Which sprinkler system is used to prevent freezing?

Which sprinkler system is used to prevent freezing?

• A. Wet system
• B. Dry system
• C. Deluge system
• D. CO2 System

Answer: (B)

Dry sprinkler systems prevent freezing by keeping water out of the piping in unheated spaces. The piping is charged with air (or nitrogen) and water is held back at the dry-pipe valve in the pump room. When a sprinkler head opens, the valve releases water into the pipes, quickly filling the system and delivering water to the heads. Because most of the piping remains air-filled until activation, there’s little risk of the lines freezing in cold conditions. Wet systems have water-filled pipes that can freeze, and deluge systems also have water-filled piping, which can freeze as well. A CO2 system uses a gas for fire suppression and doesn’t rely on water-filled pipes, so it isn’t designed to address freezing in the same way.

Dry sprinkler systems prevent freezing by keeping water out of the piping in unheated spaces. The piping is charged with air (or nitrogen) and water is held back at the dry-pipe valve in the pump room. When a sprinkler head opens, the valve releases water into the pipes, quickly filling the system and delivering water to the heads. Because most of the piping remains air-filled until activation, there’s little risk of the lines freezing in cold conditions. Wet systems have water-filled pipes that can freeze, and deluge systems also have water-filled piping, which can freeze as well. A CO2 system uses a gas for fire suppression and doesn’t rely on water-filled pipes, so it isn’t designed to address freezing in the same way.