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The larger the burn pan fire, the larger the rating and the longer the extinguisher must discharge to be able to handle the larger volume of fire before running out. For a given size extinguisher the resulting effect is a lower flow rate, resulting in a higher UL rating. Generally for same size extinguishers (agent capacity)
A standard APW extinguisher in the United States contains 9.5 litres (2.5 US gal) of water in a stainless steel tank. The water is discharged by means of a 13 mm (1 ⁄ 2 in) hose, with a smooth-bore nozzle attached to the tip. They will initially produce a 12–15 m (40–50 ft) stream of water, with a discharge time of about 50 seconds.
They have the advantage of simple and prompt recharge, allowing an operator to discharge the extinguisher, recharge it, and return to the fire in a reasonable amount of time. Unlike stored pressure types, these extinguishers use compressed carbon dioxide instead of nitrogen, although nitrogen cartridges are used on low-temperature (–60 rated ...
Outdoors, it attaches either to a fire engine, fire hydrant, or a portable fire pump. [ 1 ] Indoors, it can permanently attach to a building's standpipe or plumbing system. The usual working pressure of a firehose can vary between 8 and 20 bar (800 and 2,000 kPa ; 116 and 290 psi ) while per the NFPA 1961 Fire Hose Standard, its bursting ...
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.
Fire extinguishers are one of the most common manual fire suppression devices and are required in all commercial buildings and vehicles. [2] Fire extinguishers can be used with little to no training and are meant for small incipient stage fires. The most common extinguisher is the ABC extinguisher and are found in most offices and homes.
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