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, effectively sealing up the fire which prevents the vapors of the flammable liquids from coming in contact with the oxygen in the air, in essence the foam smothers the fire.
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:
Fire Streams (FOAM) Flashcards | Quizlet
What are the 4 ways that foam extinguishes/prevents fire? 1. Separating 2. Cooling 3. Smothering 4. Penetrating. Separating. Create a barrier between fuel and fire. Cooling. … Uses external pump or head pressure to force foam into the fire stream. Batch Mixing method. Mix foam in the fire truck tank. What proportioning method is the simplest …
Foam extinguishes flammable or combustible liquid fires in four ways (see fig. 1 below): a) Excludes air from the flammable vapours. b) Eliminates vapour release from fuel surface.
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Fire Extinguisher Types | Foam Spray Extinguisher | iHASCO Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher