What type of piping is typically used for gas installations?

The use of Schedule 40 black steel piping for gas installations is primarily due to its ability to withstand high pressure and resistance to corrosion. This type of piping is strong and durable, making it well-suited for the transport of natural gas and propane in various applications. The material also has the necessary fire-resistance characteristics, which is critical for safety when dealing with flammable gases.

Black steel pipe's structure is designed to handle both the internal pressure from the gas being transported and external environmental factors. Moreover, it is joined using threaded connections or welds, allowing for a reliable and secure seal that is essential in preventing gas leaks.

Copper tubing, although sometimes used for gas, is less common due to cost and the fact that it may not meet certain local codes regarding gas installations. CPVC and PEX are primarily designed for water transport and are not suitable for gas installations because they lack the mechanical strength and heat resistance required for safely handling gas.