{"operation":"document","citation":"49 CFR 178.338-5","title":"-5 Stiffening rings.","source_type":"regulation","agency":"Pipeline and Hazardous Materials Safety Administration","status":"current","official":true,"published_on":null,"effective_on":"2026-08-18","summary":"(a) A tank is not required to be provided with stiffening rings, except as prescribed in Section VIII of the ASME Code (IBR, see § 171.7 of this subchapter).\n\n(b) If a jacket is evacuated, it must be constructed in compliance with § 178.338-1(f). Stiffening rings may be used to meet these requiremen","machine_formats":{"json":"https://regulus.evalyn.ai/document/49-cfr-178-338-5.json","markdown":"https://regulus.evalyn.ai/document/49-cfr-178-338-5.md"},"app_url":"https://regulus.evalyn.ai/document/49-cfr-178-338-5","source_url":"https://www.ecfr.gov/on/2026-08-18/title-49/section-178.338-5","body":"(a) A tank is not required to be provided with stiffening rings, except as prescribed in Section VIII of the ASME Code (IBR, see § 171.7 of this subchapter).\n\n(b) If a jacket is evacuated, it must be constructed in compliance with § 178.338-1(f). Stiffening rings may be used to meet these requirements.\n\n[Amdt. 178-77, 48 FR 27704, June 16, 1983, as amended at 68 FR 75754, Dec. 31, 2003]","truncated":false,"body_characters":389}