Knox  Fire & Security Ltd

Kings Head House

15 London End

Beaconsfield

HP9 2HN

UK

02082 421704

©2017 BY KNOX FIRE & SECURITY LTD.

SP203 - Part 1 

Fire Alarms

SP203 - Part 3 

Fixed Suppression

HIGH PRESSURE WATER MIST FOR PROTECTION OF MACHINERY SPACES

WATER MIST

Water mist systems optimise the quantity of water used through the distribution of very small droplets to achieve maximum cooling effect. The system operates at working pressures of 80 to 200 bars to produce droplets of very small diameter at very high speed.

The fire extinguishing system uses water at high pressure as an agent and are based on principles of well established hydraulic technology. The spray heads are designed to discharge water in the form of water mist. The tiny drops create a large effective cooling surface area of the fire and surrounding volume. The high speed of the droplets means that the mist can penetrate the hot fumes and reach the combustion area.

Water spray in droplets of less than 200 microns produces a large surface area for heat absorption. Once in contact with hot bodies and gases, these droplets turn to vapour absorbing a large quantity of heat.

The water in its vapour state occupies 1,600 times more volume than as a liquid and displaces an equivalent volume of oxygen, thus creating a smothering effect. If both the water vapour generated and the temperature in the hazard is high enough, the concentration of oxygen can fall drastically in the whole room.

The mist cloud generated in the enclosure absorbs a large part of the radiated heat thus protecting the adjoining risks.