Ingangsdatum:
01-01-1996
7.7.1
Areas of major and moderate fire hazard and other enclosed spaces in
the accommodation not regularly occupied, such as toilets, stairway
enclosures and corridors, should be provided with an approved
automatic smoke-detection system and manually operated call points
to indicate at the control station the location of outbreak of d
fire in all normal operating conditions of the installations. Main
propulsion machinery room(s) should in addition have detectors
sensing other than smoke and be supervised by TV cameras monitored
from the operating compartment. Manually operated call points should
be installed throughout the accommodation spaces, service spaces
and, where necessary, control stations. One manually operated call
point should be located at each exit from these spaces and from
areas of major fire hazard.
7.7.2 The fixed
fire-detection and fire alarm systems should comply with the
following requirements.
7.7.2.1
General requirements.1 Any required fixed fire-detection
and fire alarm system with manually operated call points should be
capable of immediate operation at all times.
.2 Power supplies and
electric circuits necessary for the operation of the system should
be monitored for loss of power or fault conditions as appropriate.
occurrence of a fault condition should initiate a visual and audible
fault signal at the control panel which should be distinct from
afire signal.
.3 There
should be not less than two sources of power supply for the
electrical equipment used in the operation of the fixed
fire-detection and fire alarm systems, one of which should be an
emergency source. The supply should be provided by separate feeders
reserved solely for that purpose. Such feeders should run to an
automatic change-over switch situated in or adjacent to the control
panel for the fire-detection system.
.4 Detectors and
manually operated call points should be grouped into sections. The
activation of any detector or manually operated call point should
initiate a visual and audible fire signal at the control panel and
indicating units. If the signals have not received attention within
two minutes an audible alarm should be automatically sounded
throughout the crew accommodation and service spaces, control
stations and machinery spaces. This alarm sounder system need not be
an integral part of the firedetection system.
.5 The control panel
should be located in the operating compartment or in the main fire
control station.
.6
Indicating units should, as a minimum, denote the section in which a
detector or manually operated call point has operated. At least one
unit should be so located that it is easily accessible to
responsible members of the crew at all times, when at sea or in
port, except when the craft is out of service. one indicating unit
should be located in the operating compartment if the control panel
is located in the space other than the operating compartment.
.7 Clear information
should be displayed on or adjacent to each indicating unit about the
spaces covered and the location of the sections.
.8 Where the
fire-detection system does not include means of remotely identifying
each detector individually, no section covering more than one deck
within accommodation spaces, service spaces and control stations
should normally be permitted except a section which covers an
enclosed stairway. In order to avoid delay in identifying the source
of fire, the number of enclosed spaces included in each section
should be limited as determined by the Administration. In no Case
should more than 5p enclosed spaces be permitted in any section. If
the detection system is fitted with remotely and individually
identifiable fire detectors, the sections may cover several decks
and serve any number of enclosed spaces.
.9 In passenger craft,
if there is no fire-detection system capable of remotely and
individually identifying each detector, a section of detectors
should not serve spaces on both sides of the craft nor on more than
one deck and neither should it be situated in more than one zone
according to 7.11.1 except that the Administration, if it is
satisfied that the protection of the craft against fire will not
thereby be reduced, may permit such a section of detectors to serve
both sides of the craft and more than one deck. In passenger craft
fitted with individually identifiable fire detectors, a section may
serve spaces on both sides of the craft and on several decks.
.10 A section of fire
detectors which covers a control station, a service space or an
accommodation space, should not include a machinery space of major
fire hazard.
.11 Detectors
should be operated by heat, smoke or other products of combustion,
flame, or any combination of these factors. Detectors operated by
other factors indicative of incipient fires may be considered by the
Administration provided that they are no less sensitive than such
detectors. Flame detectors should only be used in addition to smoke
or heat detectors.
.12
Suitable instructions and component spares for testing and
maintenance should be provided.
.13 The function of the
detection system should be periodically tested by means of equipment
producing hot air at the appropriate temperature, or smoke or
aerosol particles having the appropriate range of density or
particle size, or other phenomena associated with incipient fires to
which the detector is designed to respond. All detectors should be
of a type such that they can be tested for correct operation and
restored to normal surveillance without the renewal of any
component.
.14 The
fire-detection system should not be used for any other purpose,
except that closing of fire doors and similar functions may be
permitted at the control panel.
.15 Fire-detection
systems with a zone address identification capability should be so
arranged that:
.1 a loop
cannot be damaged at more than one point by a fire;
.2 means are provided
to ensure that any fault (e.g., power break; short circuit; earth)
occurring in the loop should not render the whole loop ineffective;
.3 all arrangements are
made to enable the initial configuration of the system to be
restored in the event of failure (electrical, electronic,
informatic); and
.4 the
first initiated fire alarm should not prevent any other detector to
initiate further fire alarms.
7.7.2.2 Installation
requirements:.1 Manually operated call points
should be installed throughout the accommodation spaces, service
spaces and control stations. one manually operated call point should
be located at each exit. Manually operated call points should be
readily accessible in the corridors of each deck such that no part
of the corridor is more than 20 m from a manually operated call
point.
.2 Smoke detectors
should be installed in all stairways, corridors and escape routes
within accommodation spaces. Consideration should be given to the
installation of specialpurpose smoke detectors within ventilation
ducting.
.3 Where a fixed
fire-detection and fire alarm system is required for the protection
of spaces other than those specified in .2, at least one detector
complying with 7.7.2.1.11 should be installed in each such space.
.4 Detectors should be
located for optimum performance. Positions near beams and
ventilation ducts or other positions where patterns of air flow
could adversely affect performance and positions where impact or
physical damage is likely should be avoided. In general, detectors
which are located on the overhead should be a minimum distance of
0.5 m away from bulkheads.
.5 The maximum spacing
of detectors should be in accordance with the table below:
The Administration may require or permit other
spacings based upon test data which demonstrate the characteristics
of the detectors.
.6
Electrical wiring which forms part of the system should be so
arranged as to avoid machinery spaces of major fire hazard, and
other enclosed spaces of major fire hazard except, where it is
necessary, to provide for fire detection or fire alarm in such
spaces or to connect to the appropriate power supply.
7.7.2.3 Design requirements:.1 The system and equipment should be
suitably designed to withstand supply voltage variation and
transients, ambient temperature changes, vibration, humidity, shock,
impact and corrosion normally encountered in ships.
.2 Smoke detectors
required by paragraph 7.7.2.2.2 should be certified to operate
before the smoke density exceeds 12.5% obscuration per metre, but
not until the smoke density exceeds 2% obscuration per metre. Smoke
detectors to be installed in other spaces should operate within
sensitivity limits to the satisfaction of the Administration having
regard to the avoidance of detector insensitivity or
over-sensitivity.
.3 Heat
detectors should be certified to operate before the temperature
exceeds 78° C but not until the temperature exceeds 54° C, when the
temperature is raised to those limits at a rate less than 1° C per
minute. At higher rates of temperature rise, the heat detector
should operate within temperature limits having regard to the
avoidance of detector insensitivity or over-sensitivity.
.4 At the discretion of
the Administration, the permissible temperature of operation of heat
detectors may be increased to 30° C above the maximum deckhead
temperature in drying rooms and similar spaces of anormal high
ambient temperature.
.5
Flame detectors referred to in 7.7.2.1.11 should have a sensitivity
sufficient to determine flame against an illuminated space
background and a false signal identification system.
7.7.3 A fixed
fire-detection and fire alarm system for periodically unattended
machinery spaces should comply with the following requirements:
.1 The fire-detection system
should be so designed and the detectors so positioned as to detect
rapidly the onset of fire in any part of those spaces and under any
normal conditions of operation of the machinery and variations of
ventilation as required by the possible range of ambient
temperatures. Except in spaces of restricted height and where their
use is specially appropriate, detection system using only thermal
detectors should not be permitted. The detection system should
initiate audible and visual alarms distinct in both respects from
the alarms of any other system not indicating fire, in sufficient
places to ensure that the alarms are heard and observed on the
navigating bridge and by a responsible engineer officer. When the
operating compartment is unmanned the alarm should sound in a place
where a responsible member of the crew is on duty.
.2 After installation,
the system should be tested under varying conditions of engine
operation and ventilation.
7.7.4 Areas of major
fire hazard should be protected by an approved fixed extinguishing
system operable from the control position which is adequate for the
fire hazard that may exist. The system should be capable of local
manual control and remote control from the continuously manned
control stations.
7.7.5 In
all craft where gas is used as the extinguishing medium, the
quantity of gas should be sufficient to provide two independent
discharges. The second discharge into the space should only be
activated (released) manually from a position outside the space
being protected. Where the space has a second fixed means of
extinguishing installed, then the second discharge should not be
required.
7.7.6.1 The fixed
fire-extinguishing systems should comply with the following
requirements:
.1 The use of a
fire-extinguishing medium which, in the opinion of the
Administration, either by itself or under expected conditions of use
will adversely affect the earth's ozone layer and/or gives off toxic
gases in such quantities as to endanger persons should not be
permitted.
.2 The necessary
pipes for conveying fire-extinguishing medium into protected spaces
should be provided with control valves so marked as to indicate
clearly the spaces to which the pipes are led. Nonreturn valves
should be installed in discharge lines between cylinders and
manifolds. Suitable provision should be made to prevent inadvertent
admission of the medium to any space.
.3 The piping for the
distribution of fire-extinguishing medium should be arranged and
discharge nozzles so positioned that a uniform distribution of
medium is obtained.
.4
Means should be provided to close all openings which may admit air
to, or allow gas to escape from, a protected space.
.5 Where the volume of
free air contained in air receivers in any space is such that, if
released in such space in the event of fire, such release of air
within that space would seriously affect the efficiency of the fixed
fire-extinguishing system, the Administration should require the
provision of an additional quantity of fire-extinguishing medium.
.6 Means should be
provided for automatically giving audible warning of the release of
fire-extinguishing medium into any space in which personnel normally
work or to which they have access. The alarm should operate for a
suitable period before the medium is released.
.7 The means of control
of any fixed gas fire-extinguishing system should be readily
accessible and simple to operate and should be grouped together in
as few locations as possible at positions not likely to be cut off
by a fire in a protected space. At each location there should be
clear instructions relating to the operation of the system, having
regard to the safety of personnel.
.8 Automatic release of
fire-extinguishing medium should not be permitted.
.9 Where the quantity
of extinguishing medium is required to protect more than one space,
the quantity of medium available need not be more than the largest
quantity required for any one space so protected.
.10 Pressure containers
required for the storage of fire-extinguishing medium should be
located outside protected spaces in accordance with 7.7.6.1.13.
.11 Means should be
provided for the crew to safely check the quantity of medium in the
containers.
.12 Containers
for the storage of fire-extinguishing medium and associated pressure
components should be designed to pressure codes of practice to the
satisfaction of the Administration, having regard to their locations
and maximum ambient temperatures expected in service.
.13 When the
fire-extinguishing medium is stored outside a protected space, it
should be stored in a room which should be situated in a safe and
readily accessible position and should be effectively ventilated.
Any entrance to such a storage room should preferably be from the
open deck and in any case should be independent of the protected
space. Access doors should open outwards, and bulkheads and decks
including doors and other means of closing any opening therein,
which form the boundaries between such rooms and adjoining enclosed
spaces, should be gastight. Such storage rooms should be treated as
control stations.
.14 Spare
parts for the system should be stored on board or at a base port.
7.7.6.2 Carbon dioxide systems.1 For cargo spaces, the quantity of
carbon dioxide available should, unless otherwise provided, be
sufficient to give a minimum volume of free gas equal to 30% of the
gross volume of the largest cargo space so protected in the craft.
.2 For machinery spaces, the
quantity of carbon dioxide carried should be sufficient to give a
minimum volume of free gas equal to the larger of the following
volumes, either:
.2.1 40%
of the gross volume of the largest machinery space so protected, the
volume to exclude that part of the casing above the level at which
the horizontal area of the casing is 40% or less of the horizontal
area of the space concerned taken midway between the tank top and
the lowest part of the casing; or
.2.2 35% of the gross
volume of the largest machinery space protected, including the
casing; provided that the above-mentioned percentages may be reduced
to 35% and 30% respectively for cargo craft of less than 2,000 tons
gross tonnage; provided also that if two or more machinery spaces
are not entirely separate they should be considered as forming one
space.
.3 For the purpose
of this paragraph the volume of free carbon dioxide should be
calculated at 0.56m
3/kg.
.4 For machinery
spaces, the fixed piping system should be such that 85% of the gas
can be discharged into the space within 2 min.
.5 Two separate
controls should be provided for releasing carbon dioxide into a
protected space and to ensure the activation of the alarm. One
control should be used to discharge the gas from its storage
containers. A second control should be used for opening the valve of
the piping which conveys the gas into the protected spaces.
.6 The two controls
should be located inside a release box clearly identified for the
particular space. If the box containing the controls is to be
locked, a key to the box should be in a break-glass type enclosure
conspicuously located adjacent to the box.
7.7.7
Control stations, accommodation spaces and service spaces should be
provided with portable fire extinguishers of appropriate types. At
least five portable extinguishers should be provided, and so
positioned as to be readily available for immediate use. In
addition, at least one extinguisher suitable for machinery space
fires should be positioned outside each machinery space entrance.
7.7.8 Fire pumps, and
appropriate associated equipment, or alternative effective
fire-extinguishing systems should be fitted as follows:
.1 At least two independently
driven pumps should be arranged. Each pump should have at least
two-thirds the capacity of a bilge pump as determined by 10.3.5 and
10.3.6 but not less than 25m
3/h. Each fire
pump should be able to deliver sufficient quantity and pressure of
water to simultaneously operate the hydrants as required by .4.
.2 The arrangement of
the pumps should be such that in the event of a fire in any one
compartment, all the fire pumps will not be putout of action.
.3 Isolating valves to
separate the section of the fire main within the machinery space
containing the main fire pump or pumps from the rest of the fire
main should be fitted in an easily accessible and tenable position
outside the machinery spaces. The fire main should be so arranged
that when the isolating valves are shut all the hydrants on the
craft, except those in the machinery space referred to above, can be
supplied with water by a fire pump not located in this machinery
space through pipes which do not enter this space.
.4 Hydrants should be
arranged so that any location on the craft can be reached by the
water jets from two fire hoses from two different hydrants, one of
the jets being from a single length of hose. Special-category spaces
hydrants should be located so that any location within the space can
be reached by two water jets from two different hydrants, each jet
being supplied from a single length of hose.
.5 Each fire hose
should be of non-perishable material and have a maximum length
approved by the Administration. Fire hoses, together with any
necessary fittings and tools, should be kept ready for use in
conspicuous positions near the hydrants. All fire hoses in interior
locations should be connected to the hydrants at all times. one fire
hose should be provided for each hydrant as required by .4.
.6 Each fire hose
should be provided with a nozzle of an approved dual-purpose type
(i.e. spray/jet type) incorporating a shutoff.