How foam fire extinguishers works: Foam fire extinguishers work in 2 ways. 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). AFFF works by smothering the fire and …
Foam fire extinguisher uses: • 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.
How does a Foam Fire Suppression System Work?
The “foam” in foam fire suppression systems is an extinguishing agent that can extinguish flammable or combustible liquid by …
HOW FOAM EXTINGUISHES A FLAMMABLE LIQUID FIRE: Fire burns because there are four elements present. These elements are heat, fuel, air (oxygen) and a chemical chain reaction. Under normal circumstances if any one of the elements is removed/interfered with, the fire is extinguished. Fire fighting foam does not interfere in the chemical reaction.
People Also Ask how does foam extinguish flammable liquid fires
How does aqueous foam extinguish a flammable fire?
Unlike other extinguishing agents – water, dry chemical, CO 2, etc., a stable aqueous foam can extinguish a flammable or combustible liquid fire by the combined mechanisms of cooling, separating the flame/ignition source from the product surface, suppressing vapors and smothering.
Can I use a foam extinguisher on an electrical fire?
Please note: foam extinguishers are not explicitly designed for use on electrical fires.
Does fire fighting foam interfere with the chemical reaction in fire?
Fire fighting foam does not interfere in the chemical reaction. Foam works in the following ways: The foam blankets the fuel surface smothering the fire. The foam blanket separates the flames/ignition source from the fuel surface.
How do I identify a foam fire extinguisher?
How to identify a foam fire extinguisher: • CREAM coloured label printed on the body stating ‘Foam’ • Should be identified by an extinguisher ID sign fixed nearby – ‘Foam Extinguisher’ Sizes of foam fire extinguisher available:
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How Foams Extinguish Fires Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher