What is the maximum distance allowed from the end of a 1 1/2 inch or larger copper line to the last hanger?

In piping installations, particularly for copper lines of 1 ½ inches or larger, proper support through hangers is critical for ensuring the integrity and longevity of the system. The standard maximum distance allowed from the end of the line to the last hanger is established to prevent sagging or unnecessary stress on the piping, which could lead to damage or leaks over time.

The correct maximum distance of 30 inches reflects industry practices that balance support with practical installation considerations. If hangers are spaced too far apart, the weight of the copper line, especially when filled with fluid or subjected to thermal expansion, can lead to deflection and potential failure at unsupported points. Adhering to this spacing ensures that the piping maintains its intended shape and function while being adequately supported along its length.

Maintaining this standard not only complies with safety regulations but also promotes efficient operation and maintenance of the sprinkler systems.