Hong Kong Regulations

MERCHANT SHIPPING (INSTRUCTIONS TO SURVEYORS) (PASSENGER SHIPS) REGULATIONS - REGULATION 35

Doors which close by their own weight

If a door is required to be closed by dropping or by the action of a dropping
weight, it shall be fitted with a suitable arrangement to regulate the closing
movement and the gearing shall be so arranged that the door can be released
both at the door itself and at an accessible position above the bulkhead deck.
Hand gear shall also be provided, so arranged as to operate at the door itself
and above the bulkhead deck, and also so that, after being disengaged for
dropping, it can be quickly re-engaged from either the upper or the lower
position. If the surveyor is of opinion that there is danger of persons being
injured while passing through a doorway in a bulkhead owing to the door being
of a quick-closing type, or for any other reason, a report of all the
circumstances should be forwarded to the Principal Surveyor of Ships before a
declaration is issued.