What is the preferred strategy for applying foam to a standing pool of fuel fire?

Using a foam stream above the burning liquid and allowing it to float down is the preferred strategy because it effectively blankets the fire with foam while minimizing the chances of disturbing the burning fuel. This method ensures that the foam can spread over the surface of the fuel, creating a vapor-suppressing layer that helps to extinguish the flames by cutting off the oxygen supply and preventing re-ignition.

Foam is designed to be effective in situations where it can create a barrier over the burning liquid. By sweeping the stream above the fire, the foam can expand and descend gently to cover the fire without displacing the burning fuel or creating a violent reaction, which can occur if foam is dumped directly onto the flames. This technique maintains control and effectiveness in suppressing the fire.

In contrast, applying foam directly onto the fire can lead to splashback or turbulence, which could exacerbate the situation rather than mitigate it. Similarly, using a high-pressure spray might break up the foam and cause it to be blown away from the fire instead of effectively covering it. Applying foam in a circular motion around the perimeter may not ensure complete coverage of the burning surface or could lead to gaps that allow the fire to continue burning. Hence, sweeping the foam from above is the most