What type of pipe is commonly used for gas lines?

The type of pipe commonly used for gas lines is black iron pipe. Black iron pipe is preferred for gas applications due to its strength and ability to withstand high pressure. It has been specifically manufactured to handle the characteristics of natural gas and propane, providing a durable and reliable option for transporting gases safely.

Furthermore, black iron pipe allows for the secure connections needed to prevent leaks, which is critical in any gas line installation. Additionally, it is resistant to corrosion, making it suitable for both indoor and outdoor applications.

While other materials like galvanized steel, copper, and PVC are used in various plumbing applications, they do not meet the critical requirements for gas service as effectively as black iron pipe does. For example, galvanized steel is more suited for water lines, and PVC is typically not acceptable for gas lines due to its inability to withstand the high temperatures and pressures associated with gas transport. Copper, while also a durable material, is generally used for water lines and can be more expensive and less effective in gas applications.