Which technique involves rolling foam onto the surface to create a dense blanket directly on the liquid?

Which technique involves rolling foam onto the surface to create a dense blanket directly on the liquid?

• A. Sweep method
• B. Roll on technique
• C. Drizzle-on technique
• D. Blitz technique

Answer: (B)

Filling the surface with foam to form a stable blanket is the goal when fighting liquid-fuel fires. The roll-on technique achieves this by directing foam so it rolls across the surface, building a dense, continuous layer directly on the liquid. That rolling action puts foam right where it’s needed, creating a cohesive blanket that blankets the fuel, slows or stops vapor release, and cools the surface quickly. It’s especially effective for large spills or smooth surfaces where you want even coverage rather than a thin, scattered layer. Other methods spread foam differently—one uses sweeping motions to spread, another drizzles foam in lighter coats, and another floods quickly without forming a dense surface blanket—so none of those achieve the same immediate, uniform surface layer as rolling foam onto the liquid.

Filling the surface with foam to form a stable blanket is the goal when fighting liquid-fuel fires. The roll-on technique achieves this by directing foam so it rolls across the surface, building a dense, continuous layer directly on the liquid. That rolling action puts foam right where it’s needed, creating a cohesive blanket that blankets the fuel, slows or stops vapor release, and cools the surface quickly. It’s especially effective for large spills or smooth surfaces where you want even coverage rather than a thin, scattered layer. Other methods spread foam differently—one uses sweeping motions to spread, another drizzles foam in lighter coats, and another floods quickly without forming a dense surface blanket—so none of those achieve the same immediate, uniform surface layer as rolling foam onto the liquid.