ASME B31.1
Power Piping, ASME Code for Pressure Piping, B31
Published by American Society of Mechanical Engineers (ASME)
The CFR incorporates ASME B31.1 by reference, which makes the edition it names part of the regulation. The CFR requires the edition it names, which may not be the newest. To enforce any other edition, the agency must publish the change in the Federal Register.
The 2 editions the CFR requires
Different parts name different editions; each applies where its part says so. Newest first.
ASME B31.1-2016, issued June 30, 2016
As the CFR lists it: “ASME B31.1-2016, Power Piping, ASME Code for Pressure Piping, B31, issued June 30, 2016 (“ASME B31.1”)”
- Listed in 46 CFR 56.01-2(b)(22); required by46 CFR 56.01-3 ↗46 CFR 56.01-5 ↗46 CFR 56.07-5 ↗46 CFR 56.07-10 ↗46 CFR 56.10-1 ↗46 CFR 56.10-5 ↗46 CFR 56.15-1 ↗46 CFR 56.25-7 ↗46 CFR 56.30-1 ↗46 CFR 56.30-5 ↗46 CFR 56.30-20 ↗46 CFR 56.35-1 ↗46 CFR 56.50-1 ↗46 CFR 56.50-40 ↗46 CFR 56.50-70 ↗46 CFR 56.50-97 ↗46 CFR 56.60-1 ↗46 CFR 56.65-1 ↗46 CFR 56.70-5 ↗46 CFR 56.70-10 ↗46 CFR 56.70-15 ↗46 CFR 56.80-5 ↗46 CFR 56.80-15 ↗46 CFR 56.85-10 ↗46 CFR 56.85-15 ↗46 CFR 56.95-1 ↗46 CFR 56.95-10 ↗46 CFR 56.97-1 ↗
ANSI B31.1-1986
As the CFR lists it: “B 31.1-1986, Code for Pressure Piping, Power Piping”
- Listed in 46 CFR 114.600(d)(2); required by46 CFR 119.715 ↗
- Listed in 46 CFR 125.180(c)(1); required by46 CFR 128.240 ↗
- Listed in 46 CFR 175.600(d)(2); required by46 CFR 182.710 ↗
Listed as: “B 31.1-1986, Code for Pressure Piping, Power Piping (“ANSI B 31.1.”)”
How to read it
- Where to get itASME codes and standards ↗
A free or purchased copy may not be the edition the CFR names; check it against the edition above. Every incorporated standard can also be inspected at the National Archives (NARA) and at the agency named in the section that lists it.
ASME B31.1 is copyrighted by its publisher; RegKnot shows its title and the editions the CFR names, not its text. Read from the eCFR's incorporation-by-reference sections, current as of October 26, 2026. The regulation text governs. All standards the CFR requires.