49 CFR 178.255-4 - Closures for manholes and domes.
(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.
Title 49 published on 2014-10-01
no entries appear in the Federal Register after this date.