What material is not allowed on the house line and is considered an AOC?

The material that is not allowed on the house line and is considered an AOC (Approved for Operational Change) is plastic piping. Plastic piping, particularly polyvinyl chloride (PVC) and other similar materials, poses a significant risk when used for gas distribution. These materials can be subject to warping, melting, or degradation under certain conditions, such as exposure to ultraviolet light or temperature fluctuations.

In many jurisdictions, the use of plastic piping for gas lines is prohibited because it does not provide the necessary safety and durability required for gas distribution systems. Gas piping must be constructed from materials that can withstand high pressures and potential impacts, as well as resist corrosion and other environmental factors. Other materials like copper, polyethylene, and steel are typically approved for use in gas piping systems, as they meet strict safety standards and are able to endure the demands of gas distribution.

Understanding why certain materials are not allowed helps ensure that gas systems are designed, installed, and maintained safely, minimizing risks associated with leaks or system failures.