Which sprinkler system type uses open sprinklers that discharge water simultaneously when water enters the system?

• A. Wet Pipe System
• B. Dry Pipe System
• C. Deluge System
• D. Hybrid System

Answer: (C)

Deluge systems have every sprinkler head open, and the piping is designed so water can reach all heads. When the system is activated, water enters the network and flows out of every head at once, since there are no heat-triggered closures on individual heads. This makes the deluge design ideal for areas where rapid, total flooding is needed across a broad hazard zone. The water supply is controlled by a deluge valve or other control means, which opens to release water to the entire pipe network simultaneously. In contrast, other system types keep most sprinklers closed until a specific head is heated or a valve is opened, so water is typically discharged only where the system design dictates.