Water Based Extinguishing Systems

Water Based Systems are systems that discharge water when activated in order to suppress a fire. The main categories of these systems are Wet Pipe Systems, Dry Pipe Systems, Deluge Systems, Preaction Systems and Water-Foam Systems.

Wet Pipe Systems

Wet pipe sprinkler systems are systems employing automatic sprinklers attached to a piping system containing water and connected to a water supply so that water discharges immediately from sprinklers opened by heat or fire. Wet pipe sprinkler systems are installed more often than all other types of fire sprinkler systems.

    Dry Pipe Systems

    Dry pipe systems are sprinkler systems employing automatic sprinklers that are attached to a piping system containing air or nitrogen under pressure,the release of which (as from the opening of a sprinkler) permits the water pressure to open a valve known as dry pipe valve, and the water then flows into piping system and out the opened sprinklers.

      Deluge Systems

      Deluge systems are sprinkler systems employing open sprinklers that are attached to a piping system that is connected to a water supply through a valve that is opened by the operation of a detection system installed in the same areas as the sprinklers.When this valve opens,water flows into the piping system and discharges from all sprinklers attached thereto.        

        Preaction Systems

        Preaction Systems are sprinkler systems employing automatic sprinklers attached to a piping system that contains air that might or might not be under pressure,with a supplemental detection system installed in the same areas as the sprinklers.There are two main sub-types of preaction systems: single interlock, and double interlock. The single interlock system admits water to sprinkler piping upon operation of detection devices.The double interlock system admits water to sprinkler piping upon operation of both detection devices and automatic sprinklers.

          Foam Systems

          Foam -Water Systems are divided into two main categories; Foam -Water Sprinkler Systems and Foam-Water Spray Systems. A Foam -Water Sprinkler System is a special system pipe-connected to a source of foam concentrate and to a water supply and equipped with appropriate discharge devices for extinguishing agent discharge and for distribution over the area to be protected. A Foam-Water Spray System is a special system pipe-connected to a source of foam concentrate and to a water supply and equipped with foam water spray nozzles or foam monitors for extinguishing agent discharge (foam or water sequentially in that order or in reverse order) and distribution over the area to be protected. In both systems, the piping system is connected to the water supply through a control valve that is usually actuated by operation of automatic detection equipment installed in the same areas as the sprinklers. When this valve opens, water flows into the piping system,foam concentrate is injected into the water with the use of the suitable mixing method (foam proportioners with foam pumps,bladder tanks or inline) and the resulting foam solution discharging through the discharge devices (or nozzles) generates and distributes foam. Upon exhaustion of the foam concentrate supply,water discharge will follow the foam and continue until shut off manually.

          Water Mist - Aqua Mist Systems

          Water Mist System is a highly efficient fire-fighting solution, as well as an economic one since it requires much less water than other water based systems. The main difference between Water Mist and traditional water based systems is its reduced droplet size. NFPA 750 defines Water Mist as a Water Spray with a droplet size of "less than 1000 microns at the minimum operation pressure of the discharge nozzle". When a droplet of water vaporises, it expands by some 1,600 times. Because heat absorption is a function of surface area and not volume, smaller droplets mean more surface area and therefore faster heat absorption. Water Mist has the unique ability to deliver water as a fine atomised mist. This mist is quickly converted to steam that smothers the fire and prevents further oxygen from reaching it. At the same time, the evaporation creates a significant cooling effect of combustion gases and blocks the transfer of radiant heat. In this way, Water Mist combines the fire suppression properties of both conventional water-based Deluge or sprinkler systems and gaseous fire suppression systems. Water Mist Systems are available in both low and high pressure versions.