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Relatively new to the fire protection world, water mist systems are effective for certain applications. They are generally an alternative to the halogenated agents. There are three methods for distribution of water as a mist:Fixed installationIn this design, a fine mist is used to render inert a space that may be concealed or difficult to protect because of its location and geometry. Fixed nozzlesA site specific application, such as a ring of nozzles around a turbine generator set. Portable equipmentPortable water mist extinguishers are available.
There are four mechanisms by which water mist systems suppress a fire:Mist droplets, while evaporating, remove heatThis occurs either at the surface of the combustible object or within the flame itself. Fine droplets evaporateThis process generates steam, which dilutes and reduces the oxygen percentage in the air, lowering it to a point where combustion can't continue., even before reaching the flame Mist blocks radiative heat transferIf energy can't radiate between objects, or between the object and the flame on the object, the fire is suppressed. An induced gas current is developed, which promotes overall cooling
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