The ASME B31.12 standard provides a list of materials (Annex 6.1) for hydrogen-compatible pipelines, with the condition of meeting other criteria in the standard specified later in the report. When using materials not listed for hydrogen service, tests mu

The ASME B31.12 standard provides a list of materials (Annex 6.1) for hydrogen-compatible piping, with the condition of meeting other criteria in the standard specified later in the report. When using materials not listed for hydrogen service, tests must be conducted to ensure compliance with ASME B31.12 requirements, including mechanical properties, pipe manufacturing process, heat treatment, and quality control. However, steel grades according to the European classification (EN) that are not considered by ASME B31.12 may not always require additional testing due to their good mechanical properties. Additionally, ASME B31.12 does not consider the effects of moisture or the presence of H2S in the gas.