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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.
In other words, a fast flow extinguisher expels a higher volume of agent in less time than a standard compliance flow extinguisher. As a result, fast flow extinguishers have lower UL class A&B ratings than compliance flow extinguishers (the class B numerical rating is the approximate square feet of burning fuel a novice operator could expect to ...
A typical dry chemical extinguisher containing 5 lb (2.3 kg) of monoammonium phosphate dry chemical A 10 lb (4.5 kg) stored pressure purple-K fire extinguisher An 18 lb (8.2 kg) US Navy cartridge-operated purple-K dry chemical ( potassium bicarbonate ) extinguisher
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]
Dry chemical tank capacities range from 450 to 3,000 pounds (200 to 1,360 kg). AFFF solution capacity ranges from 50 to 250 US gallons (190 to 950 L). Dry chemical flow rates vary from 5 to 8 pounds (2.3 to 3.6 kg) per second and 35 to 60 US gallons (130 to 230 L) per minute for the foam for handline application [citation needed].
For example, using a type A, B, C fire extinguisher on a chemical fire will do the opposite of what the extinguisher is supposed to do and can cause an explosion. The different types of fire extinguishers include CO 2 fire extinguishers, type A, B, or C carbon dioxide fire extinguishers, dry chemical powder extinguishers, and water-based fire ...
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