There are three main types of sprinkler systems, divided according to operating pressure. Common for the three is that they are permanently installed, use water to extinguish fires and are activated automatically. Generally the smaller water drops the system produces the more effective it is to fight fires and the smaller amount of water is needed.
Low pressure - conventional sprinkler systems
Conventional sprinkler systems with a working pressure lower than 10 bars. The low pressure makes the droplets big and the system needs large amounts of water.
Middle pressure systems - water mist systems
These systems use a higher working pressure; 10-40 bar and therefore the droplets produced are smaller than in a conventional system. The amount of water needed is about 40% lower than for a conventional system.
High pressure systems - water fog systems
High pressure sprinkler systems is the most effective type of sprinkler system working at high pressures around 100-150 bar. The high pressure, in combination with special sprinkler nozzles produce extremely small droplets which make the fire extinguishing more effective than for the two earlier types mentioned. The amount of water can be strongly reduced; a high pressure system uses approximately 90% less water than a conventional system.