A fire suppression system that contains water in the pipes but will not release water until detectors in the area have been activated is known as what type?

A fire suppression system that contains water in the pipes but will not release water until detectors in the area have been activated is known as what type?

• A. A pre-action system
• B. A wet system
• C. A dry system
• D. A deluge system

Answer: (A)

A pre-action system is being described. In this setup, the piping is not filled with water until a triggering event occurs, typically a detection signal or a pre-action valve release. This two-step process means water is held back to prevent accidental discharge and only enters the pipes after detectors in the area have been activated. Once the system is triggered, water flows into the piping and the sprinklers release. This differs from a wet system, where water is already in the pipes and released immediately when a sprinkler head is activated; a dry system, where pipes are filled with pressurized air and water enters only after a valve is opened by heat or a signal; and a deluge system, where all heads are connected to open piping and water is released through every head once the system is activated.

A pre-action system is being described. In this setup, the piping is not filled with water until a triggering event occurs, typically a detection signal or a pre-action valve release. This two-step process means water is held back to prevent accidental discharge and only enters the pipes after detectors in the area have been activated. Once the system is triggered, water flows into the piping and the sprinklers release. This differs from a wet system, where water is already in the pipes and released immediately when a sprinkler head is activated; a dry system, where pipes are filled with pressurized air and water enters only after a valve is opened by heat or a signal; and a deluge system, where all heads are connected to open piping and water is released through every head once the system is activated.