Official US Government Icon

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.

Secure Site Icon

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

The latest general information on the Coronavirus (COVID-19) is available on For PHMSA contact information during the COVID-19 health emergency, please visit our page.

United States Department of Transportation United States Department of Transportation

Pressure Vessels Overview

Pressure Vessel Canisters

Please click here for Pressure Vessels Workflow Reports.

Authorization of cylinders manufactured in Canada to be filled, used, and requalified in the United States

Federal Register / Vol.82, No. 60/ Thursday, March 30, 2017 / Rules and Regulations. PHMSA amended § 171.12 (a)(4) to authorize filling, maintenance, testing, and use of CTC, CRC, BTC, and TC cylinders that have a corresponding DOT specification cylinder as prescribed in the HMR. This authorization extends the recognition of cylinders manufactured in Canada to be filled, used and requalified..."

The International Harmonization Update will become effective JULY 12, 2017. United States RIN holders can begin submitting modification applications to have their approvals updated with the corresponding TC- cylinder specifications.

Please contact for any further questions.

Related Links

Last updated: Tuesday, January 28, 2020