Summary
High Pressure Water mist systems are fire suppression systems that use very small water droplets to extinguish or control fires. The high pressure create very small water droplets 10~1000microns by nozzles. These droplets are effective at controlling fires while using less water and having smaller piping than a standard sprinkler system due to the increased cooling effects, oxygen displacement and pre-wetting that the droplet size and distribution provide. Some additional benefits of water mist fire protection systems include reduced water damage and low environmental impact. The high pressure create very small water droplets by nozzles. The details please see NFPA 750, Standard on Water Mist Fire Protection Systems .
Application
Water mist systems are popular used for the blow applications:
- Machinery spaces
- Data Center
- Transformer
- Generator
- Industrial oil cookers
- Computer room
- Chemical Equipment Room
- Transportation(Vehicle, Ship, etc)
- Road tunnels
- Cable conduit tunnels
There are a few different ways to apply water mist fire protection systems look similar to clean agent system applications because the two systems share several commonalities in how they protect against fires.
Local Application
This configuration is used to protect a specific hazard or object. An example may be the protection of a piece of equipment in a large compartment. The system would be designed to discharge water mist directly onto the object.
Total Flooding Application
This type of system provides protection to all the enclosed hazards space. The open nozzles are positioned in a grid so that water mist discharges approximately uniformly throughout the entire volume.
Zoned Application
This type of system is configured to discharge mist from portions of a larger system as required to control fire in a specific part of a compartment. It would be installed in circumstances where the water demand for a total compartment system (i.e., a deluge system), would be beyond the capability of the water supply. Zoning the water mist piping network, however, requires the installation of a detection system that can accurately find the location of a fire.
Low Pressure System---Under 175PSI(12.1Bar)
Intermediate Pressure System---175~500PSI(12.1~34.5Bar)
High Pressure System---Over 500PSI(34.5Bar)
Now the mostly popular is the high pressure water mist fire system, especially over 10Mpa water mist system.
The Water Mist design and calculation according to NFPA750 standard and BS 8458:2015.
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