Which of the following is NOT one of the six sprinkler system types listed?

Which of the following is NOT one of the six sprinkler system types listed?

• A. Air-pressurized
• B. Wet pipe
• C. Deluge
• D. Preaction

Answer: (A)

Sprinkler system types are categorized by how water is stored and released in the piping. Wet pipe systems have water-filled pipes that deliver water to a sprinkler head immediately when it’s opened. Deluge systems keep all heads open so water is released to all heads once the system is activated. Pre-action systems require a triggering event beyond a sprinkler head to release water into the piping, adding a safeguard against accidental discharge. Air-pressurized, while it can be used within dry-pipe arrangements to maintain pressure, isn’t itself listed as a separate sprinkler system type in the common classifications. So it isn’t counted as one of the standard types, making it the option that isn’t among the six listed.

Sprinkler system types are categorized by how water is stored and released in the piping. Wet pipe systems have water-filled pipes that deliver water to a sprinkler head immediately when it’s opened. Deluge systems keep all heads open so water is released to all heads once the system is activated. Pre-action systems require a triggering event beyond a sprinkler head to release water into the piping, adding a safeguard against accidental discharge. Air-pressurized, while it can be used within dry-pipe arrangements to maintain pressure, isn’t itself listed as a separate sprinkler system type in the common classifications. So it isn’t counted as one of the standard types, making it the option that isn’t among the six listed.