Federal Register #2026-15819

DOT Final Rule: 10-Year Requalification for Hazardous Materials Cylinders (DOT 3A/3AA)

The Department of Transportation's Pipeline and Hazardous Materials Safety Administration (PHMSA) has issued a final rule impacting the requalification of hazardous materials cylinders: - PHMSA adopts DOT special permit 14175 into regulation - Authorizes a 10-year requalification period for DOT 3A and 3AA cylinders - Applies to cylinders used for flammable and nonflammable, nonpoisonous gases - Permits the use of ultrasonic examination (UE) as a testing method, in addition to hydrostatic testing - No specific OEMs or vendors are named, but the rule affects all manufacturers and users of DOT 3A and 3AA cylinders - The rule preempts certain state, local, and tribal requirements regarding hazardous materials packaging and container testing - No procurement, purchase, or award is being announced; no products, part numbers, or quantities are requested

Description

This final rule adopts the provisions of DOT special permit 14175 to authorize a 10-year requalification period and ultrasonic examination testing for DOT specification 3A and 3AA cylinders used in flammable and nonflammable, nonpoisonous gas service. The rule aims to reduce regulatory burdens by reflecting advances in testing technology and reducing the frequency of cylinder requalification. It is effective September 3, 2026, and is part of the Hazardous Materials Regulations under the Department of Transportation's Pipeline and Hazardous Materials Safety Administration.

View original listing