49 CFR 179.200-15 - Closures for manways.
(a) Manway covers must be of approved type.
(b) Manway covers shall be designed to provide a secure closure of the manway.
(c) Manway covers must be of approved cast, forged, or fabricated metals. Malleable iron, if used, must comply with ASTM A 47 (IBR, see § 171.7 of this subchapter), Grade 35018. Cast iron manway covers must not be used.
(d) All joints between manway covers and their seats shall be made tight against leakage of vapor and liquid by use of gaskets of suitable material.
(e) For other manway cover requirements see § 179.201-1.