46 C.F.R. § 171.112 Watertight door openings.
Title 46 - Shipping
(a) The opening for a watertight door must be located as high in the bulkhead and as far inboard as practicable. (b) No more than one door, other than a door to a bunker or shaft alley, may be fitted in a main transverse watertight bulkhead within spaces containing the following: (1) Main and auxiliary propulsion machinery. (2) Propulsion boilers. (3) Permanent bunkers.
Title 46: Shipping
PART 171—SPECIAL RULES PERTAINING TO VESSELS CARRYING PASSENGERS
Subpart E—Penetrations and Openings in Watertight Bulkheads
§ 171.112 Watertight door openings.
