If gas piping is installed in an area where condensation could form, how should it be sloped?

In gas piping installations, it's critical to consider the potential for condensation, especially in areas where the temperature might lead to moisture accumulation. When gas piping is subjected to varying temperatures, particularly when it runs through cooler spaces, condensation can form on the interior surfaces. To prevent this moisture from accumulating and causing potential blockages or corrosion, proper sloping of the gas pipes is necessary.

The correct answer emphasizes a slope of 1/4" in 15 feet. This slope is specific to ensuring that any condensation that may occur within the piping system will drain away rather than pool or accumulate in low areas, which could inhibit gas flow or create hazardous conditions. The slope allows any condensation to effectively travel down the pipeline towards a safe drainage point or outlet designed for that purpose.

This particular slope ratio provides an effective drainage without putting undue stress on the piping system or making installation unmanageable. It strikes a balance between effectiveness in promoting drainage and practicality in installation practices. In contrast, other slope ratios may not achieve the same level of effectiveness in promoting suitable drainage for condensation issues across the lengths of piping typically used.