Fogmaker, Sweden, has developed a method that suppresses with the help of three basic mechanisms. The high pressure in combination with special nozzles creates microdroplets with an average size of 50 μm. In the evaporation process the watermist cools the burnt gases and hot parts in the engine compartment. One calorie is needed to warm one gram of water +1°C, but 540 times more to evaporate the same quantity of water from + 0°C to vapour. The effective cooling contributes to a rapid extinguishing and reduces the risk of re-ignition.
The microdroplets evaporate immediately upon contact with heat. In the evaporation, 1 litre of water forms 1700 litres of water vapour. The vapour increases the water content of the air and prevents a new supply of oxygen to the fire. The Fogmaker extinguishant also includes a low concentration, environmentally friendly AFFF (Aqueous Film Forming Foam) coating the fuel, preventing its contact with oxygen, resulting in suppression of the combustion. Contact: Fogmaker International AB, Sandvägen 4, Box 8005, SE- 350 08 Växjö. Tel: +46 470-77-2200; Fax: +46-470-77-2210; E-mail: info@fogmaker.com.
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High pressure water mist system
VATIS UPDATE Part
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