{"operation":"document","citation":"49 CFR 178.255-2","title":"-2 Material.","source_type":"regulation","agency":"Pipeline and Hazardous Materials Safety Administration","status":"current","official":true,"published_on":null,"effective_on":"2026-08-18","summary":"(a) Material used in the tank must be steel of good weldable quality and conform with the requirements in Sections V, VIII, and IX of the ASME Code (IBR, see § 171.7 of this subchapter).\n\n(b) The minimum thickness of metal, exclusive of lining material, for shell and heads of tanks shall be as follo","machine_formats":{"json":"https://regulus.evalyn.ai/document/49-cfr-178-255-2.json","markdown":"https://regulus.evalyn.ai/document/49-cfr-178-255-2.md"},"app_url":"https://regulus.evalyn.ai/document/49-cfr-178-255-2","source_url":"https://www.ecfr.gov/on/2026-08-18/title-49/section-178.255-2","body":"(a) Material used in the tank must be steel of good weldable quality and conform with the requirements in Sections V, VIII, and IX of the ASME Code (IBR, see § 171.7 of this subchapter).\n\n(b) The minimum thickness of metal, exclusive of lining material, for shell and heads of tanks shall be as follows:\n\nTank capacity Minimum thickness (inch) Not more than 1,200 gallons 1⁄4 Over 1,200 to 1,800 gallons 5⁄16 Over 1,800 gallons 3⁄8\n\n[29 FR 18972, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 178-7, 34 FR 18250, Nov. 14, 1969; 68 FR 75750, Dec. 31, 2003]","truncated":false,"body_characters":587}