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 TM 55-1905-223-SDC
the amount of water used, and minimizes the water damage to equipment not involved in the fire.
Water in the form of a solid stream is not a preferred method of water use on board ships. It is not as efficient
as fog and can add large quantities of water to an area which must eventually be pumped out. The splashing
effect of the solid stream also tends to cause damage to surrounding equipment.
b. C02. C02 is effective as an extinguishing agent primarily because it reduces the air to a point where
it will no longer be capable of supporting combustion. As a rule, one pound of C02 will make inert 14.5 cubic
feet of space. Prolonged breathing in an atmosphere of high C02 concentration, about 2 to 3 percent, can
cause headaches and nausea. High concentration will cause suffocation, very much the same as immersion
in water does when a person drowns. Since C02 is 1-1/2 times heavier than air, it does not rise, but remains
close to the surface in a deep or shallow pool, according to the area covered and the amount of C02 used.
With a portable C02 extinguisher, there is little danger, in as much as its 35 cubic feet of C02 in the average
compartment lies in shallow pools, lower than the average breathing height. C02 is a dry, noncorrosive gas
that is inert when in contact with most substances. C02 does not cause damage to equipment.
6-9
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