Water Mist

Ultra Fog water mist fire extinguishing systems provide robust, effective, quality engineered solutions for applications which require optimal fire suppression while minimising the volume of water consumed and deployed. High pressure pumps force water through the stainless steel Ultra Fog water mist nozzles, discharging the water in the form of millions of tiny droplets – typically 30 – 200 µm diameter.

An activated system will create a blanket of water mist droplets which maximise heat absorption from the fire, and subsequently displacing oxygen upon evaporation and expansion of the water mist as it converts to steam.  Water mist systems are differentiated from sprinkler systems by mist’s unique ability to present a much greater water surface area (enabling rapid heat absorption), combined with the mist’s ability to remain suspended in the air for a much longer duration – thereby creating more exposure time for the heat absorption to take effect.  This enables water mist systems to cool and suppress fire using considerably less water than sprinkler systems.
Water mist fire protection systems provide absolute protection for all kinds of enclosures. This occurs because the nebulised droplets, along with the oxygen present in the enclosure, constitute the base of a fire. When the water mist turns into steam (that is expanding in volume, it forces oxygen for continued combustion away from the flame. The total protection effect achieves a quick wetting and cooling of the burning surface.

Technical comparison between deluge, low pressure and high pressure water mist

Water consumption density 10.2 - 25 lpm/m² (2.7 - 6.6 gpm/ft²) 2.2 - 5.0 lpm/m² (0.6 - 1.32 gpm/ft²) 0.9 to 1.65 Lpm/m²
Nominal zone water flow l/m²
(25 m x 12 - 18 m, 82 ft x 39 - 60 ft)
3060 - 9180 lpm/m² (808 - 2425 gpm/ft²) 660 - 1300 lpm/m² (174 - 343 gpm/ft²) 270 to 495 lpm
Water reservoir for 1 hour with 3 zones
active (75 m, 246 ft tunnel protection)
550 - 1450 m³ (19250 - 50750 ft³) 119 - 235 m³ (4165 - 8225 ft³) 48 to 89 m³
Water pressure nozzles and at pumps Nozzles: 1.1 - 2.5 bar (15.9 - 36.2 PSI)
Pumps: 6 - 8 bar (87 - 116 PSI)
Nozzles: 10 bar (145 PSI)
Pumps: 15 bar (217 PSI)
Nozzles: 55 to 65 bar
Pumps: 85 to 100 bar
Riser pipe in 2 km (1.2427 mi) tunnel 250 - 600 mm pipe (10” - 24”) 125 - 150 mm pipe (5” - 6”) 65 to 80mm
Power need for pump 132 - 250 KW 78 - 112 KW 115 to 115 to 250 kw
Share riser pipe water supply with hydrants Yes (optional) Yes (optional) Yes as option, high pressure hydrant
Share fire waterpumps with hydrants Yes (optional) Yes (optional) Yes as option, high pressure hydrant

The triangle-based formula for extinguishing fire also prevents from a probable re-ignition. The system absorbs in an efficient way and removes smoke and other toxic substances left after the fire occurred, another feature that is not possessed by traditional fire protection options. Of course, the degree to which smoke and gases are absorbed and removed depends on the specific system design, parameters applied, and on the volume and chemical composition of the burnt material. The specific design objectives of water mist are fire control, temperature control, exposure protection, suppression, and extinguishment. Fire is simply not sustainable without heat and oxygen.

Small pipe dimensions mean light weight and easy to install. High-performance stainless-steel nozzle can cover up to 48 square meters. Wider nozzle spacing means less labor and installation costs. Consider the ultimate Ultra Fog nozzles are the only ones that can be tested without breaking the frangible glass bulb thanks to the patented nozzle test tool.