Which type of system is the AFFF system primarily designed to combat?

The Aqueous Film Forming Foam (AFFF) system is specifically engineered to combat flammable liquid fires, which are typical in environments where hydrocarbons or other flammable liquids are present. AFFF works by creating a film on the surface of the burning liquid, effectively smothering the flames and preventing the release of flammable vapors. Its formulation allows it to quickly spread over the surface, providing a barrier that cuts off the oxygen supply, which is essential in extinguishing such fires.

While AFFF systems are particularly effective against flammable liquid fires, they are not designed for electrical fires or gas fires. Electrical fires require specific extinguishing agents that can safely interrupt the electric current, and using water or foam (like AFFF) on them can pose a danger of electrical shock. Gas fires, on the other hand, often require different extinguishing strategies as they involve a combustible gas that necessitates the stopping of the gas flow or using agents that can eliminate the presence of the gas itself.

Understanding the unique properties and applications of AFFF highlights its specialized role in fire suppression, reinforcing why flammable liquid fires are the primary fire type it is designed to combat.