What are water mist fire extinguishers used for?

What are water mist fire extinguishers used for?

Water mist fire extinguishers use a very fine de-ionised water spray which not only puts out Class A fires like a standard Water fire extinguisher, but can also be used on liquid, electrical and oil fires (a Class A fire is a fire which involves ‘combustible materials’, such as paper, wood or textiles).

How does water mist work?

A water mist system is a fire protection system which uses very fine water sprays (i.e. water mist). The small water droplets allow the water mist to control, suppress or extinguish fires by: cooling both the flame and surrounding gases by evaporation. displacing oxygen by evaporation.

When should you use a water mist?

For Class B fires, you can use water mist systems when you have pool, spray, or vertical surface fires of flammable and combustible liquids, and it can work when you have fires in different combination modes.

What is a misting system?

Misting systems are most commonly defined as a series of specially mist nozzles placed in a line around the perimeter of an area. Misting systems will produce billions of tiny droplets every second. If these droplets are introduced into an outdoor area, they quickly evaporate.

How do you use a water mist extinguisher?

How To Use A Water Mist Fire Extinguisher

1. With the water extinguisher on the ground a safe distance from the fire, remove the safety pin and break the tamper seal.
2. Aim the hose at the base of the fire with one hand.
3. Holding the lever in your other hand, you then start to slowly squeeze it to discharge the water.

What is mist system?

Misting systems are most commonly defined as a series of specially mist nozzles placed in a line around the perimeter of an area. When misting systems are placed inside an enclosed area (such as a greenhouse), the billions of droplets that are produced will initially provide cooling as the droplets evaporate.

What is mist water?

Mist is tiny droplets of water hanging in the air. These droplets form when warmer water in the air is rapidly cooled, causing it to change from invisible gas to tiny visible water droplets. Mist often forms when warmer air over water suddenly encounters the cooler surface of land.

What is a water mister?

Water misters provide a cooling, fine mist that helps people, pets and plants feel cooler in hot weather. Misters range from the very basic personal mister that attaches to a garden hose to complete misting systems typically used in commercial applications.

Why is water spray more effective than a straight stream of water for fire suppression?

Many thousands of separate droplets injected into the hot fire gases will absorb more energy, more quickly than a straight stream that penetrates straight through with only the water on the outside of the stream exposed. These two factors mean small water droplets heat up faster.

What is the pressure of a water mist system?

Medium pressure water mist system is a system in which the system pressure is between 12.5 and 35 bar. Object protection system (also known as local application system) is a water mist system designed to discharge water mist directly onto an object or hazard.

When was the first use of water mist?

A form of water mist system was originally used in the 1930s in industrial applications for asset protection. In the last decade, water mist came to prominence for fire protection use on board ships and for industrial and commercial applications.

Is it necessary to have a water mist system in a house?

Water mist systems are part of the overall package of fire safety measures in a residential building and should not be considered in isolation. For example, there would generally be smoke alarms or a fire detection and alarm system installed and passive fire protection measures in place.

Which is better a water mist system or sprinkler system?

© Building Research Establishment 2006 34 Some of the advantages that water mist systems have compared to sprinkler systems are: they use less water; they are perceived to be cheaper where system weight is an issue; they produce less water damage; they do not always require a water mains connection.