What describes an Automatic Dry Standpipe?

What describes an Automatic Dry Standpipe?

• A. Filled with pressurized air and upon opening of a hose a valve drops the air pressure that permits the dry pipe to activate allowing water into the system
• B. Continuously pressurized with water from a public supply
• C. Is pressurized by gravity feed
• D. Used only for fire department connections

Answer: (A)

Automatic dry standpipes keep the piping empty of water by charging the system with air. A dry-pipe valve at the top is held closed by that air pressure. When a firefighter opens a hose on the system, the air pressure drops, the dry-pipe valve releases, and water from the building’s water supply flows into the standpipe, filling it and delivering water to the outlets. This design minimizes water in the pipes when not in use and helps prevent freeze damage, unlike wet standpipes that are pressurized with water at all times. It isn’t limited to fire department connections, since standpipes serve interior occupants as well.

Automatic dry standpipes keep the piping empty of water by charging the system with air. A dry-pipe valve at the top is held closed by that air pressure. When a firefighter opens a hose on the system, the air pressure drops, the dry-pipe valve releases, and water from the building’s water supply flows into the standpipe, filling it and delivering water to the outlets. This design minimizes water in the pipes when not in use and helps prevent freeze damage, unlike wet standpipes that are pressurized with water at all times. It isn’t limited to fire department connections, since standpipes serve interior occupants as well.