ASP Fire CEO Michael van Niekerk discusses how water mist fire protection systems offer robust protection with minimal operational impacts.
When it comes to protecting critical assets in demanding environments, traditional sprinklers and gaseous systems are not always the best fit. Water mist fire suppression has emerged as a highly effective alternative that minimises water damage, supports life safety and offers strong environmental performance, particularly in specialised and high-risk applications.
What is water mist fire suppression
Water mist systems are water-based fire suppression systems that discharge very fine water droplets through specially engineered nozzles at low, intermediate or high pressures. According to NFPA 750, the standard on water mist fire protection systems, water mist is defined as a spray in which 99% of the water volume is in droplets smaller than 1 000 microns in diameter at the minimum operating pressure.
By comparison, conventional sprinkler droplets are significantly larger. The much smaller droplet size dramatically increases the total surface area of water exposed to heat. As the droplets absorb heat and rapidly evaporate to steam, the system cools the flames and hot gases, displaces oxygen immediately around the fire and reduces radiant heat transfer.
The result is fast fire control or extinguishment, with a fraction of the water flow of traditional sprinkler systems, which in turn reduces collateral water damage, clean-up time, and business interruption.
“From an engineering perspective, water mist allows us to design tightly focused suppression solutions,” explains ASP Fire CEO Michael van Niekerk. “You get the cooling and oxygen displacement benefits of water, but with far lower volumes and a more controlled impact on equipment, structures and contents.”
Advantages of water mist systems
- Reduced water consumption: Operates at lower flow rates, minimising water damage and infrastructure demands.
- Enhanced life safety: Improves visibility, reduces smoke, and extends safe egress time.
- Environmental performance: Uses water as the extinguishing medium, avoiding ozone depletion and global warming impacts.
- Resilience in ventilated spaces: Effective in areas where gaseous systems may fail due to ventilation.
Where water mist is most effective
- Machinery spaces: Ideal for ships, turbine enclosures, and generator rooms.
- Data centres and IT facilities: Prevents fire spread and limits equipment damage.
- Heritage buildings and museums: Protects irreplaceable collections with minimal water usage.
- High-end hospitality and industrial kitchens: Ensures occupant safety and rapid return to service.
- Limitations and proper application
- Water mist is not suitable for all scenarios. Large, open spaces or rapid-growth fires may require alternative systems. Proper application involves detailed risk assessments, hydraulic calculations, and adherence to standards like NFPA 750.
- Emerging applications
- Recent innovations include managing lithium-ion battery fires and integrating water mist with intelligent detection systems. These advancements make water mist a strategic tool for modern fire risk management.
