(a)
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(i) The design, materials and construction of
all watertight doors, sidescuttles, gangway, cargo and other ports,
valves, pipes, and rubbish-shoots referred to in these Regulations
shall be to the satisfaction of the Administration.
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(ii) The frames of vertical watertight doors shall
have no groove at the bottom in which dirt might lodge and prevent
the door closing properly.
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(iii) All cocks and valves for sea inlets and
discharges below the immersion limit line and all fittings outboard
of such cocks and valves shall be made of steel, bronze or other approved
ductile material. Ordinary cast iron or similar materials shall not
be used.
(b) Each watertight door shall be tested by water
pressure to a head up to the immersion limit line. The test shall
be made before the ship is put in service, either before or after
the door is fitted.