Which foam application technique is described as bankdown/bounce-off?

Which foam application technique is described as bankdown/bounce-off?

• A. Sweep method
• B. Bankdown/bounce-off method
• C. Rain-down technique
• D. Roll-on technique

Answer: (B)

Bankdown/bounce-off uses a low-angle foam stream aimed at a surface so the foam banks on that surface and then bounces onto the fuel below, creating a rapid, wide foam blanket. This approach lets foam cover the target area with less direct contact and can reach around angles or into spaces that aren’t easily sprayed directly. The idea is to let the foam hit a nearby surface, rebound, and lay down a protective, cooling layer over the fuel, which helps suppress vapors and slow the fire. In practice, you’d keep the nozzle near ground level or against a surface and deliver a steady foam flow with enough energy to produce that bounce without blowing the foam away. The result is a blanket that coats the surface quickly and evenly, making it effective for spills and horizontal surfaces where a direct hit would be harder to achieve. This differs from the rain-down method, where foam is dropped from above to blanket the area; from the roll-on technique, where foam is actively rolled across a surface to form a film; and from the sweep method, which relies on broad, sweeping motions to distribute foam over an area.

Bankdown/bounce-off uses a low-angle foam stream aimed at a surface so the foam banks on that surface and then bounces onto the fuel below, creating a rapid, wide foam blanket. This approach lets foam cover the target area with less direct contact and can reach around angles or into spaces that aren’t easily sprayed directly. The idea is to let the foam hit a nearby surface, rebound, and lay down a protective, cooling layer over the fuel, which helps suppress vapors and slow the fire.

In practice, you’d keep the nozzle near ground level or against a surface and deliver a steady foam flow with enough energy to produce that bounce without blowing the foam away. The result is a blanket that coats the surface quickly and evenly, making it effective for spills and horizontal surfaces where a direct hit would be harder to achieve.

This differs from the rain-down method, where foam is dropped from above to blanket the area; from the roll-on technique, where foam is actively rolled across a surface to form a film; and from the sweep method, which relies on broad, sweeping motions to distribute foam over an area.