Hydrogen Piping and PipelinesÂ
Material performance factors have been included to account for the adverse effects of hydrogen gas on the mechanical
properties of carbon and low alloy steels operating within the hydrogen embrittlement range. Many materials included in
ASME B31.3 have been omitted from ASME B31.12 tables due to their unsuitability for hydrogen service.
Rules have been added for conversion or retrofit of existing pipeline and distribution systems from natural gas or petroleum to hydrogen
service. Parts covering commercial, residential, and nonmetallic systems will be added in future editions. Material perfor-
mance factors will be reevaluated as materials research data are developed and understanding of hydrogen embrit-
tlement of carbon and low alloy steels increases
Â
Â