What is the minimum backfill cover for buried piping?

The minimum backfill cover for buried piping is 18 inches. This requirement is established to ensure adequate protection for the piping from external loads, environmental factors, and potential damage from other activities. An 18-inch coverage helps to mitigate the risk of mechanical damage, as it provides a sufficient layer to absorb and distribute impacts that may occur from surface activities, such as vehicle traffic or construction work.

This depth also assists in preventing freezing of fluids within the pipes in colder climates, supporting proper functionality and longevity of the system. Thus, ensuring at least 18 inches of backfill cover is a critical practice in installing buried piping in medical gas systems and other applications, promoting safety and reliability.