What foam application method is used for an ignited pool of liquid fuel located on open ground?

What foam application method is used for an ignited pool of liquid fuel located on open ground?

• A. Roll-on method
• B. Rain-down method
• C. Fogging method
• D. Venturi method

Answer: (A)

Forming a thick foam blanket directly over the pool is the most effective way to extinguish an ignited hydrocarbon pool on open ground. The roll-on method delivers foam onto the surface and immediately blankets the fuel, starving the fire of air and cooling the liquid. This direct contact with the surface provides rapid knockdown and helps prevent re-ignition by sealing the fuel on the ground. Rain-down would cover the surface from above, but it’s slower to establish a continuous blanket and can be less control-friendly for a specific pool area. Fogging creates a fine spray that cools and knocks down but doesn’t lay down the heavy blanket needed to smother a pool fire quickly. The Venturi method is a proportioning approach to mix foam with water; it describes how foam solution is generated, not the method of applying it to the fire. So, for an ignited pool of liquid fuel on open ground, rolling the foam onto the surface to form a blanket is the best approach.

Forming a thick foam blanket directly over the pool is the most effective way to extinguish an ignited hydrocarbon pool on open ground. The roll-on method delivers foam onto the surface and immediately blankets the fuel, starving the fire of air and cooling the liquid. This direct contact with the surface provides rapid knockdown and helps prevent re-ignition by sealing the fuel on the ground.

Rain-down would cover the surface from above, but it’s slower to establish a continuous blanket and can be less control-friendly for a specific pool area. Fogging creates a fine spray that cools and knocks down but doesn’t lay down the heavy blanket needed to smother a pool fire quickly. The Venturi method is a proportioning approach to mix foam with water; it describes how foam solution is generated, not the method of applying it to the fire.

So, for an ignited pool of liquid fuel on open ground, rolling the foam onto the surface to form a blanket is the best approach.