Fire Fighting

Water mist fire fighting systems – how it works

Water Mist Technology

Why is water mist so effective in fighting fires? When extinguishing a fire, water mist produces a higher rate of heat extraction and at the same time uses less water.

Water mist has a central advantage over the conventional water jet, in that the mist can penetrate everywhere and thus cool and extinguish very efficiently. This is how it works: the turbine atomizes water into a fine mist. When compared to conventional monitors (nozzle technology), firefighting turbines produce droplets of smaller size, which are then distributed by propellers. The advantage of such smaller droplets is that they create a larger water surface and can, therefore, form a larger surface area to transport heat. The fine mist also has a lower sedimentation speed and can envelop the burning object. It can often even reach into hidden sources of fire that cannot be reached with traditional hoses.

The water mist allows more heat to be extracted from the source of the fire and the cooling effect has a very positive direct impact on the ambient temperature. Water mist also quickly binds and precipitates smoke and particles of soot.

The use of the turbine also allows the distance over which the water mist is distributed to be increased many times over, even at low water pressure. The firefighting turbine also operates with water, foam or a mixture of water and foam.

We offer the following solutions

Firefighting and fire protection with water mist

An optimal cooling effect can be achieved either by forming a barrier, through direct application and by an even distribution on the surface of the object being cooled. Water mist is excellent as an extinguishing agent, thanks to the high cooling effect of directly applying the atomized water straight onto the flame. 

Advantages of water mist

The fine drops bind very well with the smoke and soot particles and bring them down to the ground. At the same time, the consumption of water is significantly less than other systems, for example, sprinkler systems. In summary, this system is very efficient because it can cover a more significant surface area with water while consuming less. The water mist fights fire, heat, and smoke more efficiently.

Water mist can be used to fight fires in the following areas

Fields of Application

In practice, the potential range of applications for our firefighting turbines is very extensive. It covers everything from the chemical sector (where firefighting often includes dealing with pollutants) to recycling plants, companies with a high fire load (such as aircraft hangars, tank farms or refineries, industries that work with timber, etc., or high voltage units.

How water mist works

Working Principles

When water mist is used, it generates several other extinguishing effects that destroy the conditions necessary for fires to burn, and/or which can result in neutralizing the actual combustion.

1. Heat extraction
The large water surface formed by the small droplets creates the conditions for an optimal exchange of energy between the water mist and the surrounding area. When the water droplets come into contact with the fire, they extract the heat until they evaporate. Of all known extinguishing materials, water has the highest evaporation enthalpy (2442 J / g).

2. Inerting effect
The water mist is drawn into the fire by the air, where due to the high heat, it quickly evaporates. Due to the enormous increase in the volume of the water droplets as they evaporate, the oxygen is displaced at the source of the fire, and the fire is extinguished.

Additional positive side effects are the precipitation of gas, the leaching of smoke and gas, the increased safety for fire crews and personnel (because water mist lowers temperatures faster than any other medium, neutralizes the effect of smoke and cools down the objects.

TAF = Turbine Aided Firefighting

Video

A test carried out by the MPA Dresden at the MOL refinery training ground in Hungary showed the effectiveness of the Turbine in extinguishing and cooling fire. The firefighting turbine was tested over an area of 160 m2 with 2,400 liters of gasoline that were set on fire (350MW HHR - 1% AFFF foam). This test is the most extensive documented fire test with water mist in Europe. 

In principle, our firefighting turbines work with water, foam or a mixture of water and foam. Depending on the spray pattern, the water input can be varied between 100 and 4,700 liters per minute.