ASME/ANSI B16.5 requires flanges to be:

ASME/ANSI B16.5 requires flanges to be:

• A. Stamped with the service pressure value.
• B. Stamped with the working pressure.
• C. Marked with the material grade.
• D. Marked with the class rating.

Answer: (D)

The main idea is that flanges are identified by a standardized pressure class. ASME/ANSI B16.5 marks flanges with their class rating (for example, Class 150, Class 300, etc.), which defines the maximum allowable pressure the flange can safely handle at a given temperature. This class rating provides a consistent, temperature-dependent reference used to match flanges with piping, gaskets, and other components in a system. Stamping a service or working pressure isn’t the standardized identification B16.5 requires, because those values vary with temperature and other factors. Material grade markings may appear for traceability, but the essential marking designers and inspectors rely on to assess compatibility and safety is the class rating.

The main idea is that flanges are identified by a standardized pressure class. ASME/ANSI B16.5 marks flanges with their class rating (for example, Class 150, Class 300, etc.), which defines the maximum allowable pressure the flange can safely handle at a given temperature. This class rating provides a consistent, temperature-dependent reference used to match flanges with piping, gaskets, and other components in a system. Stamping a service or working pressure isn’t the standardized identification B16.5 requires, because those values vary with temperature and other factors. Material grade markings may appear for traceability, but the essential marking designers and inspectors rely on to assess compatibility and safety is the class rating.