Which foam application method is best for a pool of flammable liquid on open ground?

The roll-in foam application method is highly effective for addressing a pool of flammable liquid on open ground. This technique involves directing the foam directly onto the surface of the burning liquid, allowing it to roll along the surface and form a layer that suppresses combustion. It creates a solid and effective blanket of foam that seals off the vapors of the flammable liquid, thereby reducing the potential for ignition and preventing flashback that can occur during firefighting operations.

Using the roll-in method allows for more direct contact with the liquid fuel, which is crucial in extinguishing flames and preventing re-ignition. This method is particularly valuable in environments where flammable liquids can spread quickly and form large pools, as it provides an immediate barrier to vapor release.

In contrast, the rain-down, bank-down, and bounce-off methods do not provide the same level of effectiveness for this situation. The rain-down technique disperses foam from a height, which may not adequately cover a large surface area of burning liquid. The bank-down method is more suitable for operations where fires are elevated or require foam to be directed from a higher point towards the ground. The bounce-off method can lead to foam rebounding away from the target area, which might not result in proper foam application