Openings
in watertight bulkheads and internal decks
(1) (a) The
number of openings in the boundaries of watertight compartments shall be the
minimum compatible with the design and proper working of the ship.
(b) Where
penetration of watertight bulkheads and internal decks is necessary for access,
piping, ventilation, electrical cables, or for any other purpose, arrangements
shall be made to maintain watertight integrity at each such point of
penetration.
(c) The
Administration may permit openings in compartment boundaries above the
freeboard deck to be weathertight rather than watertight where it is
demonstrated that any progressive flooding resulting therefrom can be easily
controlled and the safety of the ship would not be impaired.
(2) (a) Doors
provided to ensure the watertight integrity of internal openings which are used
while the ship is at sea shall be of the sliding watertight type and capable of
being remotely closed from the bridge and capable also of being operated
locally from each side of the door without the door closing automatically.
(b) Indicators
shall be provided at the bridge position showing whether the doors are open or
closed, and an audible alarm shall be provided when the door closes.
(c) The
power for operating and controlling the doors, indicators and alarms shall be
supplied from the emergency switchboard required by regulation 51.
(d) The
control system shall be so designed that if the system fails, closure by hand
will not be prevented or impeded.
(e) Each
power-operated sliding watertight door shall be provided with an individual
hand-operated opening and closing mechanism. Means shall be provided at the
door itself to open and close the door safely by hand from both sides and from
an accessible position above the bulkhead deck.
(3) (a) Access
doors and access hatch covers normally closed at sea and intended to ensure the
watertight integrity of internal openings, shall be provided locally and on the
bridge, with indicators to show whether these doors or hatch covers are open or
closed.
(b) A
notice shall be affixed to each such door or hatch cover stating that it is not
to be left open at sea.
(c) Such
doors and hatch covers shall not be used except where access is necessary and
is authorised by the officer of the watch.
(4) (a) Watertight
doors or ramps of satisfactory construction may be fitted to subdivide large
cargo spaces internally where the Administration is satisfied that such doors
or ramps are essential.
(b) These
watertight doors or ramps may be of the hinged, rolling or sliding type, but
shall not be remotely controlled
(c) They
shall be closed before the voyage commences and shall be kept closed throughout
the voyage and the time of opening such doors or ramps when the voyage has
ended and of closing them before the voyage commences shall be entered in the
log book.
(d) Any
doors or ramps which may be accessible during the voyage shall be fitted with a
device which prevents unauthorised opening.
(5) Every closing appliance which is
required to be kept permanently closed at sea to ensure the watertight
integrity of a compartment shall be provided with a notice affixed to it
stating that it is to be kept closed, except that manholes secured by closely
bolted covers need not be so marked.
External
openings
(1) All
external openings which lead to compartments assumed intact for the purposes of
calculating the subdivision index "A", and which are below the final
waterlines, shall be watertight.
(2) External openings required to be
watertight in accordance with subregulation (1) shall be of sufficient strength
and, except in the case of cargo hatch covers, shall be fitted with indicators
on the bridge.
(3) Openings in the shell plating below
the deck limiting the vertical extent of damage shall be kept permanently
closed while at sea. Any of these openings which may be accessible during the
voyage, shall be fitted with a device which prevents unauthorised opening.
(4) Notwithstanding the requirements of
subregulation (3), the Administration may authorise the opening of specific
doors, at the discretion of the master, if it is satisfied that such opening is
necessary for the operation of the ship and provided that the safety of the
ship would not be thereby impaired.
(5) Every watertight closing appliance
which is required to be permanently closed at sea to ensure the integrity of an
external opening shall be provided with a notice affixed to it stating that it
is to be kept closed at sea; provided that manholes secured by closely bolted
covers need not be so marked.
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