Over the last decade, the water mist fire suppression system has been used to replace current fire protection techniques no longer deemed environmentally acceptable, such as halons, or to provide new answers to problems where traditional technologies have not been effective. Let’s understand in detail how a water mist suppression system works.

When a fire is detected by the water mist fire suppression system, the system emits water mist that starts the heat extraction on the surface area of the droplets.
The size of the droplet keeps on reducing, which increases the surface area.
The increased surface area enables more cooling down effect.
The water droplets then convert into vapour and expand up to 1650 times, thereby diluting the oxygen and cutting out the fuel source.
As the heat from the fire is high, the vaporization takes place faster.
The direct impact of the water droplet improves the fire suppression process.
The mist expands and cools off the fuels, which eventually contains the fire from spreading.
The water mist fire suppression system is completely dependant on its spraying characteristic. This characteristic includes the size of the droplet, the flux density, and the spray dynamics. These factors also depend on the size of the fire and the type of ventilation available in the premises.

Common Application of Water Mist Suppression System

Water mist fire suppression technology has been used or is being developed for the extinguishment of Class B spray and pool fires in shipboard machinery and engine room spaces; the extinguishment of Class A fires in shipboard accommodation spaces and heritage property (wood stave churches, libraries); the extinguishment of Class C fires in computer and electronics equipment; as well as to provide fire protection for the aircraft onboard cabin and cargo compartments, engine dry bays and fuel tanks [4-8]. The applications of water mist fire suppression technology in other areas, such as portable water mist fire extinguishers or use in commercial cooking areas, are also being developed.

Classes of Fire Industries

Class A

Marine Accommodations
Residential Occupations
Heritage Buildings and Library

Class B

Machinery Spaces
Turbine Enclosures
Combat Vehicles
Some Flammable Liquid Storage Rooms

Class C

Electronic Equipment
Computer Rooms
Aircraft Cabin
Aircraft Cargo

Class K

Commercial Cooking Areas
Total Ship Protection
Heavy Goods Vehicle Shuttle Trains

Advantages of Water Mist Suppression System

As mentioned earlier, water mist suppression system uses more than 50% less water compared to a water sprinkler system. This is beneficial to companies that have multi-story buildings. If there is a fire on the top floor, the water mist suppression will turn on and suppress the fire. But in the case of a water sprinkler system, the water released can come down to the lower floors as well. This can damage your electronic or paper documents in your lower floors. So, even if the water mist suppression system is a little expensive than the water suppression system, you can reduce the damage caused when there is a fire in one of the levels of a building. Moreover, water mist suppression system is effective to extinguish the fire quickly. Lastly, these sprinkler systems are environment-friendly as they prevent releasing of harmful gas when extinguishing a fire.

To know more about water mist suppressions systems and to determine if they are right for your equipment, get in touch with Rotaflow controls.

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