With which kind of sprinkler system will accelerators and exhausters be found?

• A. Wet-pipe
• B. Deluge
• C. Deluge and Wet
• D. Dry-pipe

Answer: (D)

Accelerators and exhausters are features used to speed up and manage air displacement in a dry-pipe sprinkler system. In a dry-pipe setup, most of the piping is charged with pressurized air or nitrogen, and water is held back by a dry-pipe valve. When a sprinkler head is activated, the valve opens and water begins to fill the dry pipes. The accelerator helps push water into the piping quickly, reducing the delay before water reaches the heads. The exhaustor vents the air being displaced as water fills the lines, preventing air pockets and ensuring faster, smoother water delivery. Wet-pipe systems have water-filled pipes from the start, and deluge systems have open, water-filled piping, so neither uses these air-management devices. Therefore, accelerators and exhausters are associated with the dry-pipe system.