What is the minimum depth of burial for piping and tubing in residential installations?

The minimum depth of burial for piping and tubing in residential installations is essential for ensuring safety and protection against physical damage, as well as exposure to frost and other environmental factors. The correct answer is 15 inches because this depth allows for sufficient coverage to protect against various potential hazards.

By burying gas piping at this specified depth, the installation is less likely to be disturbed by surface traffic or landscaping activities, reducing the risk of accidental damage. Additionally, this depth helps to minimize the effects of frost heave, which can occur in colder climates, thereby ensuring the integrity of the gas system year-round.

Regulations regarding the burial depth are designed to prioritize the safety of the installation, ensuring that it complies with national and local codes. Hence, the specified depth is crucial for both compliance and safety in residential gas installations.