Which system prevents water from entering the piping until activated by a fire detection system?

The preaction sprinkler system is designed to hold water in the piping until a fire detection system activates it. This feature differentiates it from other types of sprinkler systems. It typically consists of two activation methods: the detection of heat or smoke activates the system, allowing water to flow into the pipes. Following this, the sprinkler heads will discharge the water if a fire occurs.

This approach provides a level of flexibility and safety since the system does not have water present in the pipes at all times, which can minimize water damage in the event of a false alarm. It is especially useful in situations where water damage could lead to significant issues, such as in museums, libraries, and data centers.

Unlike the preaction system, a deluge system has open sprinkler heads that release water immediately upon activation, often used in high-hazard areas. A standard response sprinkler system, on the other hand, is always filled with water, which means it does not require an activation signal to start discharging. The water spray fixed system also has its specific applications but does not share the activation features of a preaction system.