What is the minimum size for hanger rods used with pipe diameters of 10 to 12 inches?

The minimum size for hanger rods used with pipe diameters of 10 to 12 inches is 5/8 inch. This specification is based on guidelines for proper support and stability for larger diameter piping systems. Hanger rods must be able to adequately support the weight of the pipe, potential fluid loads, and any additional forces that may occur due to thermal expansion or contraction.

Using 5/8 inch rods ensures not only strength but also compliance with building codes and standards, such as those outlined by the National Fire Protection Association (NFPA) and the American Society of Mechanical Engineers (ASME). These standards help maintain safety and performance in sprinkler systems, preventing any failures that could lead to catastrophic events.

Hanger rods that are too small may not provide sufficient strength and could lead to sagging or failure under load. Therefore, the choice of a 5/8 inch hanger rod is crucial in maintaining the integrity and functionality of fire protection systems in buildings.