In order to perform or witness the inspections and tests required by DOT, inspectors must be registered and possess a Cargo Tank (CT) registration number from the Federal Motor Carrier Safety Administration (FMCSA).
Considerations to obtaining “Registered Inspector” certification:
The CT number is assigned to facilities and / or individuals that manufacture, assemble, inspect, test, certify or perform welded repairs on cargo tanks or a cargo tank motor vehicle manufactured in accordance with a DOT specification or under the terms of a Special Permit.
You must submit a registration statement in accordance with 49 CFR § 107.503 to receive a CT number.
To do so, submit a Form MCS-150 to register for a USDOT number at the same time. If you already have a USDOT number, you can update that registration and add a CT number by completing the CT registration statement. Persons applying for a “CT” Number for the first time may use this link:
If you already have a USDOT number, you can update your existing registration and add a CT number by completing the CT registration statement. Persons with an existing USDOT number may use this link: