Which piping material must meet Type K or Type L standards?

Copper tubing must meet Type K or Type L standards because these classifications relate specifically to the wall thickness and pressure handling capabilities of copper pipes. Type K has the thickest walls and is often used for underground or high-pressure applications, while Type L has medium thickness and is used in standard plumbing applications.

These standards ensure that the copper tubing is durable enough for handling gas, which is critical for safety and functionality in propane and natural gas systems. This classification is pertinent because gas systems must be built with materials that can withstand the pressures and potential stresses they encounter.

Other materials listed, such as plastic pipe, cast iron, and galvanized pipe, do not fall under these classifications. Plastic pipes are not suitable for high temperatures associated with gas applications, cast iron is generally used in heavy-duty applications but does not have the same flexibility as copper, and galvanized pipe, while sometimes used for other plumbing applications, does not meet the same standards set for copper tubing under Type K or Type L guidelines. Understanding these specifications helps ensure compliance and safety in gas distribution systems.