Which sprinkler system is ordinarily equipped with open type sprinkler heads?

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

Answer: (A)

Open-type sprinkler heads are used in a deluge system because the goal is rapid, full-area flooding: all heads are open, so when the system is activated, water flows out of every head at once. The piping is typically not water-filled until activation, and a deluge valve releases water into the network to flood the protected space immediately. In contrast, wet-pipe systems keep water in the pipes and use heads with heat-sensitive elements that release water only at the heated heads, while dry-pipe systems keep the pipes pressurized with air and fill with water after activation, delivering water to whatever heads are triggered. A delayed system does not reflect the standard open-head approach.