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Definition of Water Mist

Water mist is determined by the droplet sizes in the spray. The definitions in standards specify that 99% of the droplets have to be less than 1000 µm in diameter. 
 
Water mist systems are further distinguished by the pressure used to generate the water mist. Today, users of the technology aim for droplets of water with sizes between 20 and 200 µm, since these have been found to be most advantageous in fighting fires. 
 
In some special applications, even larger droplets are desired if full surface cooling is the aim.
Smaller droplets are more effective gas phase since they stay longer suspended in the air, thus have more interaction with the fire.

Effective Fire Protection with Water Mist Technology

FOGTEC water mist consists of tiny water droplets for firefighting

Optimum droplet spectrum due to high pressure between 50 and 200 bar

Vaporisation of the droplets enables maximum cooling effect with minimum water consumption

Water vapour displaces the oxygen at the source of the fire and suffocates the fire

Localised oxygen displacement and high cooling effect secure escape routes and protect people

Minimising the use of water protects equipment and buildings from damage and long downtimes

Cooling effect

The atomisation of water generates a massive reaction surface area and therefore results into extremely efficient cooling. Energy is extracted rapidly and effectively from the fire. The cooling effect also protects people and property from the effects of radiated heat. By using the droplets’ shielding effect to reduce heat radiation, effective water mist shields can be generated for persons escaping from the fire and for the rescue teams as well as for components, wall openings, facades, etc. 

Oxygen displacement effect

The rapid vaporisation of water droplets extracts energy from the fire. The water vapour, which has a volume 1640 times greater than liquid water, displaces the oxygen directly at the fire source, thereby creating a suffocation effect similar to an extinguishing gas. This only occurs directly at the fire source, meaning there is no danger to people escaping from the fire due to a lack of oxygen. Traditional water based firefighting systems (e.g. low-pressure water mist systems) use larger droplets, which take considerably longer to vaporise or do not vaporise at all. 

Technology

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