Pressurized water fire extinguishers

For example, the first basic job step in using a pressurized water fire extinguisher would be ... 

Pressurized water fire extinguishers manufactured prior to 1971 ... 

If an ethyl ether fire occurs, carbon dioxide, carbon tetrachloride, and dry chemical fire extinguishers meeting National Eire Prevention Association Code 1 and 2 requirements may be used successhiUy (23). Water may also be effectively appHed (see Plant safety). Hose streams played into open tanks of burning ethyl ether serve only to scatter the Hquid and spread the fire. However, ether fires may be extinguished by a high pressure water spray that cools the burning surface and smothers the fire. Automatic sprinklers and deluge systems are also effective. 

Fire Hazards - Flash Point (deg. F) 175 - 185 OC 178 CC Flammable Umits in Air (%) LEL 1.4 (ortho) 1.1 (meta or para) Fire Extinguishing Agents Water, dry chemical, carbon dioxide, and foam Fire Extinguishing Agents Not To Be Used Not pertinent Special Hazards of Combustion Products Flammable toxic vapors given off in a fire Behavior in Fire Sealed closed containers can build up pressure if exposed to heat (fire) Ignition Temperature (deg. f) 1110 (o-cresol) 1038 (m-or p-cresol) Electrical Hazard Data not available Burning Rate Data not available,... 

As the gas pressure inside the extinguisher increases, it pushes a jet of water out of the extinguisher s nozzle. Because soda acid extinguishers expel water, they should only be used on class "A" fires. Class "A" fires are those that involve wood, paper, cardboard, and cloth. Soda-acid fire extinguishers should never be used on electrical or grease fires because the water they use can cause these kinds of fires to spread and burn out of control. 

Class A fire extinguishers are usually water based. Water provides a heat-absorbing (cooling) effect on the burning material to extinguish the fire. Pressurized water extinguishers use air under pressure to expel the water. 

Fire For an infectious disease or weapon, use available methods and equipment on surrounding fires. Appropriate extinguishing agents dry chemical, soda ash, sand, or lime. Do not use high pressure water streams... 

Pressurized water extinguishers should be hydrostatically tested to at least 200 psig (1,379 kPa). The design should provide automatic pressure release for safety upon disassembly. A listed fire extinguisher containing antifreeze agent suitable for the minimum expected temperature should be supplied when necessary. 

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