8.3.4 An approved fire detection system based
on the self-monitoring principle and including facilities for periodical
testing should be installed in periodically unattended machinery spaces.
8.3.5 The fire detection system should comply
with the following.
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.1 This 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
systems 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 at the locations determined in accordance with paragraph
8.7.1.
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.2 After installation the system should be tested
under varying conditions of engine operation and ventilation.
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.3 The fire detection system, where electrically
supplied, should be fed automatically from an emergency source of
power by a separate feeder if the main source of power fails.
8.3.6 Means should be provided in case of fire:
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.1 in boiler air supply casings and exhausts (uptakes);
and
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.2 in scavenging air belts of propulsion machinery,
to detect fires and give alarms at an early stage, unless the
Administration considers this to be unnecessary in a particular case.
8.3.7 Internal combustion engines of 2,250 kW
and above or having cylinders of more than 300 mm bore should be provided
with crankcase oil mist detectors or engine bearing temperature monitors
or equivalent devices.