What is the maximum spacing of hangers for 1 1/2" or larger sch. 40 pipe?

The maximum spacing of hangers for 1 1/2" or larger Schedule 40 pipe is critical for ensuring proper support and maintaining the integrity of the piping system. The correct answer of 15 feet reflects established industry standards that consider both structural support and the weight of the water-filled pipe. Adequate spacing prevents sagging and potential damage to the pipes due to weight or thermal expansion.

In practical terms, if hangers are spaced too far apart, there is an increased risk of pipe movement or stress at the joints, which can lead to leaks or failures over time. Therefore, a maximum spacing of 15 feet is prescribed to ensure that each section of the pipe is adequately supported while also allowing for some expansion and contraction without putting undue stress on the system.

Choosing an incorrect option with a higher maximum spacing would not meet the necessary safety and regulatory guidelines established in plumbing codes, potentially compromising performance and causing maintenance issues in the long run.