The
release mechanism of CO2 system in cargo spaces is same as that of the
machinery spaces. The only difference is that the cargo spaces have a
different type of fire detection system.
For
detection of fire in cargo hold, a sample of air is drawn from all the
cargo holds by an extractor fan.This sample of air is passed through a
cabinet wherein a set of smoke sensitive sensors analyze the sample. The
sensors will detect any presence of smoke in the sample. As soon as the
sensor detects smoke in the sample, it activates the CO2 alarm system
of the ship. A part of the sample is also discharged to the wheelhouse
in order to cross-check the presence of smoke in the sample. This can be
done by smelling the smoke. The sample is later vented to the air.
In
order to check whether the extractor is extracting samples from the
holds, a small indicator propeller is fitted, which ensures that the
samples are taken.
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