- (a) Inner container manway nozzle must be of approved design with access opening at least 18 inches inside diameter, or at least 14 inches by 18 inches obround or oval.
- (b) Manway covers must be of approved type. Design must provide a secure closure of the manway and must make it impossible to remove the cover while the tank interior is under pressure.
- (c) All joints between manway covers and their seats must be made tight against leakage of vapor and liquid by use of suitable gaskets.
- (d) Manway covers must be cast, forged, or fabricated metal complying with subsection § 179.220-7(g) of this section.
- (e) A seal must be provided between the inner container manway nozzle and the opening in the outer shell.
[Amdt. 179-9, 36 FR 21341, Nov. 6, 1971]