Which system is designed to protect piping when ambient temperatures drop below freezing?

Which system is designed to protect piping when ambient temperatures drop below freezing?

• A. Dry Pipe System
• B. Wet Pipe System
• C. Antifreeze System
• D. Preaction System

Answer: (A)

In freezing environments, the piping is protected by keeping water out of the pipes until a sprinkler is activated. A dry pipe system fills the piping with pressurized air or nitrogen, with water held back in a reservoir. When a sprinkler head is activated, water is released into the dry pipes and quickly fills them from the supply, but beforehand the pipes stay dry, preventing freezing damage. Wet pipe systems have water-filled piping and are more prone to freezing, while antifreeze or preaction systems are alternative approaches that address freezing differently but don’t provide the same straightforward protection as keeping the piping air-filled until activation.

In freezing environments, the piping is protected by keeping water out of the pipes until a sprinkler is activated. A dry pipe system fills the piping with pressurized air or nitrogen, with water held back in a reservoir. When a sprinkler head is activated, water is released into the dry pipes and quickly fills them from the supply, but beforehand the pipes stay dry, preventing freezing damage. Wet pipe systems have water-filled piping and are more prone to freezing, while antifreeze or preaction systems are alternative approaches that address freezing differently but don’t provide the same straightforward protection as keeping the piping air-filled until activation.