What is the most commonly used material for gas piping in fuel gas systems?

The most commonly used material for gas piping in fuel gas systems is steel or flexible corrugated stainless steel tubing (CSST). This designation encompasses both traditional carbon steel pipes, which are widely seen in underground and above-ground installations, and the more modern CSST, known for its flexibility and ease of installation in various applications.

Steel is robust and offers durability, making it suitable for a range of environmental conditions and pressures associated with fuel gas applications. CSST, on the other hand, provides significant advantages, including reduced installation time due to its lightweight, flexible characteristics, and the ability to navigate around obstacles, which can simplify the overall gas system installation.

Ultimately, the extensive usage of steel and CSST in residential, commercial, and industrial applications reflects their proven performance, safety, and compliance with applicable building codes and standards. In contrast, the other options such as copper tubing and PVC pipe are less commonly used for gas piping. Copper can be utilized in some specific applications but is often limited due to cost and vulnerability to corrosion. PVC, while used for other types of plumbing, is not rated for gas transport, and aluminum doesn't possess the same safety and regulatory approvals required for gas systems.