What is the standard for gas piping materials in residential applications?

In residential applications, the standard for gas piping materials is primarily black iron or corrugated stainless steel tubing (CSST). Black iron pipe is commonly used because it is durable and resistant to high pressures, making it a suitable choice for gas distribution. CSST is also accepted due to its flexibility and ease of installation, as it can be snaked around obstacles and requires fewer fittings than traditional black iron piping.

These materials are specifically designed to safely transport gas while remaining compliant with building codes and industry standards. Other options, like PVC or copper, do not meet the necessary criteria for gas piping in residential settings. PVC and CPVC are typically reserved for non-pressurized applications, such as venting or drainage, not gas services. Copper can be used in certain scenarios, but it is not the standard material for residential gas lines due to concerns about the connection integrity and the potential for corrosion when in direct contact with certain gases. Thus, black iron and CSST are the preferred materials for ensuring safety and reliability in gas piping.