Provide the advantages and disadvantages of fire extinguishers, dry powder extinguishers, and foam extinguishers
Very simple. Foam can only destroy solid fire and oil fire. Other fire won't go out. The general fire brigade uses this fire.Dry powder BC can only destroy liquid fire, gas fire and appliance fire. A solid fire cannot be destroyed. Obsolete products.Dry powder ABC is commonly known as a small universal fire extinguisher. You can destroy the fire in your life. Such as solid fire, liquid fire, gas fire and electric fire.
The common dry powder, also called BC powder, is used for fighting liquid and gas fires, and is not applicable to solid fires. Use dry powder or ABC powder, can be used for extinguishing solid, liquid and gas fire, in addition to carbon dioxide extinguishers, mainly applicable to all kinds of flammable and combustible liquids, flammable gas fire, also can be the beginning of the fire fighting instruments, books and archives, and process for low-voltage electrical equipment etc.. If there's anyone else, don't use it.
Mainly used in various oil fire fighting foam, wood, fiber, rubber and other solid combustible fire. Fire extinguisher is to use carbon dioxide or nitrogen for power, will be ejected from the nozzle to form a dry powder, mist of powder flow, fire burning material at.
Dry chemical extinguishing agent:A dry, easily flowing fine powder used in extinguishing fires consisting of an inorganic salt with a extinguishing effect and a small amount of additive. Extinguish fire by chemical inhibition and asphyxiation. BC dry powder and ABC powder are divided into two categories.The dry powder extinguishing agent mainly fires by the physical and chemical action occurring when the powder mist is sprayed with the flame and is mixed with the flame under the action of the pressurized gas. Is a free radical or radicals generated by burning material of inorganic salt powder in the volatile decomposition and combustion process in chemical inhibition and negative catalytic effect, the chain reaction of combustion and extinguishing interruption is by two; dry powder into combustible surface, producing chemical reaction, and the formation of the under the action of high temperature cover layer, thereby isolating oxygen smothering. The main drawback of dry powder extinguishing agents is that it is easy to pollute the precision instruments.
