Water Mist System Calculator

Calculate water mist fire suppression requirements per NFPA 750. Water mist uses fine droplets for efficient fire suppression with minimal water damage.

Typical: 10-30 minutes depending on hazard

Water Mist System Classifications

Pressure Class Operating Pressure Droplet Size
Low Pressure< 175 psi (1.2 MPa)Larger droplets
Intermediate175-500 psiMedium droplets
High Pressure> 500 psi (3.4 MPa)< 200 micron

Water Mist Suppression Mechanisms

Cooling

Fine droplets absorb heat efficiently through rapid evaporation, cooling both flames and surrounding surfaces.

Oxygen Displacement

Steam from evaporation displaces oxygen in the combustion zone, reducing fire intensity.

Radiant Heat Blocking

Mist cloud blocks radiant heat transfer, preventing fire spread to adjacent combustibles.