Which sprinkler system is characterized by pipes that are filled with water and discharge immediately through activated heads?

Which sprinkler system is characterized by pipes that are filled with water and discharge immediately through activated heads?

• A. Wet Pipe System
• B. Dry Pipe System
• C. Deluge System
• D. Pre-Action System

Answer: (A)

Wet pipe sprinkler systems keep water in the sprinkler piping at all times, so when a sprinkler head is heated and activates, water is discharged immediately through that head into the protected area. This immediate response is the defining feature: the piping is already full of water, and only the activated head releases it. Because the water is ready to go, these systems react fastest and with relatively simple equipment. In other types, like dry pipe, the pipes are filled with air or nitrogen and water must be released into the lines before discharge occurs, causing a delay; deluge systems have water in the pipes and release water from all heads when activated; and pre-action systems require a trigger before water enters the pipes. The described characteristic points to the wet pipe system.

Wet pipe sprinkler systems keep water in the sprinkler piping at all times, so when a sprinkler head is heated and activates, water is discharged immediately through that head into the protected area. This immediate response is the defining feature: the piping is already full of water, and only the activated head releases it. Because the water is ready to go, these systems react fastest and with relatively simple equipment. In other types, like dry pipe, the pipes are filled with air or nitrogen and water must be released into the lines before discharge occurs, causing a delay; deluge systems have water in the pipes and release water from all heads when activated; and pre-action systems require a trigger before water enters the pipes. The described characteristic points to the wet pipe system.