Water Mist System Working Principle

Functioning Principles of a Water Mist Fire Protection System

These little water beads (fog) quickly absorb the energy (heat) existing in the environment and vaporize, ending up being water vapor (gas). The energy (warmth) made use of to change the water to a gas is eliminated from the setting, hence the air is cooled down.

Mist Water Cooling works by forcibly pushing water via our specifically developed misting nozzles; this produces a mist (haze) of ultra fine water droplets with a typical size of 25 microns or less. With high pressure mist cooling you will obtain an even smaller droplet dimension, just 5 microns.

If we were to take marine vessels as an instance, engine room fires represent a hazard for team members functioning onboard ships & ferry’s as well as heavy monetary loss for the ship owners or operators. Examinations expose that aroiund 56% of all engine room fires were triggered by the combination of oil leak onto a warm surface area. Elimination of warm surfaces and also appropriate installation of couplings and tubes in fuel oil system has actually reduced the danger of fire substantially. In case of an engine room fire, a local water mist fire protection or extinguishing system can be utilized to prevent the acceleration of fire as well as keep the temperature levels reduced.

Key Equipment Conponents

System Components
1. Key Control board
2. Water Pump (For High Pressure Application).
3. Fire Detectors (Detects Fire in Specific Area).
4. Solenoid Valve (One For every Specified Location.
5. Water Nozzles (Creates Water Mist).

How does A Water Mist System operate?

The water mist fire fighting system includes 2 detectors positioned over the area to be secured (such as primary engine, auxiliary engines, burner, auxiliary central heating boiler, purifiers, and so on). Of these 2 detectors, one is a smoke as well as the other is a fire detector.

In the event just one detector is turned on in a protected area, it offers an emergency alarm as a pre caution. In instances where both the detectors are triggered, the details are transmitted to the main control board of the water mist fire control system and it then begins the water pump, and opens the solenoid shutoff to the protected area. Water at high pressure (around 10 bar at the nozzle) is pumped through specially design pipework to each water mist nozzles and creates a fine mist which is enveloped over the protected area. Water mist is released until all signs of smoke or fire has been eliminated.

Incase of instances where an automatic system start-up does not function or the detection systems has not yet triggered, a Manual Procedure is generally operated through the Manual Start button on the local or push-button control panel for the specific location, which will immediately start the pump and also trigger the solenoid valve for that specific area.

Particular Area on Marine Vessels that utilise water mist systems will include:.

– Burner space.
– Auxillary boiler systems.
– Purifier areas.
– Auxiliary generators.
– Inert gas generator spaces.
– Main engine cylinder head spaces
– Steering equipment rooms.
Source: http://marineengineeringonline.com/

The image below depicts exactly how the Water Mist System Concept Functions;


water mist system working principles


For reliable operation of any kind of Water Mist Fire Security Equipments, the adhering to guidelines ought to be kept:.

– Power supply needs to be available.
– The location around the active water mist water pump must be clear of any kind of obstructions.
– Enough water level must be retained in the marked fresh water tanks.
– Drainpipes and maintenance shutoffs have to be closed as well as well labelled.
– The emergency alarm system needs to be in operation.
– A clear operation process for manual and auto operations should be documented and be displayed.
Source http://marinestudy.net/

LPG Fire Australia has designed, developed and also supplied water mist fire protection systems, both low and also high pressure into Australia for Atriums, Information Centres, Heritage Structures, Diesel Generators, Oil Transformers, FPSO, and also Vessels.

Our High Pressure AQUAFOG as well as Low Pressure VID Fire-Kill allows us to supply a system suitable for your application.

To find out more, see our Water Mist Product page http://lpgfire.com.au/products/high-pressure-watermist