The use of pressurized air or nitrogen in the piping system allows for the easy detection of leaks.įire services use the hydrant for a continuous flow of water which is vital to firefighting operations. The two-event discharge requirement adds an elevated level of protection from such inadvertent discharges. Accidental activation often results in costly, irreversible property and water damage. It’s not uncommon for sprinkler heads to be falsely triggered. Pre-action systems offer several advantages. Now that water is on deck, one or more individual sprinkler heads need to release to engage and discharge water. Upon alert, the pre-action valve releases, water flows in, and the system essentially becomes a wet pipe system.Ģ. The pre-action valve will only activate when an independent fire detection system detects a fire. This system requires two events to happen before any sprinklers discharge:ġ. Pre-action pipes start out as dry pipes they hold water back using an electronic “pre-action" valve. Pre-action fire sprinklers fall right in between all of these. Fire suppression systems fall into three fundamental categories: wet pipe, dry pipe, and deluge.
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