What is the common material used for gas supply lines?

The common material used for gas supply lines is black steel pipe. This material is favored because it is durable and can withstand high pressure, making it suitable for transporting natural gas and propane safely. Black steel pipes are specifically designed to handle gas applications, as they do not corrode as easily as other materials and can endure the stresses associated with gas supply systems.

While other materials, such as copper, may also be used in specific situations, they often come with limitations regarding the type of gas and the pressure they can handle. PVC, on the other hand, is typically not used for gas lines because it cannot withstand the pressures and temperatures associated with gas transportation. Additionally, PVC materials can degrade over time when exposed to certain conditions, making them unsuitable for this application.

Thus, black steel pipe stands out as the appropriate choice for gas supply lines due to its reliability, strength, and compatibility with gas service requirements.