What is foam system fire extinguishing mechanism?
It forms a stable foam blanket which spreads above the fuels and adheres to surfaces. Some types of foam forms a film above the fuel surface and seals vapours. The use of fire fighting foam concentrate prevents fuel contact with oxygen, resulting in fire suppression.
What is foam type fire extinguisher?
3. Foam Extinguisher – Chemical and Mechanical. Chemical foam extinguisher – The chemicals used in this foam type fire extinguisher are sodium bicarbonate and aluminium sulphate. The main container is filled with sodium bicarbonate, whereas the inner container is filled with aluminium sulphate.
What is mechanical foam type fire extinguisher?
Mechanical Foam – Portable (Stored Pressure) Extinguishes fire by blanketing, displacement of air and decomposition of dry powder effects. These fire extinguishers contain Sodium Bi-carbonate based dry powder as per IS 4308 or Mono Ammonium Phosphate based Powder as per IS 14609.
What is the function of foam fire extinguisher?
What is a foam fire extinguisher used for. AFFF (Aqueous Film Forming Foams) Foam Fire Extinguishers are suitable to fight burning solids such as wood as well as liquid fires such as burning petrol. The foam has the ability to creep over the burning liquid or to soak into burning materials such as settees.
What does 3% AFFF mean?
CHEMGUARD C3B 3% AFFF (Aqueous Film-Forming Foam) Concentrate combines fluoro- and hydrocarbon-surfactant technologies to provide superior fire and vapor suppression for Class B hydrocarbon fuel fires. The water content of the foam solution produces a cooling effect for additional fire suppression.
Where is foam system used?
Areas of application: In general, foam can be used anywhere that water alone would not have the desired extinguishing effect or the use of gas extinguishing systems or water mist systems would not be effective. Its largest area of application is therefore for combustible and highly flammable liquids.
When should you not use a foam fire extinguisher?
Foam extinguishers are also safe for use on flammable liquid fires. They CANNOT be used on electrical fires or flammable metal fires as this extinguisher could end up exacerbating the fire.
What do you not use a foam fire extinguisher on?
The foam extinguishes liquid fires by sealing the surface of the liquid, preventing flammable vapour reaching the air and starving the fire of fuel. They are not suitable for use on free flowing liquid fires.
Which is used as fire extinguisher?
Three types of extinguishing agents are typically used—carbon dioxide, dry chemical, and foam water for fires involving flammable liquids, greases, and oils. Carbon dioxide is a compressed gas agent that prevents combustion by displacing the oxygen in the air surrounding the fire.
Does AFFF expire?
If kept in the original unopened and airtight Chemguard supplied container and stored within the temperature range of 35ºF – 120ºF (2ºC – 49ºC) a shelf life of between 20-25 years can be expected.