GB/T 20972.3-2008 Petroleum and natural gas industries—Material for use in H2S-containing environments in oil and gas production—Part 3:Cracking-resistant CRAs(corrosion-resistant alloys)and other alloys
GB/T 20972.3-2008 Petroleum and natural gas industries—Material for use in H2S-containing environments in oil and gas production—Part 3:Cracking-resistant CRAs(corrosion-resistant alloys)and other alloys
Basic Information
Scope
This part of GB/T 20972 provides requirements and recommended practices for the selection and evaluation of corrosion-resistant alloys (CRA) and other alloys used in equipment in hydrogen sulfide (H2S)-containing environments in oil and gas extraction and natural gas processing plants. The failure of such equipment can pose risks to public safety, personal health, and the environment. Applying this part can help prevent costly corrosion damage to equipment. This part supplements appropriate design specifications, standards, and guidelines, but does not replace their material requirements. This part describes the performance of these materials against damage caused by sulfide stress cracking (SSC), stress corrosion cracking (SCC), and galvanic hydrogen stress cracking (GHSC). This part only addresses cracking and does not cover material loss due to uniform corrosion (mass reduction) or localized corrosion. Table 1 lists a non-exhaustive list of equipment applicable to this part and allowable exceptions. This part applies to the selection and evaluation of materials used in equipment designed and manufactured according to conventional elasticity criteria. For designs using plasticity criteria (e.g., based on strain and limit state design), refer to the requirements of Chapter 5 of GB/T 20972.1—2007. This part may not necessarily apply to refining or downstream processing equipment.