How do foam extinguishers work? 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).
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 …
Foam fire extinguishers and how they are use – HSEWatch
AFFF works by smothering the fire and sealing in the flammable vapours. This prevents the fire re-igniting. It also allows foam fire extinguishers to put out flammable liquid fires, by creating a barrier between the liquid’s surface and the flames. Advantages & Disadvantages of foam fire extinguishers: Advantage:
A foam type fire extinguisher works two ways. First the foam deprives the fire of oxygen. This is why It can be used on a Class A fire as well. Secondly as the foam breaks down it forms a film at the surface of the flammable liquid. This controls the release of flammable vapors.
People Also Ask how does a foam fire extinguisher put out a fire
How do foam extinguishers put out fires?
To understand how foam extinguishers put out fires, we need to know how fires burn in the first place. There are four elements to a burning flame: heat, fuel, air or oxygen, and a chemical chain reaction. Interfering with any of these elements can stop the fire.
Is it safe to consume the foam from a fire extinguisher?
Because of certain safety risks that are associated with consuming the residue of the foam from a fire extinguisher, make sure you adhere to the following protective measures:
What is the difference between water and foam fire extinguishers?
They are mainly water-based and so have the same cooling effect as water extinguishers, putting the fire out by lowering the temperature. They contain ‘Aqueous Film Forming Foam’ (this is why they are also known as AFFF foam extinguishers).
How do you use a fire extinguisher on a liquid?
Where the liquid on fire is contained, point the extinguisher at the inside edge of the container. If it’s not contained, spray with a gentle, sweeping movement across the TOP of the fire, or against an adjacent surface. This way the foam will drop down and settle on the top of the burning liquid.
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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