Water mist technology is based on small droplets, creating a comparatively large surface. Therefore, an enormous cooling effect is achieved. The fire is not only suppressed, in fact, the surrounding area is cooled down and radiant heat is absorbed partly.
Optimizing the system pressure with focus on technical and economical aspects is also within the scope of SOLIT. Compared to conventional deluge systems, high system pressure is a result of economic and technical studies. For future installations small pipe diameters, and therefore, more cost-saving installations can be realized as well, pressure losses in long pipes can be compensated easily.
Water mist nozzles are installed throughout the whole tunnel and divided into sections. They are connected via remote controlled section valves with a main water supply line routed through the tunnel. Therefore, time between start signal and full activation of the water mist system can be shortened.

Principle Layout of a Water Mist System

In case of fire, it will be detected and located by a fire detection system. It is of vital importance to choose the right detection system and to integrate it in the appropriate way. After detection, the corresponding sections are activated manually or automatically by opening the section valves and by starting the supply pumps.

Water Mist nozzles in the tunnel
The influence of ventilation can be seen