With the exception of Class A (ordinary combustibles) fires, Class B (Flammable Liquids, C (Electrical), D (Flammable Metals) and K (Commercial Kitchen) water water will do more harm than good. is For class B, C, D, and K, the main weapon against fire …
NFPA 484 6.3.3.5 (1) specifically states that water shall not be used as an extinguishing agent on combustible-metal fires unless they are compatible with the metal because of adverse reactions and ineffectiveness. Water-based foams are not recommended because they contain water.
Why Water Cannot Be Used To Extinguish Petrol Fires?
Because water is heavier than oil, it cannot put out fires caused by burning fuel and oil. It falls below the oil particles and is unable to lower the ignition temperature of the substance or shut off the supply of oxygen to the fire. As a result, the oil on the top continues to burn.
Unlike fire extinguishers, which use water or foam to put out electrical fires, non-conductive substances must be used to put out electrical fires. Because water is conductive, anyone attempting to put out an electrical fire with something like water runs the risk of electrocution. As a result, water is not utilized to put out electrical equipment fires.
People Also Ask why water is not used to extinguish class e fire
How effective is water as a fire extinguisher?
Sometimes water can be combined with a chemical fire extinguisher to be effective. Using water on some types of fires such as metal of grease can create an explosive condition. Other than wood or paper, consult with an expert before using water on a fire.
What is used to extinguish the fire?
In general water is used to extinguish the fire there’re water based fire extinguisher system such as sprinkler , stand pipe , deluge and pre action systems. And there’re also other extinguishing systems such as clean agent system ..
Can you put out a Class K fire with water?
Using Water or CO2 will actually FEED the fire. Class K fires take place in fats and greases and cannot be fought with water but with Wet Chemical extinguishers. More information can be found at The Five Classes Of Fires & The Right Extinguisher | Strike First.
Can water put out a fire?
Water can be used to put out some types of fire. There are 5 types of fire, A, B, C, D and K. Class A fires are ordinary combustibles like wood or paper and can be fought with water, CO2, Dry Chemical, or Halon. Class B fires are flammable or combustable liquids or gasses and cannot be fought with water but need CO2, foam, Dry Chemical, or Halon.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher