Which system type uses water-filled pipes that release water into the network upon sprinkler activation?

• A. Wet Pipe System
• B. Deluge System
• C. Dry Pipe System
• D. Deluge With Replenishment Valve

Answer: (A)

The main idea is how sprinkler piping is charged with water. A system that keeps water in the pipes at all times and releases it into the network as soon as a sprinkler head is heated is a wet pipe system. This setup means when any sprinkler head activates, water flows immediately through that head and into the area, providing a fast, straightforward response.

This matches the description because the pipes are water-filled from the start and only a single head needs to release water to deliver it to the area. In contrast, a dry pipe system has pipes filled with air or nitrogen under pressure, and water must travel through a dry pipe into the network after a controlling valve is opened, which causes a delay. A deluge system typically has all heads connected to a dry network and all heads discharge water once the system is activated, but the piping itself isn’t kept filled with water until activation. The variant with a replenishment valve describes a different arrangement and doesn’t reflect the always-water-filled piping of a wet pipe system.