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 …
How does the dry chemical put out a fire? The dry chemical works by blanketing the fuel (burning materials) and interrupting the chemical chain reaction at the fuel’s surface. To a lesser extent, it dilutes the oxygen content of the air around …
How does dry chemical powder extinguish fire?
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 …
Dry Chemical Extinguishers. At USC, "ABC" fire extinguishers are filled with a fine yellow powder. The greatest portion of this powder is composed of monoammonium phosphate. ABC extinguishers are red and range in size from …
People Also Ask how does dry chemical extinguish a fire
How do dry chemical extinguishers put out fire?
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.
What is the composition of a dry chemical extinguisher?
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.
What are the advantages and disadvantages of dry chemical fire extinguishers?
What are the advantages and disadvantages of ABC, dry chemical fire extinguishers? The multi-purpose chemical, monoammonium phosphate, is corrosive and damages computers and electronic equipment. The corrosive action may be slow and not evident for several months.
How long does it take for a dry chemical extinguisher to discharge?
The approximate discharge time for 10 to 20 pounds of dry chemical ranges from 10 to 25 seconds. Once activated, can an ABC extinguisher be turned off? Yes, stop squeezing the trigger and the dry chemical stream will stop. This may be appropriate if you must reposition yourself in relation to the fire. How does the dry chemical put out a fire?
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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