Foam fire extinguishers work in 2 ways. Firstly, they are mainly water-based and so have the same cooling effect as water extinguishers, putting the fire out by lowering the temperature. Secondly, they contain ‘Aqueous Film Forming Foam’ (this is why they are also known as AFFF foam extinguishers).
Foam fire extinguishers are one of the most common types of fire extinguisher, and are generally used for fires involving flammable solids and liquids. Foam fire extinguishers create a cooling blanket effect, smothering burning materials and preventing re-ignition. It is not for use on chip pan fires unless they are described specifically as class F extinguishers.
What are Foam Fire Extinguishers Used for? – Industrial and …
When the fire extinguisher is activated, the water/foam solution (agent) comes in contact with the air, causing the solution to discharge as a thick foam due to the air-aspirated nozzles that are fitted on the valve assembly of every foam fire extinguisher. As the foam is sprayed onto the fire, it extinguishes the fire in two ways, 1) it cools the fire, and 2) it smothers the fire, …
A foam based fire extinguisher does obstruct a fire by: Covering the burning surface and cutting off its oxygen supply. Separating the ignited object from the source of the flame and preventing a chain reaction. Cooling all heated surfaces. Preventing the release of flammable liquids that can mix with the air.
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What fire is the foam extinguisher suitable for?
Foam extinguishers are one of the most common types of fire extinguisher. They are generally used for fires involving flammable solids and liquids. Summary: A foam fire extinguisher is a good for general use, suitable for the majority of business premises.
Which fire extinguisher is best foam or powder?
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How does a foam fire extinguisher put out a fire?
Uses of foam fire extinguisher:Fires involving flammable solids, such as paper, wood, and textiles (‘class A’ fires)Fires involving some flammable liquids, such as petrol, diesel, and paint (‘class B’ fires)Fires involving electrical appliances IF the extinguisher has passed the 35kv conductivity test
Why does a foam extinguisher put out fire?
What are the five basic fire safety practices?Check that all smoke and fire alarms are functioning properly. Ideally, you should test your fire alarms once a month and replace batteries twice a year.Have an actionable fire plan.Never leave a room with an open flame.Have at least one fire extinguisher.Embrace the cliché—Stop, Drop, and Roll.
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Fire Safety Training – How to Use a FOAM Fire Extinguisher Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher