Special permit number markings and shipping papers
Pipeline and Hazardous Materials Safety Administration · Jul 9, 2008 · Reference No. 08-0106
Interprets: 49 CFR § 173.23
Reggie’s quick take
Someone asked whether a special permit number marked on a cargo tank must also appear on the shipping paper. PHMSA says yes. Unless the special permit says otherwise or § 173.23 applies, the shipping paper must show "DOT-SP" followed by the permit number, placed so it clearly goes with the matching description (see § 172.203(a)).
Written by AI (Claude) on Oct 22, 2026. Robots make mistakes and leave things out, so the letter below is what counts. Not legal advice.
This responds to your letter dated April 8, 2008, concerning requirements in the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to special permits. Specifically, you ask if a special permit number (e.g., SP12930) that is marked on a cargo tank must also be entered on a shipping paper.
The answer is yes. Unless otherwise specified in the special permit or except as provided in §173.23, each shipping paper issued in connection with a shipment made under a special permit must bear the notation "DOT-SP" followed by the special permit number assigned and located so that the notation is clearly associated with the description to which the special permit applies (See §172.203(a)).
A letter of interpretation applies the regulations to the facts the requester described. It isn’t a regulation and isn’t legal advice. The agency’s copy.