Which foam application technique is used when a vertical surface is near the fuel?

The bank-down method is specifically designed for use when dealing with fires near vertical surfaces, such as walls or tanks. This technique involves applying foam at an angle so that it flows down over the surface, effectively creating a seal that prevents the vapors from the fuel from escaping. This method ensures that the foam adheres to the vertical surface, providing an effective barrier against combustion and reducing the chances of ignition or re-ignition of the fuel.

When using the bank-down method, the operator tilts the nozzle so that the foam lands on the surface and then cascades down towards the fuel. This is particularly advantageous in scenarios where the fuel is situated right next to a wall or vertical object because it helps to protect those surfaces as well as effectively suppress the fire.

Other techniques mentioned may not be suitable for this scenario. For instance, the roll-on method is typically used for horizontal surfaces, while the sweep method involves moving the foam in a side-to-side motion rather than targeting a vertical surface specifically. The aerial drop method is generally utilized from a height and is more suited to large, inaccessible areas, making it less effective for managing fires near vertical structures. Understanding the applications and limitations of these foam application techniques is crucial for effective fire suppression strategies.