What type of tubing is commonly used for natural gas installations?

The choice of black iron pipe or flexible gas line (CSST) as the correct answer for natural gas installations is rooted in safety and code compliance. Black iron pipe has been a traditional choice in the plumbing and gas industries for many years due to its strength, durability, and ability to handle high pressure, which is crucial for natural gas. It provides a secure and leak-resistant connection for gas supply lines.

On the other hand, flexible gas lines, such as Corrugated Stainless Steel Tubing (CSST), offer versatility and ease of installation, allowing for easier bends and connections in tight spaces. CSST is lightweight, resistant to rust, and has been engineered to provide a safe option for gas delivery, making it increasingly popular in modern installations.

Both black iron pipe and CSST meet the necessary codes and standards for gas installations, ensuring safety and reliability, which is a primary concern when dealing with combustible materials like natural gas. In contrast, PVC pipe is not suitable for gas installations due to its inability to withstand high pressures and potential for degradation when exposed to the elements. Copper pipe can be used in some cases, particularly in LPG applications, but is not the standard for natural gas. Galvanized steel pipe is also not commonly used for gas installations