Which type of piping is commonly used for natural gas in residential installations?

Black steel pipe and Corrugated Stainless Steel Tubing (CSST) are commonly used for natural gas in residential installations due to their durability and ability to withstand the pressures associated with gas transportation. Black steel pipe is favored for its high strength and resistance to rust and corrosion, making it suitable for indoor applications where it provides a secure and reliable conduit for natural gas. CSST, on the other hand, is more flexible and lighter than traditional piping, which allows for easier installation in tight spaces and reduces the need for fittings that could lead to potential leak points.

While plastic piping, aluminum tubing, and copper pipe may be used in some gas applications or specific circumstances, they do not have the same level of acceptance and code regulation for natural gas applications in residential settings. Plastic piping, for instance, can be used primarily for underground installations and may not be suitable for all aspects of residential gas distribution. Copper tubing and aluminum are more often utilized in other applications, like water supply or heating, rather than for fuel gas delivery due to concerns about material compatibility and safety. This makes black steel pipe and CSST the more common choices for residential natural gas installations.