What materials are appropriate for constructing NH3 piping systems?

The appropriate materials for constructing ammonia (NH3) piping systems primarily include A53 Grade B electric resistance welded (ERW) and A106 Grade B seamless steel pipes. These materials are specifically designed to handle the high pressures and temperatures associated with NH3, providing the necessary strength and durability for the system.

A53 and A106 steels are commonly used in various applications due to their ability to withstand corrosive environments and their high tensile strength. A106 Grade B is particularly useful for high-temperature applications, while A53 Grade B is excellent for most general purposes in commercial piping.

Using these materials ensures the integrity of the piping system, reducing the risk of leaks or failures that could result from inappropriate materials. Other materials listed, such as plastics, copper, and PVC, do not possess the necessary mechanical properties or chemical compatibility to handle the demands of NH3 safely and effectively. Thus, materials like A53 Grade B and A106 Grade B steel are the standard choices for ensuring the safety and reliability of ammonia piping systems.