What type of gas piping must be buried 12 inches below grade?

The requirement for buried gas piping being at least 12 inches below grade is primarily associated with ferrous and metallic piping. This depth helps protect the piping from potential damage due to surface activities, natural elements, or changes in environmental conditions.

Metallic piping, such as steel or iron, is particularly vulnerable to corrosion and physical impact, and burying it deeper serves as an additional layer of protection against these risks. It ensures that the piping system remains safe and functional, minimizing the chances of leaks or failures that could arise if the piping is exposed or inadequately protected.

While other types of piping have their own burial requirements, ferrous and metallic piping often has stricter regulations due to their nature and the risks involved in their exposure. For example, plastic piping and PVC piping are generally allowed to be buried at shallower depths in many jurisdictions, reflecting their resistance to external damage and corrosion. Understanding these specifications helps maintain safety standards in gas installations and align with regulatory requirements.