Dry chemical extinguishers put out fire by coating the fuel with a thin layer of dust, 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 fire.
Dry Powder extinguishers are filled with monoammonium phosphate, an extinguishing agent that spreads easily and melts over flames. …
How do dry chemical fire extinguishers work?
How do dry chemical fire extinguishers work? A fuel – You need some sort of combustible solid, liquid or gas. Oxygen to react with the fuel. Heat – There must be enough heat to get the fuel above its flash point. If there is paper on your desk right now, it is surrounded by oxygen, but it …
This action will release the dry chemical and expel it through the discharge nozzle. Apply the dry powder. Completely cover the burning metal with a thin layer of powder. Once control is established, take a position that is in close range. Throttle the stream with the nozzle valve to produce a soft, heavy flow.
People Also Ask how dry chemical powder extinguishes the fire
How does powder extinguish a fire?
The heat of the fire causes the dry powder to cake and form an exterior crust. This crust excludes air and results in extinguishment. It also dissipates the heat from the burning metal.
How does a dry chemical fire extinguisher work?
A dry chemical extinguisher sprays a very fine powder of sodium bicarbonate (NaHCO3, baking soda), potassium bicarbonate (KHCO3, nearly identical to baking soda), or monoammonium phosphate ( (NH4)H2PO4). These solids coat the fuel and smother the fire. Cite This! "How do dry chemical fire extinguishers work?"
How do you use a dry powder extinguisher?
Squeeze the discharge lever. Squeeze slowly and evenly. This action will release the dry chemical and expel it through the discharge nozzle. Apply the dry powder. Completely cover the burning metal with a thin layer of powder. Once control is established, take a position that is in close range.
How does sodium chloride dry powder put out a fire?
How does the sodium chloride dry powder put out a fire? The heat of the fire causes the dry powder to cake and form an exterior crust. This crust excludes air and results in extinguishment. It also dissipates the heat from the burning metal.
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DRY CHEMICAL POWDER FIRE EXTINGUISHER WHAT WHERE AND WHEN TO USE IT Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher