Low pressure water mist -
the modern approach in firefighting industry
Technical article - April 2022
These factors may be, on the one hand, the water mist spray characteristics such as distribution of droplet size; flux density, expressed as the amount of water released per unit volume / area per minute; spray dynamics, expressed in the speed and trajectory of the droplets. On the other hand, it is necessary to take into account the specific fire scenario (geometry of the room, type and size of flammable materials, ventilation conditions, ambient temperature, etc.). Factors such as enclosure effect, dynamic mixing created by the discharge by a group of nozzles, also affect the performance of water mist systems.
Due to this complexity of the fire extinguishing process, the relationship between the fire scenario and the characteristics of the system is not unambiguous, but very complex. Neither the droplets size nor the operating pressure determine the effectiveness of the system. Only full-scale fire tests prove whether a system can handle a certain risk.