3.6.1 The number of openings in watertight subdivisions
should be kept to a minimum compatible with the design and proper
working of the unit. Where penetrations of watertight decks and bulkheads
are necessary for access, piping, ventilation, electrical cables,
etc., arrangements should be made to maintain the watertight integrity
of the enclosed compartments.
3.6.2
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.1 Where valves are provided at watertight boundaries
to maintain watertight integrity, these valves should be capable of
being operated from a pump room or other normally manned space, a
weather deck, or a deck which is above the final waterline after flooding.
Valve position indicators should be provided at the remote control
station.
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.2 For self-elevating units the ventilation system
valves required to maintain watertight integrity should be kept closed
when the unit is afloat. Necessary ventilation in this case should
be arranged by alternative approved methods.