Water mist system introduced

Definition of water mist
"Mist" (water mist) is compared with the "watersprayer" (water spray) the concept of the so-called mist, is the use of a special nozzle, the water produced by high-pressure water jet particles. In NFPA 750, the mist is defined as: the minimum design pressure at 1 m from the nozzle plane, measured in the thickest part of the water mist particle diameter of not more than 1000μ Dv0.99

Particles according to the size of the water mist, water mist is divided into three, shown in Figure 1. First a mist of Dv0.1 = 100μ Dv0.9 = 200μ connection with the left part, these represent the most fine mist.

Section 2 mist, is the first one with the boundaries of mist Dv0.1 = 200μ with Dv0.9 = 400μ connection between the parts. The high-pressure water mist by nozzle fluid nozzle or nozzles produce many collisions. Because there is a larger water particles with respect to a fine mist, water mist 2 more prone to large traffic.

Section 3 is Dv0.9 mist than 400μ, or the first two water mist to Dv0.99 = 1000μ dividing line between the right part. This mist is chiefly pressure, orifice sprinklers, nozzles and other produce various shocks.
Studies have shown that the mist extinguishing Class B fires particles are less than 400μ are necessary, while the larger particles are effective for Class A fires, which is the fuel to be wetted. Because of this, water mist is defined to include the Dv0.99 to 1000μ. Defined in NFPA 750 mist, both defined in NFPA 15 includes a portion of the water pressure sprayer spraying system (Water Spray), also contains a high-pressure state in a normal spray system (Sprinklers) generated mist. Generally, the fine mist is less than 400μ Dv0.9 mist.