification of line pipe, fittings or flanges for use in sour-service pipelines. The gaps in industry standards may exist because there are unresolved issues relating to what specific steps are absolutely necessary to achieve safe and economic operation of sour-service pipelines, or gaps may result from the lack of advocates for greater standardization. Also, pipelines are exposed to various concentrations of H{sub 2}S, which can lead to different specification requirements. In spite of unresolved technical issues, sour-service pipelines have been and continue to be constructed in which pipeline components and construction practices are being specified with project-specific or company-specific documents that address the gaps in existing industry standards. This report addresses the characteristics of line pipe, fittings and flanges that are related to their resistance or susceptibility to the various forms of hydrogen damage when exposed to wet sour fluids. Specifications for piping components to be exposed to wet sour fluids should include requirements and acceptance criteria for these characteristics. The resistance and susceptibility of carbon and low-alloy steels to general corrosion and pitting corrosion are generally not influenced by the factors that influence the various forms of hydrogen damage.
- Research Organization:
- Metallurgical Consultants, Inc., Houston, TX (United States)
- Sponsoring Organization:
- American Gas Association, Inc., Arlington, VA (United States)
- OSTI ID:
- 325708
- Report Number(s):
- AGA-99001941; CNN: Contract PR-252-9605; TRN: AHC29910%%16
- Resource Relation:
- Other Information: PBD: 31 Oct 1998
- Country of Publication:
- United States
- Language:
- English
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