What is the typical diameter of piping in dry standpipe systems?

The typical diameter of piping in dry standpipe systems is four inches. This size is commonly used because it provides a balance between adequate water flow and pressure while keeping the pipe size manageable. A four-inch diameter allows for sufficient volumes of water to be delivered in emergency situations without requiring excessively large and heavy piping systems that could complicate installation and accessibility.

In the context of fire suppression, dry standpipes are particularly designed for use in buildings where water supply is not available inside the system or where the system is not routinely filled with water. The four-inch diameter is effective for ensuring that enough water can be delivered quickly to combat fires, especially in high-rise buildings where standpipe systems are essential for firefighting efforts.

Understanding this standard sizing enables firefighters and emergency responders to know what to expect when they connect hoses to a dry standpipe, ensuring they can efficiently manage operations during a fire incident.