Mist Sprinkler Systems
Nationwide Fire Sprinklers now offer water mist fire suppression sprinkler installations to BS8458 (residential), BS8489 (commercial) and to other levels of suppression using the Plumis Automist systems.
We are helping this rapidly developing field of fire protection to establish safe designs and working practices to develop a practical and functional water mist fire suppression installation suitable for domestic, residential and commercial requirements.
Benefits of Water Mist Systems
These may include a lower water flow requirement where we can prove that water mist nozzles can actually perform against the fire loading. Customers should note that water mist nozzle manufacturers make certain claims about performance which when tested by independent test houses such as the BRE (see test report below) can be found to not perform as expected.
Where we can make water mist effective as a suppression system, there is a benefit in stored water volumes being reduced which helps offset the higher cost of high-pressure pumps that are required.
With the introduction of these 2 new standards from the British Standards Institute, we now have a document to measure the performance of our product against; and to give our customers the comfort of knowing their water mist installation has been designed and fitted correctly.
How Water Mist Fire Suppression Systems work
In water mist systems, water is forced through micro nozzles to form a water mist with the most effective fire fighting droplet size.
The water mist can give optimum protection by its cooling effect and also by the “inerting” or elimination of oxygen effect as water expands by a factor of 1700 when it evaporates.
Thus when water mist comes into contact with the fire – heat and oxygen, 2 of the essential ingredients of fire are much reduced or eliminated.
Less water is required in water mist systems than with conventional fire sprinklers systems.
Water mist systems are almost like the spray from an aerosol where conventional sprinklers are more like the water coming from a domestic shower.
Summary of UK Gov Building Research Establishment on commercial applications for water mist fire suppression systems
“Overall, the full-scale test results were of concern. Most water mist system arrangements were not able to provide expected levels of fire protection for the tested scenario (open plan office areas with a high ceiling). Or, in terms of the design of the tested systems, the spacing between nozzles was too great and the quantity of water discharged too low, to provide effective fire suppression.”
Recent fire trials with mist sprinkler systems
During fire trials carried out with Derbyshire fire and rescue water mist sprinklers were tested to see if they had the capability claimed to reach into concealed fires and suppress them.
The concealed fire which was shielded from the water mist head contained the fire within the cabinet and prevented the fire from developing further, and simultaneously removed heat and gasses from the room of origin, aiding tenability within that room.
Contact us to discuss your requirements for water mist fire suppression systems.