What is necessary for piping that enters a building from underground?

For piping that enters a building from underground, encasing it in protective conduit is critical to ensure both safety and durability. This requirement is established to prevent damage to the gas line from external forces, such as movement of soil or equipment, as well as to protect against the ingress of water or moisture that could lead to corrosion or other forms of deterioration. The protective conduit acts as a barrier, safeguarding the integrity of the gas piping and minimizing the risk of leaks, which could have serious safety implications.

The requirement for protective conduit also aligns with national safety standards, which dictate that any piping system must be designed and installed with protective measures to ensure long-term reliability and safety. This concept is integral in gas line installations, especially when entering a building from an underground source, as it mitigates various environmental risks associated with underground installations.