Which of the following types of carbon steel NH3 pipes are used for vapor?

The correct choice identifies types of carbon steel pipes suitable for handling ammonia (NH3) vapor. Specifically, it includes A333, which is designed for low-temperature applications, and A53, which can be utilized in various contexts, including vapor transmission.

A333 offers good toughness and ductility, making it suitable for low-temperature environments where ammonia might be present, ensuring the pipe can withstand the specific demands when carrying vapor. The A53 pipe, available in both ERW (Electric Resistance Welded) and seamless forms, is widely used in plumbing and industrial applications, providing a reliable option for vapor transport in various conditions. Additionally, A106 is commonly used for high-temperature service, enhancing its compatibility with gaseous ammonia applications.

This selection of pipes collectively addresses the mechanical properties and application requirements critical for the safe transport of ammonia vapor, making them appropriate for such usage in high-pressure piping systems. Understanding these standards helps ensure the integrity and safety of piping systems in relevant industrial operations.