Which method is commonly used to extinguish flammable liquid fires?

The method of extinguishing flammable liquid fires is commonly accomplished through foam application. This approach is effective because foam can create a barrier between the fuel and the air, which is essential in the fire triangle that consists of fuel, heat, and oxygen. By smothering the fire, foam minimizes the presence of oxygen and cools the burning liquid, thus interrupting the combustion process.

Foam is particularly suited for flammable liquid fires because it adheres to the surface of the liquid, preventing the vapors from escaping and sustaining the fire. This quality is critical, as flammable liquids often burn on their surfaces and release vapors that can ignite.

In contrast, while water can be used in certain situations, it is often not recommended for flammable liquids due to the risk of spreading the fire, especially with liquids that are lighter than water. Dry powders and carbon dioxide are effective in specific scenarios but are generally not as effective as foam for establishing a suppression barrier for flammable liquids. Foam's comprehensive suppression capabilities make it the preferred method for these types of fires.