What is the classification of NH3 pipes that are between 2" and 10" in diameter?

The classification of NH3 (ammonia) pipes that are between 2" and 10" in diameter is categorized as Schedule 40, which is commonly referred to as Sch 40. This classification indicates a specific wall thickness that is suitable for handling the pressure and operating conditions commonly associated with ammonia piping systems. Schedule 40 pipes are generally used in applications where strength is necessary to withstand the pressure of gaseous and liquid ammonia.

In the context of ammonia, it is essential to select the appropriate schedule to ensure safety and reliability. Schedule 40 provides a good balance between strength and weight, making it a preferred choice in many industrial applications involving ammonia.

Other schedule options such as Schedule 20, Schedule 10, and Schedule 60 are either too thin or too thick for optimal performance in this specific range of diameters for ammonia applications. Each schedule has its own applications and limitations, and Schedule 40 is specifically designed to meet the requirements posed by ammonia's physical and chemical properties.