What is the best method to extinguish Delta fires?

The best method to extinguish Delta fires involves using water in large quantities in high-velocity fog. Delta fires refer to fires involving certain types of non-polar flammable liquids such as gasoline, oil, and solvents. These fuels can create a floating layer of combustible material on water, making it essential to approach extinguishing them with caution.

Using water in large quantities helps to displace the flammable liquid, potentially cooling the fuel and reducing the fire's intensity. When applied as a high-velocity fog, the water droplets can create a barrier that reduces the amount of oxygen reaching the flames while also cooling the surrounding area. This method is effective because it can help to control the fire's spread and prevent re-ignition, especially in situations where conditions may allow the flammable liquid to reform a hazardous vapor.

The other methods listed may not effectively deal with the complexities presented by Delta fires. Carbon dioxide is generally ineffective on liquids that can float on water, while Halon involves a specific suppression mechanism that may not be ideal for these types of fires. Dry chemical powder can be used in some cases but may not have the same cooling effects and the ability to address a large surface area as effectively as water in a fog form. This makes the use