US lawFederal (United States)RegulationsTitle 49 CFR — TransportationChapter I — PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATIONPart 179 — SPECIFICATIONS FOR TANK CARSSubpart D — Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW)179.200-1149 C.F.R. § 179.200-11Postweld heat treatment.Last amended: 2016Year: 2026Length: 40 wordsOfficial source Cite as 49 C.F.R. § 179.200-11 (2026)When specified in § 179.201-1, after welding is complete, postweld heat treatment must be in compliance with the requirements of AAR Specifications for Tank Cars, appendix W (IBR, see § 171.7 of this subchapter). [68 FR 75761, Dec. 31, 2003]Cross-references to the CFR171.7179.201-1Previous49 C.F.R. § 179.200-10Next49 C.F.R. § 179.200-13