Hong Kong Regulations

MERCHANT SHIPPING (INSTRUCTIONS TO SURVEYORS) (PASSENGER SHIPS) REGULATIONS - REGULATION 44

Scuppers, sanitary and other similar discharges

(1) The number of scuppers, sanitary discharges and other similar openings
shall be reduced to the minimum either by making each discharge serve for as
many as possible of the sanitary and other pipes, or in any other satisfactory
manner.

(2) (a) Discharges led through the ship's sides from spaces below the margin
line shall be fitted with efficient and accessible means for preventing water
from passing inboard. It is permissible to have for each separate discharge
either one automatic non-return valve fitted with a positive means of closing
it from above the bulkhead deck, or, alternatively, two automatic non-return
valves without such means, the upper of which valves is so situated above the
deepest subdivision load line as to be always accessible for examination under
service conditions.

   (b)  Where a positive action valve is fitted, the operating position above
        the bulkhead deck shall always be readily accessible and means shall
        be provided for indicating whether the valve is free or closed down.

   (c)  Where the two-valve system is adopted the higher valve should be of
        the horizontal balanced type normally closed.

   (d)  The geared valve, or the lower of the two non-geared valves is to be
        fitted in a strong valve box secured to the shell plating.