How is a Class B fire extinguished?

A Class B fire involves flammable liquids and gases, such as oil, gasoline, and grease, which can ignite and spread rapidly. To effectively extinguish a Class B fire, it's crucial to use agents that are capable of smothering the flames or interrupting the chemical reaction of the fire.

Using foam or dry chemical agents is the most effective method for this type of fire. Foam can blanket the surface of the flammable liquid, cutting off the oxygen supply and preventing vapor release, which helps to extinguish the fire. Dry chemical agents, such as those based on sodium bicarbonate or monoammonium phosphate, work by coating the fuel and inhibiting the chemical reactions that sustain the fire.

Water, while effective for Class A fires (ordinary combustibles like wood and paper), is not appropriate for Class B fires. It can cause flammable liquids to spread, potentially worsening the situation. Removing the source of fuel is a component of fire prevention but is not a method for extinguishing an already existing fire. Using sand or dirt can sometimes be used for Class B fires, but it is less effective than foam or chemical agents in properly smothering and disrupting the fire's combustion process. Therefore, foam or dry chemical agents are the recommended