Gas lines are typically buried underground at depths that vary depending on local regulations, the type of gas line, and its purpose. In the United States, the common burial depth for gas lines is generally between 18 and 24 inches (1.5 to 2 feet) below the surface.
- Service gas lines, which connect directly to homes, are usually buried around 18 inches deep.
- Main gas lines, which are larger and supply gas to neighborhoods or commercial areas, are typically buried deeper, often at least 24 inches or more.
- In some states, such as California, the minimum depth is 18 inches, while in New York and New Jersey, it is 24 inches.
- For high-pressure or transmission gas pipelines that transport gas over long distances, burial depths can be significantly deeper, ranging from 3 to 6 feet or more, and in some cases, pipelines carrying liquefied natural gas may be buried up to 100 feet underground.
- The material of the pipe also influences burial depth; for example, metal pipes like copper may require deeper burial to prevent corrosion, whereas modern materials like high-density polyethylene (HDPE) can sometimes be installed at shallower depths.
- In areas with freezing conditions, gas lines may need to be buried below the frost line to avoid damage from freeze-thaw cycles.
Overall, typical residential gas lines are buried between 18 and 24 inches deep, with main and commercial lines buried deeper for safety and durability
