Class-B Fires
Some Class-B fires (hydrocarbons, petroleums, and fuels on fire) cannot be efficiently controlled with water. Fuels with a specific gravity less than water, such as gasoline or oil, float on water, resulting in the fire continuing in the fuel on top of the water. The application of a combination of fire suppressant foam mixed with water is a common and effective method of forming a blanket on top of the liquid fuel which eliminates the oxygen needed for combustion.The configuration of some fuels, such as coal and baled waste paper, result in a deep seated and burrowing fire, resulting in less effective fire control by the application of water on the outer surfaces of the fuel.
Some class-B fires can be controlled with the application of chemical fire suppressants.
Read more about this topic: Fire Control
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