The arrangement of deluge fire sprinkler system piping is similar to a wet or dry pipe system with two major differences:
A. Standard sprinklers are used, but they are all open. The activating elements have been removed so that when the control valve is opened water will flow from all of the sprinklers simultaneously and deluge the area with water.
B. The deluge valve is normally closed. The valve is opened by the activation of a separate fire detection system.
Deluge systems are used where large quantities of water are needed quickly to control a fast-developing fire. Deluge valves can be electrically, pneumatically or hydraulically operated.
Pre-action sprinkler system :
A pre-action sprinkler system is similar to a deluge sprinkler system except the sprinklers are closed. This type system is typically used in areas containing high value equipment or contents and spaces which are highly sensitive to the effects of accidental sprinkler water discharge. The pre-action valve is normally closed and is operated by a separate detection system.
Activation of a fire detector will open the pre-action valve, allowing water to enter the system piping. Water will not flow from the sprinklers until heat activates the operating element in individual sprinklers. Opening of the pre-action valve effectively converts the system to a wet pipe sprinkler system.
In a pre-action system the piping is pressurized with air or nitrogen, monitoring of this air pressure provides a means of supervising the system piping. Loss of the supervisory air pressure in the system piping results in a trouble signal at the alarm panel.
Ductile Iron material to ASTM - A536 :
Flanged x Flanged, Grooved x Grooved and Grooved x Flanged available Rated for maximum 17.2Bar (250 PSI) operating pressure Size: 1-½”(DN40),2”(DN50),3”(DN80), 4”(DN100), 6”(DN150)&8”(DN200) Available sizes:11⁄2" (DN40), 2" (DN50), 3" (DN80), 4" (DN100), 6" (DN150), and 8" (DN200)
● Vertical or horizontal installation
● One internal working part
● No linkage or clapper assembly
● Light weight ductile iron body
● Available with deluge and single & double interlock preaction trim
● Internally & externally coated
● Features external resetting
● Diaphragm operation
● For most seawater & brackish water supplies
● For deluge, preaction & foam systems