Where must plastic pipe, tubing, and fittings for gas supply be used?

Plastic pipe, tubing, and fittings for gas supply are specifically designed for underground use outdoors due to their resistance to corrosion and other environmental factors. In these conditions, they can effectively handle the pressures and stresses associated with gas transportation while minimizing the risk of leaks or breakage from external forces.

Using plastic in underground applications helps prevent issues related to moisture absorption and UV degradation that can occur when plastic is exposed to the elements over time, which would not be safe for gas supply. The correct application of these materials aligns with safety standards and regulations that ensure the integrity of gas distribution systems. Thus, when installed properly underground, plastic materials can reliably transport gas without posing a hazard.