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7.4 Control handless shall be provided at each side of the bulkhead at
a minimum height of 1.6 m above the floor and shall be so arranged at toenable persons passing through the doorway to hold both handles in the
open position without being able to set the power closing mechanism in
operation accidentally. The direction of movement of the handles in
opening and closing the door shall be in the direction of door movement
and shall be clearly indicated.
7.5 As far as practicable, electrical equipment and components for
watertight doors shall be situated above the bulkhead deck and outside
hazardous areas and spaces.
7.6 The enclosures of electrical components necessarily situated below
the bulkhead deck shall provide suitable protection against the ingress of
water.*
[* Reference is made to the following IEC publication 529: 1976:
.1 electrical motors, associated circuits and control components;
protected to IP x 7 standard;
.2 door position indicators and associated circuit components;
protected to IP x 8 standard; and
.3 door movement warning signals; protected to IP x 6 standard.
Other arrangements for the enclosures of electrical components may be
fitted provided the Administration is satisfied that an equivalent
protection is achieved. The water pressure testing of the enclosures
protected to IP x 8 shall be based on the pressure that may occur at thelocation of the component during flooding for a period of 36 hours.]
7.7 Electric power, control, indication and alarm circuits shall be
protected against fault in such a way that a failure in one door circuitwill not cause a failure in any other door circuit. Short circuits or
other faults in the alarm or indicator circuits of a door shall not result
in a loss of power operation of that door. Arrangements shall be such that
leakage of water into the electrical equipment located below the bulkhead
deck will not cause the door to open.
7.8 A single electrical failure in the power operating or control
system of a power-operated sliding watertight door shall not result in aclosed door opening. Availability of the power supply should be
continuously monitored at a point in the electrical circuit as near as
practicable to each of the motors required by paragraph 7.3. Loss of anysuch power supply should activate an audible and visual alarm at the
central operating console at the navigating bridge.
8.1 The central operating console at the navigating bridge shall have
a "master mode" switch with two modes of control: a "local control" modewhich shall allow any door to be locally opened and locally closed afteruse without automatic closure, and a "doors closed" mode which shall
automatically close any door that is open. The "doors closed" mode shallpermit doors to be opened locally and shall automatically reclose the
doors upon release of the local control mechanism. The "master mode"
switch shall normally be in the "local control" mode. The "doors closed"mode shall only be used in an emergency or for testing purposes. Specialconsideration shall be given to the reliability of the "master mode"
switch.
8.2 The central operating console at the navigating bridge shall be
provided with a diagram showing the location of each door, with visual
indicators to show whether each door is open or closed. A red light shall
indicate a door is fully open and a green light shall indicate a door isfully closed. When the door is closed remotely the red light shall
indicate the intermediate position by flashing. The indicating circuit
shall be independent of the control circuit for each door.
8.3 It shall not be possible to remotely open any door from the
central operating console.
9.1 All watertight doors shall be kept closed during navigation except
that they may be opened during navigation as specified in paragraphs 9.2,
9.3 and 9.4. Watertight doors of width of more than 1.2 m permitted by
paragraph 11 may only be opened in the circumstances detailed in that
paragraph. Any door which is opened in accordance with this paragraph
shall be ready to be immediately closed.
9.2 A watertight door may be opened during navigation to permit the
passage of passengers or crew, or when work in the immediate vicinity ofthe door necessitates it being opened. The door must be immediately closed
when transit through the door is complete or when the task which
necessitated it being open is finished.
9.3 Certain watertight doors may be permitted to remain open during
navigation only if considered absolutely necessary; that is, being open is
determined essential to the safe and effective operation of the ship''s
machinery or to permit passengers normally unrestricted access throughout
the passenger area. Such determination shall be made by the Administration
only after careful consideration of the impact on ship operations and
survivability. A watertight door permitted to remain thus open shall be
clearly indicated in the ship''s stability information and shall always be
ready to be immediately closed.
9.4 Sliding watertight doors fitted between bunkers in the
between-decks below the bulkhead deck may sometimes be open at sea for the
purpose of trimming coal. The opening and closing of these doors shall be
recorded in such log-book as may be prescribed by the Administration.
10.1 If the Administration is satisfied that such doors are essential,
watertight doors of satisfactory construction may be fitted in watertight
bulkheads dividing cargo between deck spaces. Such doors may be hinged,
rolling or sliding doors but shall not be remotely controlled. They shall
be fitted at the highest level and as far from the shell plating as
practicable, but in no case shall the outboard vertical edges be situated
at a distance from the shell plating which is less than one fifth of thebreadth of the ship, as defined in Regulation 2, such distance being
measured at right angles to the centreline at the level of the deepest
subdivision load line.
10.2 Such doors shall be closed before the voyage commences and shall
be kept closed during navigation; the time of opening such doors in portand of closing them before the ship leaves port shall be entered in the
log-book. Should any of the doors be accessible during the voyage, they
shall be fitted with a device which prevents unauthorized opening. When it
is proposed to fit such doors, the number and arrangements shall receivethe special consideration of the Administration.
11 Portable plates on bulkheads shall not be permitted except in
machinery spaces. Such plates shall always be in place before the ship
leaves port, and shall not be removed during navigation except in case of
urgent necessity at the discretion of the master. The times of removal and
replacement of any such portable plates shall be recorded in the log-book,
and the necessary precautions shall be taken in replacing them to ensurethat the joints are watertight. The Administration may permit not more
than one power-operated sliding watertight door in each main transverse
bulkhead larger than those specified in paragraph 7.1.2 to be substituted
for these portable plates, provided these doors are closed before the ship
leaves port and remain closed during navigation except in case of urgentnecessity at the discretion of the master. These doors need not meet therequirements of paragraph 7.1.4 regarding complete closure by
hand-operated gear in 90 seconds. The time of opening and closing these
doors, whether the ship is at sea or in port, shall be recorded in the
log-book.
12.1 Where trunkways or tunnels for access from crew accommodation to
the stokehold, for piping, or for any other purpose are carried throughmain transverse watertight bulkheads, they shall be watertight and in
accordance with the requirements of Regulation 19. The access to at least
one end of each such tunnel or turnkey, if used as a passage at sea,
shall be through a trunk extending watertight to a height sufficient to
permit access above the margin line. The access to the other end of the
turnkey or tunnel may be through a watertight door of the type required by
its location in the ship. Such trunkways or tunnels shall not extend
through the first subdivision bulkhead abaft the collision bulkhead.
12.2 Where it is proposed to fit tunnels piercing main transverse
watertight bulkheads, these shall receive the special consideration of
the Administration.
12.3 Where trunkways in connection with refrigerated cargo and
ventilation or forced draught trunks are carried through more than one
watertight bulkhead, the means of closure at such openings shall be
operated by power and be capable of being closed from a central positionsituated above the bulkhead deck."
Regulation 16 Passenger ships carrying goods vehicles
and accom-panying personnel
The reference to "Regulation 15.12" in paragraph 2 is replaced by
reference to "Regulation 15.10".
Regulation 21 Bilge pumping arrangements
The following text is inserted after the heading:
"(Paragraphs 1.6 and 2.9 of this Regulation apply to ships constructed
on or after 1 February 1992)"
The follow new paragraph 1.6 is added after paragraph 1.5:
"1.6 Provisions shall be made for the drainage of enclosed cargo
spaces situated on the bulkhead deck of a passenger ship and on the
freeboard deck of a cargo ship, provided that the Administration may
permit the means of drainage to be dispensed with in any particular
compartment of any ship or class of ship if it is satisfied that by reason
of size or internal subdivision of those spaces the safety of the ship is
not thereby impaired.
1.6.1 Where the freeboard to the bulkhead deck or the freeboard deck,
respectively, is such that the deck edge is immersed when the ship heelsmore than 5°, the drainage shall be by means of a sufficient number of
scuppers of suitable size discharging directly overboard, fitted in
accordance with the requirements of Regulation 17 in the case of a
passenger ship and the requirements for scuppers, inlets and discharges of
the International Convention on Load Lines in force in the case of a cargo
ship.
1.6.2 Where the freeboard is such that the edge of the bulkhead deck
or the edge of the freeboard deck, respectively, is immersed when the ship
heels 5° or less, the drainage of the enclosed cargo spaces on the
bulkhead deck or on the freeboard deck, respectively, shall be led to a
suitable space, or spaces, of adequate capacity, having a high water level
alarm and provided with suitable arrangements for discharge overboard. In
addition it shall be ensured that:
.1 the number, size and disposition of the scuppers are such as to
prevent unreasonable accumulation of free water;
.2 the pumping arrangements Required by this regulation for
passenger ships or cargo ships, as applicable, take account of the
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