Watermist systems distribute very small droplets of water to create the maximum cooling effect on a fire. Such systems are based on the well established principles of hydraulic technology. The water is stored in tanks or cylinders and pipes take the water to areas where it might be needed. Spray heads discharge the water in the form of water mist. The tiny droplets create a large effective cooling surface area of the fire and surrounding volume. The high speed of the droplets means they can penetrate the hot fumes and reach the combustion area. If water is unsuitable (usually due to its electrical conductivity) then a foam agent may be added.
Watermist systems work in 3 complimentary ways:
Watermist systems can be used for Total Flooding (where the growth and spread of the fire is limited, adjoining fuel is cooled and upper gas temperatures are contained) and Local Application (where there is complete fire suppression of the risk).