Petroleum and natural gas industries -
Materials for use in H2S-containing
environments in oil and gas production -
Part 3: Cracking-resistant CRAs (corrosion
resistant alloys) and other alloys
(First revision)
(ISO 15156-3:2015, MOD)
This part of 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 H2S-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 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 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 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 ISO 15156 is applicable,
including permitted exclusions.
This part of ISO 15156 applies to the qualification and selection of materials for equipment designed and
constructed using load controlled design methods. For design utilizing strain-based design methods,
see ISO 15156-1:2015, Clause 5.
This part of ISO 15156 is not necessarily suitable for application to equipment used in refining or
downstream processes and equipment.
