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Dry pipe and pre-action are types of dry fire sprinkler systems. Typically, they have an air compressor keeping the air or nitrogen inside the pipe pressurized. The pressurized air from the compressor is critical to holding back a water supply and therefore maintaining a functioning sprinkler system.
Dry Pipe Systems
Pressurized air is maintained until a sprinkler head is activated then the air pressure drops and the dry pipe valve releases water into the pipes which then flow through open sprinklers.
Dry pipe sprinklers are typically used in unheated buildings or places that run the possibility of freezing: such as freezers, parking garages, loading docks, residential attics, and warehouses.
Pre-Action
Pre-action fire sprinklers operate similarly to a dry pipe system but with one major difference, the water is held from an electronically operated pre-action valve. In order to commence sprinkler discharge, the system must detect a developing fire (independent flame, heat, or smoke detection) and secondly the sprinkler heads must release to permit water flow.
This dual action requirement makes pre-action systems commonly used in water sensitive environments such as art or archival storage spaces, libraries, and computer centers.
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