Which system discharges water through open heads when activated?

Which system discharges water through open heads when activated?

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

Answer: (C)

Deluge systems discharge water through open heads when activated because all sprinkler heads are kept open and the piping is filled with water. When the system is activated, water flows from every head simultaneously, providing rapid, full-coverage sprinkler action across the whole area. This contrasts with wet-pipe, where only the activated head releases water (the others stay closed), and dry-pipe or pre-action systems, where water is released into the pipes through a controlled sequence or only after a detection trigger, so not all heads discharge at once.

Deluge systems discharge water through open heads when activated because all sprinkler heads are kept open and the piping is filled with water. When the system is activated, water flows from every head simultaneously, providing rapid, full-coverage sprinkler action across the whole area. This contrasts with wet-pipe, where only the activated head releases water (the others stay closed), and dry-pipe or pre-action systems, where water is released into the pipes through a controlled sequence or only after a detection trigger, so not all heads discharge at once.