ISO 21172-1
Gas cylinders—Welded steel pressure drums up to 3000 litres capacity for the transport of gases—Design and construction—Part 1: Capacities up to 1000 litres
Published by International Organization for Standardization (ISO)
The CFR incorporates ISO 21172-1 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.
ISO 21172-1:2015/Amd 1:2018(E), First edition, 2015-04-01, Amendment 1,2018-11
As the CFR lists it: “ISO 21172-1:2015/Amd 1:2018(E), Gas cylinders—Welded steel pressure drums up to 3000 litres capacity for the transport of gases—Design and construction—Part 1: Capacities up to 1000 litres, First edition, 2015-04-01, Amendment 1,2018-11”
- Listed in 49 CFR 171.7(w)(89); required by49 CFR 178.71 ↗
ISO 21172-1:2015, First edition, 2015-04
As the CFR lists it: “ISO 21172-1:2015(E), Gas cylinders—Welded steel pressure drums up to 3,000 litres capacity for the transport of gases—Design and construction—Part 1: Capacities up to 1000 litres, First edition, 2015-04”
- Listed in 49 CFR 171.7(w)(88); required by49 CFR 178.71 ↗
How to read it
- Where to get itISO Store ↗
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.
ISO 21172-1 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.