Final rule · 2026-08053

Pipeline Safety: Standards Update-ASME B31.4

This DFR amends PHMSA's regulations to incorporate by reference an updated edition of industry standard ASME B31.4, Pipeline Transportation Systems for Liquids and Slurries: ASME Code for Pressure Piping, B31. This updated standard will maintain or improve public safety, prevent regulatory confusion, reduce compliance burdens on stakeholders, and satisfy a mandate in the National Technology Transfer and Advancement Act (NTTAA) of 1995.