Page 262 - Introduction to Marine Engineering

Fire fighting and safely 237

Carbon dioxide extinguisher
A very strong container is used to store liquid carbon dioxide under
pressure (Figure 13.6). A central tube provides the outlet passage for the
carbon dioxide which is released either by a plunger bursting a disc or a
valve operated by a trigger. The liquid changes to a gas as it leaves the
extinguisher and passes through a swivel pipe or hose to a discharge
horn.
Carbon dioxide extinguishers are mainly used on Class B and C fires
and will be found in the machinery space, particularly near electrical

Strike knob

Piercer

Carbon dioxide (vapour)

Carbon dioxide (liquid)

Figure 13.6 Carbon dioxide extinguisher