Fire systems – Systems Water Mist
Nozzles and water mist systems are one of the most innovative and promising technologies for fighting fire fire in recent years. Initially developed for fire protection systems in the shipping industry for use in the cabins of boats, passenger ferries and cruise ships, they later proved to be extremely useful and effective in many other applications and industries. In addition, the small size of these nozzles and the limited amount of water they need to operate, has made it possible to use them in new areas.
The technology of Water Mist is very simple and is based on the physical principle that a combustion process can not sustain a flame if the percentage of oxygen present in the air is less than 11%. According to this principle, in order to extinguish a fire in a closed environment it is sufficient to evaporate a limited amount of water in the air and introduce sufficient steam to reduce the percentage of oxygen below the threshold mentioned above and effectively suffocate the fire. Water mist fire protection system whilst very effective in closed rooms with little ventilation, cannot be used in external environments and open spaces.
In addition to producing water mist nozzles from our standard range and special models to suit specific customer requirements, we continue to invest in research projects and feasibility studies to develop new types of nozzles which will be even more efficient and practical.
The project that we are now studying and evaluating concerns a diffuser on which nozzles with very small orifices can be placed on its hemispherical surface with any type of configuration in order to regulate and direct the spray in the desired direction. Precisely in order to direct the jet in any direction, we have developed a new nozzle for water mist from a known principle based on the fluid dynamics of a straight jet at high speed in which the liquid is fractionated by the entrainment of air and the resistance to motion. It has been possible to produce such a straight jet using orifices of very small diameter in which the liquid is fractionated a short distance from the nozzle.