What interval is specified for horizontal supports in ASD plastic piping?

The specified interval for horizontal supports in ASD (Allowable Stress Design) plastic piping is 4 feet. This guideline is important because it ensures that the piping system remains stable and secure, preventing sagging or potential damage due to unsupported lengths. Proper support is crucial for maintaining the integrity of plastic piping systems, as excessive distances between supports can lead to undue stress and contribute to system failure over time. This interval is consistent with industry standards and best practices for installation and maintenance of plastic piping systems, promoting longevity and reliability.