49 C.F.R. § 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
(b) [Reserved]
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(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
(b) [Reserved]