What is the maximum pressure allowed for a Class 150 flange?

The maximum pressure allowed for a Class 150 flange is specifically designated at 285 PSI at ambient temperature. This classification is part of the flange pressure rating system established by standards like ASME B16.5, which provide guidelines on the pressure and temperature ratings for various types of piping components.

In terms of why 285 PSI is the correct figure, it reflects not only the design and materials used in the flange construction but also accounts for factors such as temperature. As temperature increases, the allowable pressure rating often decreases, which is a crucial consideration in applications involving thermal fluctuations. The 285 PSI rating for Class 150 flanges is tailored to ensure safety and integrity in operations that are typical for this class of piping system.

Other options suggested different maximum pressure ratings that do not align with the established standards for Class 150 flanges. These values do not correspond with industry practices, reinforcing the importance of referencing accurate pressure classifications when working with piping systems. Understanding these classifications is vital for ensuring compliance with safety regulations and maintaining the reliability of pressure piping systems.