{"operation":"document","citation":"49 CFR 179.500-3","title":"-3 Type and general requirements.","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 built under this specification shall be hollow forged or drawn in one piece. Forged tanks shall be machined inside and outside before ends are necked-down and, after necking-down, the ends shall be machined to size on the ends and outside diameter. Machining not necessary on inside or outs","machine_formats":{"json":"https://regulus.evalyn.ai/document/49-cfr-179-500-3.json","markdown":"https://regulus.evalyn.ai/document/49-cfr-179-500-3.md"},"app_url":"https://regulus.evalyn.ai/document/49-cfr-179-500-3","source_url":"https://www.ecfr.gov/on/2026-08-18/title-49/section-179.500-3","body":"(a) Tanks built under this specification shall be hollow forged or drawn in one piece. Forged tanks shall be machined inside and outside before ends are necked-down and, after necking-down, the ends shall be machined to size on the ends and outside diameter. Machining not necessary on inside or outside of seamless steel tubing, but required on ends after necking-down.\n\n(b) For tanks made in foreign countries, chemical analysis of material and all tests as specified must be carried out within the limits of the United States under supervision of a competent and disinterested inspector; in addition to which, provisions in § 179.500-18 (b) and (c) shall be carried out at the point of manufacture by a recognized inspection bureau with principal office in the United States.\n\n(c) The term “marked end” and “marked test pressure” used throughout this specification are defined as follows:\n\n(1) “Marked end” is that end of the tank on which marks prescribed in § 179.500-17 are stamped.\n\n(2) “Marked test pressure” is that pressure in psig which is indicated by the figures substituted for the **** in the marking DOT-107A **** stamped on the marked end of tank.\n\n(d) The gas pressure at 130 °F in the tank shall not exceed 7/10 of the marked test pressure of the tank.\n\n[Amdt. 179-32, 48 FR 27708, June 16, 1983, as amended at 66 FR 45186, 45391, Aug. 28, 2001]","truncated":false,"body_characters":1364}