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Attempts to extinguish a grease fire during a demonstration. In fire classes, a Class B fire is a fire in flammable liquids or flammable gases, petroleum greases, tars, oils, oil-based paints, solvents, lacquers, or alcohols. [1] For example, propane, natural gas, gasoline and kerosene fires are types of Class B fires.
A carbon dioxide fire extinguisher rated for flammable liquids and gasses. Class B fires are those where the fuel is flammable or combustible liquid. The US system includes flammable gases in their "Class B". [4] In the European/Australian system, flammable liquids are designated "Class B" having flash point less than 100 °C (212 °F). [5]
Water-based extinguishers cannot be used safely on energized electrical fires or flammable liquid fires. [ 30 ] Pump-Type water extinguisher typically consist of a 2-1/2 or 5-gallon non-pressurized metal or plastic container with a pump mounted to it, as well as a discharge hose and nozzle.
Dry chemical powder is used on all classes of fires. Dry chemical powder puts out the fire by coating the burning material with a thin layer of dust, thereby separating the fuel from the oxygen in the air. The powder also works to interrupt the chemical reaction of fire, so these extinguishers are extremely effective at putting out the fire.
Purple-K, also known as PKP, is a dry-chemical fire suppression agent used in some dry chemical fire extinguishers. [1] It is the second most effective dry chemical in fighting class B (flammable liquid) fires after Monnex (potassium allophanate), and can be used against some energized electrical equipment fires (USA class C fires). [2]
For example, water is typically ineffective on oil fires, and can be dangerous. Fire-fighting foams were developed for extinguishing oil fires. In 1902, a method of extinguishing flammable liquid fires by blanketing them with foam was introduced by Russian engineer and chemist Aleksandr Loran.
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