NACE MR 0175: Materials for use in H 2 S-containing environments

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Part 1 : General principles for selection of cracking-resistant materials

1 Scope
This part of ANSI/NACE MR 0175/ISO 1 51 56 describes general principles and gives requirements and recommendations for the selection and qualification of metallic materials for service in equipment used in oil and gas production and in natural-gas sweetening plants in H 2 S-containing environments, where the failure of such equipment can pose a risk to the health and safety of the public and personnel or to the environment. It can be applied to help to avoid costly corrosion damage to the equipment itself. It supplements, but does not replace, the materials requirements given in the appropriate design codes, standards or regulations.

This part of ANSI/NACE MR01 75/ISO 151 56 addresses all mechanisms of cracking that can be caused by H 2 S, including sulfide stress cracking, stress corrosion cracking, hydrogen-induced cracking and stepwise cracking, stress-oriented hydrogen-induced cracking, soft zone cracking and galvanically induced hydrogen stress cracking.

Table 1 provides a non-exhaustive list of equipment to which this part of ANSI/NACE MR01 75/ISO 15156 is applicable, including permitted exclusions.

This part of ANSI/NACE MR0175/ISO 151 56 applies to the qualification and selection of materials for equipment designed and constructed using conventional elastic design criteria.

This part of ANSI/NACE MR01 75/ISO 151 56 is not necessarily applicable to equipment used in refining or downstream processes and equipment.

Part 2: Cracking-resistant carbon and low-alloy steels, and the use of cast irons

1 Scope
This part of ANSI/NACE MR0175/ISO 15156 gives requirements and recommendations for the selection and qualification of carbon and low-alloy steels for service in equipment used in oil and natural gas production and natural gas treatment plants in H 2 S-containing environments, whose failure can pose a risk to the health and safety of the public and personnel or to the environment. It can be applied to help to avoid costly corrosion damage to the equipment itself. It supplements, but does not replace, the materials requirements of the appropriate design codes, standards or regulations.

This part of ANSI/NACE MR0175/ISO 15156 addresses the resistance of these steels to damage that can be caused by sulfide stress cracking (SSC) and the related phenomena of stress-oriented hydrogen-induced cracking (SOHIC) and soft-zone cracking (SZC).

This part of ANSI/NACE MR0175/ISO 15156 also addresses the resistance of these steels to hydrogen-induced cracking (HIC) and its possible development into stepwise cracking (SWC).

This part of ANSI/NACE MR0175/ISO 15156 is concerned only with cracking. Loss of material by general (mass loss) or localized corrosion is not addressed.

Table 1 provides a non-exhaustive list of equipment to which this part of ANSI/NACE MR0175/ISO 15156 is applicable, including permitted exclusions.

This part of ANSI/NACE MR0175/ISO 15156 applies to the qualification and selection of materials for equipment designed and constructed using conventional elastic design criteria. For designs utilizing plastic criteria (e.g. strain-based and limit-state designs), see ANSI/NACE MR0175/ISO 151 56-1:2009, Clause 5. Annex A lists SSC-resistant carbon and low alloy steels, and A.2.4 includes requirements for the use of cast irons.

This part of ANSI/NACE MR0175/ISO 15156 is not necessarily suitable for application to equipment used in refining or downstream processes and equipment.

 

Part 3: Cracking-resistant CRAs (corrosion- resistant alloys) and other alloys

1 Scope
This part of ANSI/NACE MR0175/ISO 15156 gives requirements and recommendations for the selection and qualification of CRAs (corrosion-resistant alloys) and other alloys for service in equipment used in oil and natural gas production and natural gas treatment plants in H 2 S-containing environments, whose failure can pose a risk to the health and safety of the public and personnel or to the environment. It can be applied to help to avoid costly corrosion damage to the equipment itself. It supplements, but does not replace, the materials requirements of the appropriate design codes, standards or regulations.

This part of ANSI/NACE MR0175/ISO 15156 addresses the resistance of these materials to damage that can be caused by sulfide stress cracking (SSC), stress corrosion cracking (SCC) and galvanically induced hydrogen stress cracking (GHSC).

This part of ANSI/NACE MR0175/ISO 15156 is concerned only with cracking. Loss of material by general (mass loss) or localized corrosion is not addressed.

Table 1 provides a non-exhaustive list of equipment to which this part of ANSI/NACE MR01 75/ISO 1 51 56 is applicable, including permitted exclusions.

This part of ANSI/NACE MR0175/ISO 15156 applies to the qualification and selection of materials for equipment designed and constructed using conventional elastic design criteria. For designs utilizing plastic criteria (e.g., strain-based and limit-state designs), see ANSI/NACE MR0175/ISO 15156-1 :2009, Clause 5.

This part of ANSI/NACE MR0175/ISO 15156 is not necessarily suitable for application to equipment used in refining or downstream processes and equipment.

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