4.4.1 The strength of a watertight bulkhead and
the effectiveness of any alternative means should be adequate for
the intended purpose and to the satisfaction of the Certifying Authority.
4.4.2 When pipes, cables, etc penetrate watertight
bulkheads, they should be provided with valves and/or watertight glands,
as appropriate.
4.4.3 A doorway fitted in a watertight bulkhead
should be constructed so as to be watertight from both sides and be
kept closed at sea, unless opened for access only, at the discretion
of the skipper. A notice should be fitted to both sides of the door
"To be kept closed at sea, open for access only". Sliding watertight
doors, where fitted, are to be provided with suitable safety provision
to avoid injury to personnel by closure of the door.