what is fire?. a chemical reaction that involves the evolution of light and energy in sufficient...
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What is Fire?
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What is Fire?
A chemical reaction that involves the evolution of light and energy in sufficient amounts to be perceptible.
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What are the ingredients needed to make fire?
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What are the ingredients needed to make fire?
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What are the ingredients needed to make fire?
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What are the ingredients needed to make fire?
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What are the ingredients needed to make fire?
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What are the classes of fire?
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What are the classes of fire?
“A”, “B”, “C” “D” “E” & “K”
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Class “A” fire
• Classification of fire involving ordinary combustibles such as wood, paper, cloth, plastics, and rubber.
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Class “B” fire.
• Classification of fire involving flammable and
combustible liquids, gases, and greases. Common
products are gasoline, oil, alcohol, propane and
cooking oils.
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Class “C” fire.
• Classification of fire involving energized electrical equipment, where the electrical nonconductivity of the extinguishing media is of prime importance.
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Class “D” fire
• Classification of fire involving combustible metals and alloys such as magnesium, sodium, lithium and potassium.
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Class “E” fire• Classification of fires involving
nuclear materials. Due to radioactive contamination, smoke from fires involving nuclear materials may produce more harm than the fire itself.
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Class “K” fire• Classification of fire that involves fires in combustible cooking fuels such as vegetable or animal oils and fats. In the kitchen
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Fire Extinguishers
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Class “A”
• Water is used in a cooling or quenching effect to reduce the temperature of the burning materials below its ignition temperature.
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Class “A”
• Water can also be used to suffocate the fire by creating steam which displaces the oxygen needed for combustion.
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Class “B”
• The most effective method of extinguishing this type of fire is to smother with foam or to remove the fuel.
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Class “B”
• Another method of extinguishing is temperature reduction which can be accomplished by applying water fog.
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Class “C”
• These fires can sometimes be controlled by a non-conducting extinguishing agent such as Halon, dry chemical, or carbon dioxide.
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Class “C”
• The safest method of control is to first de-energize the circuit then treat as the class of the fuel involved.
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Class “D”
• There is no single agent that will control or extinguish fires in all combustible materials.
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Class “D”
• Water is ineffective and may in fact cause more harm. Hitting some class “D” fires with water will cause them to explode and burn hotter.
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Class “D”
• Certain metals will continue to burn until they have exhausted the fuel supply.
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Ratings of Fire Extinguishers
Class “A” and “B” extinguishers are rated by the size fire they should be able to put out.
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Ratings of Fire Ratings of Fire ExtinguishersExtinguishers
Class “C” and Class “D” extinguishers are only labeled for the materials they extinguish.
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Ratings of Fire Extinguishers
• Class “D” extinguishers are also labeled to indicate the specific metal they are to be used on.
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Ratings of Fire Extinguishers
• Class “A” ratings are 1A to 40A.
• A 1A extinguisher contains 1 ¼ gallons or 5 L of water… A rating of 2A contains 2 ½ gals or 10 L
• A dry chemical extinguisher with a 10-A rating is equivalent to five 2 ½ gal. extinguishers.