Dry Pipe system

Dry pipe systems are fequently installed in areas which may be subject to freezing temperatures, such as unheated storage areas and loading docks. System operation is similar to Viking wet pipe systems, except that the system piping is charged with compressed air or nitrogen instead of water.

Operation

When the detector is activated by fire, pressure in the hydraulic or pneumatic release system escapes from the open divice, releasing pressure from the priming chamber of the deluge valve, allowing it to open. (Electric detectors may be used to initiate the opening of a solenoid valve to vent the release system.) The pressure operated relief valve ensures continued venting. Alarms are sounded when water flows to the open sprinlers of spray nozzles.