Fire extinguishers 101.

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Presentation transcript:

Fire extinguishers 101

What is fire? Fire is the visible effect of the process of combustion – a special type of chemical reaction. It occurs between oxygen and some sort of fuel. The products from the chemical reaction are completely different from the starting material.

Theory of fire: THE FIRE TETRAHEDRON Four elements must be present for fire to occur: Fuel Heat Oxidizing agent (oxygen) Chemical Chain Reaction Take away any of these and the fire will be extinguished

Fire extinguishers Fires are classified according to the type of fuel that is burning. If you use the wrong type of extinguisher on the wrong class of fire, you might make matters worse It is very important to understand the fuel classifications.

Fire classifications

Water extinguishers Designed for class a fires only Using water on a flammable liquid fire could cause the fire to spread Using water on a electrical fire increases the risk of electrocution

CO2 extinguishers Co2 fire extinguishers are designed for class b and c fires only The pressure in a Co2 is so great, bits of dry ice may shoot out of the horn

Dry chemical extinguisher Dry chemical extinguishers come in a variety of types. You may see them labeled: DC (for dry chemical) ABC (can be used on class a, b, or c fires Bc (can be used on class b and c fires

Class k extinguishers Used on oils and greases Agents use saponification to turn fats and oils into soapy foam that extinguishes the fire Usually only found in commercial cooking operations ONLY USE A CLASS K EXTINGUISHER AFTER THE HOOD SUPRESSION SYSTEM HAS ACTIVATED

Anatomy of a extinguisher

Use of a extinguisher Call 911 or activate nearest fire alarm Verify the extinguisher is rated for the proper classification of fire Pull the pin Aim the extinguisher at the base of the fire Squeeze the handle Sweep side to side

Rules for fighting fires Know what is burning. If you don’t know what’s burning you won’t know what kind of extinguisher to use Even if you have an abc extinguisher, there may be something in the fire that may produce toxic fumes and/ explode. Is the fire spreading rapidly beyond it’s point of origin? Is so evacuate immediately.

Reporting fires Activate Building fire alarm system Evacuate the building Call 911