Hong Kong Regulations

MERCHANT SHIPPING (INSTRUCTIONS TO SURVEYORS) (PASSENGER SHIPS) REGULATIONS - REGULATION 45

Discharge pipes, valves, etc.

(1) Discharge pipes, no matter of what material they may be made, are not to
be fitted in a direct line between the outboard openings and the connections
with the decks, water closets or similar fittings, but are to be arranged with
bends or elbows of substantial metal, other than cast iron or lead.

(2) Pipes made of lead should have a sufficient bend to provide for expansion
of the pipe or any movement due to the working of the ship.

(3) The pipes and valves should be protected from the cargo by substantial
casings which need not be watertight.

(4) All bolts connecting cocks, valves, pipes, etc., to the shell plating of
the ship must have their heads outside and the heads should be either
countersunk or cup-headed.

(5) When water closets of the under-waterline type are to be fitted, plans
should be specially submitted for approval.

(6) Special arrangements for the drainage of a watertight deck will usually be
necessary, and the drainage pipes shall be so fitted with valves, or disposed
in such a manner, as to avoid risk of water passing from a damaged to an
undamaged compartment.