49 CFR 180.402: Alternative qualification and maintenance.

Notwithstanding the applicability of § 180.401 (for ASME Code Section VIII, Division 1 cargo tanks) for the continuing qualification and maintenance of an authorized specification cargo tank motor vehicle, and subject to conditions and limitations set forth in § 173.252 of this subchapter, the NBIC (IBR, see § 171.7 of this subchapter)—

(a) Must be used for the continuing qualification, maintenance, and periodic testing (i.e., continued service) of cargo tanks constructed to ASME Code Section XII in accordance with § 178.301 of this subchapter; and

(b) May be used, in combination with the requirements of this part, for the continuing qualification, maintenance, and periodic testing (i.e., continued service) of cargo tank motor vehicles constructed to ASME Code Section VIII, Division 1. Specifically, DOT specification cargo tank motor vehicles constructed to ASME Section VIII, Division 1 that bear a “U” stamp may be inspected, repaired and tested under this subpart and the NBIC, excluding all supplements except Supplement 6.