Water mist fire protection systems
Water mist is a system for fire control. It consists of optimising the water’s properties by splitting it into microdrops and giving them with sufficient energy to penetrate the fire, enhancing their extinguishing capability.
It arose in 1996 when the National Fire Protection Association (NFPA) published the standard on Water Mist Fire Protection Systems, NFPA 750.
The water mist industry and technology are governed by this standard and designs and facilities have to be made in accordance therewith, taking into account the guidelines and design of the manufacturers, the approval of the companies, the competent authorities and other special instructions such as those of the International Maritime Organization (IMO).
Their effectiveness is based on the combined result of three different actions:
- Cooling by absorption of heat when the water vaporizes.
- Attenuation of the heat transmission by radiation.
- Displacement of Oxygen at the fire source, by the evaporation effect.
There is a range of sprinklers for spraying water that allow us to easily select the most appropriate model for each risk.
The sprinklers are manufactured in stainless steel, AISI 304, and designed for a working pressure of 280 bar.
In the open sprinklers the discharge takes place directly, when the water reaches them. In the closed version, the discharge only takes place when the bulb (fusible) of the seal reaches the temperature for which it has been calibrated. This sprinkler is the appropriate version for wet or preaction systems.
The flow from the sprinklers is a function of the nozzle model and number, it being possible to select the flow from 0.600L/minute up to 36L/minute with a pressure of 120 bar.
All the sprinklers for fixed facilities have the same thread and the same water-tightness system. An adapter is used for securing the sprinkler to the pipe, between the pipe fitting and the sprinkler.