Have you ever wondered about the benefits of water mist systems? Or maybe the difference between a water mist system and a traditional fire sprinkler system?
In this article, we will talk through the popular firefighting agents, their suitability, advantages, disadvantages and system designs.
What is a water mist system?
A water mist system is a fire protection system that produces a fine spray to suppress fires – a common alternative to traditional large-droplet fire sprinklers. Water is the oldest, most widely used and universally available firefighting agent known to man. It is non-toxic, environmentally friendly and has superior fire protection capabilities when compared with other agents.
How do water mist fire suppression systems work?
The iMist suppression system and traditional fire sprinkler systems work in the same way when it comes to activation: both wet the surface of the fuel and the surrounding area to cool and suppress the fire like a blanket of water. However, only the water mist system works in all three of the following ways simultaneously, using minimal water to extinguish a fire:
- Cooling by mist: Upon activation of a water mist nozzle, the system discharges high-pressure water mist. The mist fills the 16m² area (per nozzle) with a fine spray, which travels around the room, dampens surfaces and restricts fire spread.
- Temperature reduction: Because the water is discharged at high pressure, room temperature drops sharply as the fast-moving, cool water molecules react with the heat from the fire – much like cold air displacing hot air.
- Oxygen displacement: As the mist makes direct contact with the flame, it turns to steam. The steam then displaces oxygen around the fire, suffocating it.
Unlike in Hollywood films, only the nozzles located in the area of the fire will release mist.
What is the suitability for fire suppression systems?
When choosing between fire suppression systems, consider these factors:
- Activation speed: water mist systems activate quickly to reduce smoke buildup, giving occupants more time to evacuate safely.
- Water supply: iMist systems require minimal water flow (less than a power shower), eliminating the need for bulky water tanks in homes or housing developments.
- System flexibility: flexible hydraulic hoses mean iMist systems can be retrofitted into existing properties with ease.
System designs of water mist systems and fire sprinklers
Nozzles
Both water mist and sprinkler systems use fixed nozzle heads, accurately and efficiently positioned within the property to ensure full protection. iMist water mist nozzles are discreetly designed to blend in with ceiling fittings and can be produced in any RAL colour to suit your needs.
Pumps
Water mist systems use less water than sprinkler systems, which means less post-fire damage to the property. In properties with low water flow, a mist system may be more appropriate, because traditional sprinkler systems need large water tanks installed inside the property to ensure adequate flow. iMist systems negate the need for a large tank and instead use small pumps that fit conveniently in tight spaces, such as under a sink or staircase.
Pipework
Both water mist and sprinkler systems use fixed pipework. iMist uses custom hydraulic hoses, which make it possible to retrofit fire suppression systems into properties thanks to the flexibility of the hose.
Check out iMist’s system design here
Accreditations and certification of firefighting agents
Both water mist fire suppression systems and fire sprinkler systems can gain a range of accreditations and certifications to demonstrate the reliability and effectiveness of their system, components and materials. Published British Standards, for example, set specific criteria that water mist suppression systems and components can be measured against.
The main difference between the two firefighting agents is longevity: conventional fire sprinkler systems have been in use for over 100 years, whereas mist systems have only been developed over the last few decades – though they now have extensive data, knowledge and testing behind them.
Another difference between water mist systems and fire sprinklers is the category each standard defines itself under.
See below an example of the British Standard that states when Automatic Water Fire Suppression Systems (AWFSS) must be installed.
Water mist fire suppression systems – BS 8458:2015
Fire sprinkler systems – BS 9251:2021
Why choose iMist for my fire suppression system?
We have been designing, manufacturing and installing iMist water mist fire suppression systems for clients across the UK since 2015. We have worked hard to obtain and pass numerous third-party accreditations and are now one of the most comprehensively tested and well-known water mist fire suppression systems.
Some reasons to choose us for your water mist fire suppression system:
- 109 years of combined industry experience
- Highly responsive service, including free 24-hour turnaround designs and free site visits
- Third-party accredited for quality assurance
- Cost transparency with no hidden fees
- Free home quotation services, UK-wide
FAQs
Do water mist systems still work if air conditioning is on, or doors and windows are open?
Yes, depending on the nozzle layout and ventilation conditions. Water mist systems are successfully tested for tunnel and outdoor fires, and in test cells with windows and doors open. Once you’ve chosen a company, they’ll be able to advise on the correct placement of your nozzles and system.
Can firefighting agents be connected to fire panels?
Some companies, including iMist, can connect their systems to third-party equipment such as fire panels, fire alarm systems, AOVs (Automatic Opening Vents), SMS units, fire curtains and more.
Check out the rest of our FAQs.
