HI-FOG® is very flexible, allowing for a wide range of configurations. Each configuration may contain one or more of the following types of systems.
Wet pipe systems are typically used in accommodation and similar areas where solid materials are the combustible media. When ambient temperature exceeds a given limit, the activation bulb of the sprinkler bursts and water mist is discharged from that particular sprinkler.
A deluge system normally has open spray heads with water flow controlled by closed valves. When a valve is opened, water mist is discharged by all spray heads in the section controlled by that valve. Deluge systems are typically used in spaces where fuel fires could occur.
Dry pipe systems operate similarly to wet pipe systems, but the water is kept on the pump side by a closed valve. Tubes are instead filled with compressed air and monitored: a pressure drop indicates a broken sprinkler bulb. Water is then released and discharged by the activated sprinkler(s). Dry pipe systems are typically used in spaces subject to freezing.
This system type is essentially the same as a dry pipe system, except that it is connected to a fire detection system. A discharge requires both a sprinkler bulb to burst and an alarm to be raised by the independent fire detection system. Pre-action systems are used to protect areas where the risk of false discharge or leakage must be kept to an absolute minimum.