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watertight integrity of the bulkheads.
2.2 Valves not forming part of a piping system shall not be permitted
in watertight subdivision bulkheads.
2.3 Lead or other heat sensitive materials shall not be used in
systems which penetrate watertight subdivision bulkheads, where
deterioration of such systems in the event of fire would impair the
watertight integrity of the bulkheads.
3.1 No doors, manholes, or access openings are permitted:
.1 in the collision bulkhead below the margin line;
.2 in watertight transverse bulkheads dividing a cargo space from
an adjoining cargo space or from a permanent or reserve bunker, except as
provided in paragraph 10.1 and in regulation 16.
3.2 Except as provided in paragraph 3.3, the collision bulkhead may be
pierced below the margin line by not more than one pipe for dealing withfluid in the forepeak tank, provided that the pipe is fitted with a
screwdown valve capable of being operated from above the bulkhead. The
Administration may, however, authorize the fitting of this valve on the
after side of the collision bulkhead provided that the valve is readily
accessible under all service conditions and the space in which it is
located is not a cargo space.
3.3 If the forepeak is divided to hold two different kinds of liquids
the Administration may allow the collision bulkhead to be pierced below
the margin line by two pipes, each of which is fitted as required by
paragraph 3.2, provided the Administration is satisfied that there is nopractical alternative to the fitting of such a second pipe and that,
having regard to the additional subdivision provided in the forepeak, the
safety of the ship is maintained.
4.1 Watertight doors fitted in bulkheads between permanent and reserve
bunkers shall always be accessible, except as provided in paragraph 9.4
for between-deck bunker doors.
4.2 Satisfactory arrangements shall be made by means of screens or
otherwise to prevent the coal from interfering with the closing of
watertight bunker doors.
5 Subject to paragraph 11, not more than one door, apart from the
doors to bunkers and shaft tunnels, may be fitted in each main transverse
bulkhead within spaces containing the main and auxiliary propulsion
machinery including boilers serving the needs of propulsion and all
permanent bunkers. Where two or more shafts are fitted, the tunnels shall
be connected by an intercommunicating passage. There shall be only one
door between the machinery space and the tunnel spaces where two shafts
are fitted and only two doors where there are more than two shafts. All
these doors shall be of the sliding type and shall be so located as to
have their sills as high as practicable. The hand gear for operating these
doors from above the bulkhead deck shall be situated outside the spaces
containing the machinery.
6.1 Watertight doors, except as provided in paragraph 10.1 or
Regulation 16, shall be power-operated sliding doors complying with the
requirements of paragraph 7 capable of being closed simultaneously from
the central operating console at the navigating bridge in not more than 60
seconds with the ship in the upright position.
6.2 The means of operation whether by power or by hand of any
power-operated sliding watertight door shall be capable of closing the
door with the ship listed to 15° either way. Consideration shall also be
given to the forces which may act on either side of the door as may be
experienced when water is flowing through the opening applying a static
head equivalent to a water height of at least 1 m above the sill on the
centreline of the door.
6.3 Watertight door controls, including hydraulic piping and electric
cables, shall be kept as close as practicable to the bulkhead in which the
doors are fitted, in order to minimize the likelihood of them being
involved in any damage which the ship may sustain. The positioning of
watertight doors and their controls shall be such that if the ship
sustains damage within one fifth of the breadth 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, the
operation of the watertight doors clear of the damaged portion of the ship
is not impaired.
6.4 All power-operated sliding watertight doors shall be provided with
means of indication which will show at all remote operating positions
whether the doors are open or closed. Remote operating positions shall
only be at the navigating bridge as required by paragraph 7.1. 5 and, atthe location where hand operation above the bulkhead deck is required byparagraph 7.1.4.
7.1 Each power-operated sliding watertight door:
.1 shall have a vertical or horizontal motion;
.2 shall, subject to paragraph 11, be normally limited to a
maximum clear opening width of 1.2 m. The Administration may permit larger
doors only to the extent considered necessary for the effective operation
of the ship provided that other safety measures, including the following,
are taken into consideration:
.1 special consideration shall be given to the strength of the
door and its closing appliances in order to prevent leakages;
.2 the door shall be located outside the damage zone B/5;
.3 the door shall be kept closed when the ship is at sea,
except for limited periods when absolutely necessary as determined by the
Administration;
.3 shall be fitted with the necessary equipment to open and close
the door using electric power, hydraulic power, or any other form of power
that is acceptable to the Administration;
.4 shall be provided with an individual hand-operated mechanism.
It shall be possible to open and close the door by hand at the door itself
from either side, and in addition, close the door from an accessible
position above the bulkhead deck with an all round crank motion or some
other movement providing the same degree of safety acceptable to the
Administration. Direction of rotation or other movement is to be clearlyindicated at all operating positions. The time necessary for the complete
closure of the door, when operating by hand gear, shall not exceed 90
seconds with the ship in the upright position;
.5 shall be provided with controls for opening and closing the
door by power from both sides of the door and also for closing the door by
power from the central operating console at the navigating bridge;
.6 shall be provided with an audible alarm, distinct from any
other alarm in the area, which will sound whenever the door is closed
remotely by power and which shall sound for at least five seconds but nomore than ten seconds before the door begins to move and shall continue
sounding until the door is completely closed. In the case of remote handoperation it is sufficient for the audible alarm to sound only when the
door is moving. Additionally, in passenger areas and areas of high ambient
noise the Administration may require the audible alarm to be supplemented
by an intermittent visual signal at the door; and
.7 shall have an approximately uniform rate of closure under
power. The closure time, from the time the door begins to move to the
time it reaches the completely closed position, shall in no case be less
than 20 seconds or more than 40 seconds with the ship in the upright
position.
7.2 The electrical power required for power-operated sliding
watertight doors shall be supplied from the emergency switchboard eitherdirectly or by a dedicated distribution board situated above the bulkhead
deck. The associated control, indication and alarm circuits shall be
supplied from the emergency switchboard either directly or by a dedicated
distribution board situated above the bulkhead deck and be capable of
being automatically supplied by the transitional source of emergency
electrical power required by Regulation 42.3.1.3 in the event of failureof either the main or emergency source of electrical power.
7.3 Power-operated sliding watertight doors shall have either:
.1 a centralized hydraulic system with two independent power
sources each consisting of a motor and pump capable of simultaneously
closing all doors. In addition, there shall be for the whole installation
hydraulic accumulators of sufficient capacity to operate all the doors at
least three times, i.e. closed-open-closed, against an adverse list of
15°. This operating cycle shall be capable of being carried out when the
accumulator is at the pump cut-in pressure. The fluid used shall be chose
nconsidering the temperatures liable to be encountered by the installation
during its service. The power operating system shall be designed to
minimize the possibility of having a single failure in the hydraulic
piping adversely affect the operation of more than one door. The hydrauli
csystem shall be provided with a low-level alarm for hydraulic fluid
reservoirs serving the power-operated system and a low gas pressure alarm
or other effective means of monitoring loss of stored energy in hydraulic
accumulators. These alarms are to be audible and visual and shall be
situated on the central operating console at the navigating bridge; or
.2 an independent hydraulic system for each door with each power
source consisting of a motor and pump capable of opening and closing thedoor. In addition, there shall be a hydraulic accumulator of sufficient
capacity to operate the door at least three times, i. e.
closed-open-closed, against an adverse list of 15°. This operating cycle
shall be capable of being carried out when the accumulator is at the pump
cut-in pressure. The fluid used shall be chosen considering the
temperatures liable to be encountered by the installation during its
service. A low gas pressure group alarm or other effective means of
monitoring loss of stored energy in hydraulic accumulators shall be
provided at the central operating console on the navigating bridge. Lossof stored energy indication at each local operating position shall also be
provided; or
.3 an independent electrical system and motor for each door with
each power source consisting of a motor capable of opening and closing the
door. The power source shall be capable of being automatically supplied by
the transitional source of emergency electrical power as required by
Regulation 42.4.2-in the event of failure of either the main or emergency
source of electrical power and with sufficient capacity to operate the
door at least three times, i.e. closed-open-closed against an adverse list
of 15°.
For the systems specified in 7.3.1, 7.3.2 and 7.3.3, provision should
be made as follows:
Power systems for power-operated watertight sliding doors shall be
separate from any other power system. A single failure in the electric or
hydraulic power-operated systems excluding the hydraulic actuator shall
not prevent the hand operation of any door.
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