{"operation":"document","citation":"49 CFR 179.201-5","title":"-5 Postweld heat treatment and corrosion resistance.","source_type":"regulation","agency":"Pipeline and Hazardous Materials Safety Administration","status":"current","official":true,"published_on":null,"effective_on":"2026-08-18","summary":"(a) Tanks and attachments welded directly thereto must be postweld heat treated as a unit at the proper temperature except as indicated below. Tanks and attachments welded directly thereto fabricated from ASTM A 240/A 240M (IBR, see § 171.7 of this subchapter) Type 430A, Type 304 and Type 316 materi","machine_formats":{"json":"https://regulus.evalyn.ai/document/49-cfr-179-201-5.json","markdown":"https://regulus.evalyn.ai/document/49-cfr-179-201-5.md"},"app_url":"https://regulus.evalyn.ai/document/49-cfr-179-201-5","source_url":"https://www.ecfr.gov/on/2026-08-18/title-49/section-179.201-5","body":"(a) Tanks and attachments welded directly thereto must be postweld heat treated as a unit at the proper temperature except as indicated below. Tanks and attachments welded directly thereto fabricated from ASTM A 240/A 240M (IBR, see § 171.7 of this subchapter) Type 430A, Type 304 and Type 316 materials must be postweld heat treated as a unit and must be tested to demonstrate that they possess the corrosion resistance specified in § 179.200-7(d), Footnote 2. Tanks and attachments welded directly thereto, fabricated from ASTM A 240/A 240M Type 304L or Type 316L materials are not required to be postweld heat treated.\n\n(b) Tanks and attachments welded directly thereto, fabricated from ASTM A 240/A 240M Type 304L and Type 316 materials must be tested to demonstrate that they possess the corrosion resistance specified in § 179.200-7(d), Footnote 2.\n\n[68 FR 75762, Dec. 31, 2003]","truncated":false,"body_characters":884}