Which type of pipe is outdated and typically not installed in modern gas distribution systems?

The type of pipe that is considered outdated and typically not installed in modern gas distribution systems is cast-iron. Cast-iron pipes were widely used in the past due to their durability and resistance to pressure. However, advancements in materials have led to a shift toward more modern options that are lighter, more flexible, and easier to install.

In contemporary gas distribution systems, plastic and polyethylene pipes are favored for their corrosion resistance, lower weight, and ease of handling. Steel pipes are still in use but are also being replaced by newer materials in many applications due to the risk of corrosion and the heavier weight. This shift toward more advanced materials reflects a commitment to safety, efficiency, and longevity in gas distribution systems, making cast-iron pipes less desirable in modern installations.