Which system uses open-type sprinkler heads and releases water through all heads when activated?

Which system uses open-type sprinkler heads and releases water through all heads when activated?

• A. Dry-pipe
• B. Deluge
• C. Wet-pipe
• D. Pre-action

Answer: (B)

Deluge systems use open-type sprinkler heads, meaning every head in the system is connected directly to the water supply and remains open. When the system is activated, water is released through all heads at once, providing immediate, widespread coverage. This is different from other types where water is distributed only through the heads that are activated or require a prior action or event before water enters the piping. Dry-pipe pipes are filled with air and only release water into the pipes after a valve is triggered, wet-pipe systems send water to the activated head, and pre-action systems require a detection event before water enters the system. So the feature of open heads with simultaneous discharge matches a deluge system.

Deluge systems use open-type sprinkler heads, meaning every head in the system is connected directly to the water supply and remains open. When the system is activated, water is released through all heads at once, providing immediate, widespread coverage. This is different from other types where water is distributed only through the heads that are activated or require a prior action or event before water enters the piping. Dry-pipe pipes are filled with air and only release water into the pipes after a valve is triggered, wet-pipe systems send water to the activated head, and pre-action systems require a detection event before water enters the system. So the feature of open heads with simultaneous discharge matches a deluge system.