When installed horizontally, 1 1/4 inch polypropylene pipe and tubing shall be supported at maximum intervals of _____.

When polypropylene pipe and tubing are installed horizontally, supporting them at specified intervals is crucial to ensure stability and prevent sagging or bending of the pipe, which can lead to operational issues or damage over time. According to plumbing codes and standards, 1 1/4 inch polypropylene pipes should be supported at intervals not exceeding 48 inches. This guideline helps distribute the weight of the pipe evenly and provides adequate support for the material to function effectively without compromising its integrity.

Selecting a support interval of 48 inches takes into account factors such as the flexibility of the material, potential thermal expansion or contraction, and the weight of any fluid that the pipe may be transporting. It ensures that there is enough structural support across the length of the pipe, minimizing the risk of failure or leaks that could arise from inadequate support.

Other interval options like 32 inches, 8 feet, or 10 feet would either be insufficient support or excessive spacing, which could lead to other installation challenges or code violations. By adhering to the 48-inch maximum support interval, plumbers can ensure a reliable and safe installation of polypropylene piping systems.