{"operation":"document","citation":"49 CFR 178.255-4","title":"-4 Closures for manholes and domes.","source_type":"regulation","agency":"Pipeline and Hazardous Materials Safety Administration","status":"current","official":true,"published_on":null,"effective_on":"2026-08-18","summary":"(a) The manhole cover shall be designed to provide a secure closure of the manhole. All covers, not hinged to the tanks, shall be attached to the outside of the dome by at least 1/8 inch chain or its equivalent. Closures shall be made tight against leakage of vapor and liquid by use of gaskets of su","machine_formats":{"json":"https://regulus.evalyn.ai/document/49-cfr-178-255-4.json","markdown":"https://regulus.evalyn.ai/document/49-cfr-178-255-4.md"},"app_url":"https://regulus.evalyn.ai/document/49-cfr-178-255-4","source_url":"https://www.ecfr.gov/on/2026-08-18/title-49/section-178.255-4","body":"(a) The manhole cover shall be designed to provide a secure closure of the manhole. All covers, not hinged to the tanks, shall be attached to the outside of the dome by at least 1/8 inch chain or its equivalent. Closures shall be made tight against leakage of vapor and liquid by use of gaskets of suitable material.\n\n(b) [Reserved]","truncated":false,"body_characters":332}