Dry Sprinkler System
In a dry-pipe system, sprinklers are attached to pipes that contain pressurized air. When heat activates the sprinklers to open, the air pressure is reduced, allowing the dry pipe valve to open and water to flow from the sprinkler.
Dry-pipe systems are usually used only when temperatures are not high enough to prevent freezing (Below 40 deg. F).
Since they have a slower response time, they should be converted to wet-pipe systems as soon as sufficient heat becomes available.
In situations where only a few sections lack heat, it is recommended to use a combination of dry and wet-pipe systems.
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