Dry - Pre-Action System copy

Dry System

A dry-pipe system utilizes water as an extinguishing agent. Pipes run from the dry pipe valve, a remote valve located in a heated space, to the automatic fusible sprinklers. The pipes are filled with pressurized air or nitrogen. Dry pipe systems are used in cold areas where the water would freeze, partially or entirely, if kept in the pipes. The air in the pipes keeps the dry pipe valve in the closed position. The dry-pipe valve prevents water from entering the pipes until a fire causes one or more of the sprinklers to operate. Once this happens, the air escapes and the dry pipe valve opens. Water then enters the pipe, flowing through the open sprinklers and onto the fire.


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