Which one of these measurements is correct for the spacing of 4" hangers on steam piping?

The correct measurement for the spacing of 4" hangers on steam piping is based on industry standards and guidelines that ensure proper support and stability for piping systems. For 4" steam piping, the typical spacing is indeed around 17 feet. This distance helps to prevent sagging or undue stress on the pipes, reducing the risk of damage or failure over time.

Proper hanger spacing is critical for accommodating thermal expansion and contraction, especially in steam systems where temperature changes can lead to significant movement in the piping. The 17 feet measurement provides a balanced approach, giving sufficient support while allowing for necessary flexibility.

When considering different spacing options, it’s important to reference the applicable codes and standards for the specific materials and conditions of the installation. The other measurements do not align with standard practices for 4" steam piping, as they either exceed or fall short of the recommended spacing, which could lead to potential issues related to structural integrity and operational efficiency.