Which sprinkler system is typically used in buildings where piping may be subjected to freezing temperatures?

Which sprinkler system is typically used in buildings where piping may be subjected to freezing temperatures?

• A. Dry-Pipe
• B. Wet-Pipe
• C. Deluge
• D. Heated

Answer: (A)

When piping might freeze, the goal is to avoid having water sits in the pipes until activation. A dry-pipe system does exactly that: most of the piping is filled with air, and water is held back in a separate storage area behind a dry-pipe valve. When a sprinkler head is heated, the valve opens and water rapidly fills the dry pipes, releasing to the activated head. This arrangement minimizes the chance of freezing damage because the pipes aren’t filled with water in ordinary conditions. Wet-pipe and deluge systems, by contrast, have water in the pipes at all times, making them vulnerable to freezing in cold environments. “Heated” isn’t a standard sprinkler-system type and doesn’t address the freezing issue the way dry-pipe does.

When piping might freeze, the goal is to avoid having water sits in the pipes until activation. A dry-pipe system does exactly that: most of the piping is filled with air, and water is held back in a separate storage area behind a dry-pipe valve. When a sprinkler head is heated, the valve opens and water rapidly fills the dry pipes, releasing to the activated head. This arrangement minimizes the chance of freezing damage because the pipes aren’t filled with water in ordinary conditions. Wet-pipe and deluge systems, by contrast, have water in the pipes at all times, making them vulnerable to freezing in cold environments. “Heated” isn’t a standard sprinkler-system type and doesn’t address the freezing issue the way dry-pipe does.