Technical calculators

Flange pressure–temperature ratings.

Maximum working pressure of ASME B16.5-2017 flange classes for a material group at the design temperature.

Flange ratings

Find the maximum working pressure.

Enter the design temperature in degrees Celsius, select the flange rating and the material group, then choose Calculate.

Design temperature (°C)

Flange rating

Flange material group (ASME B16.5-2017 Table 1A)

Maximum working pressure

bar

psig

About this tool

Flange ratings in accordance with ASME B16.5-2017: the material groups of Table 1A and the pressure–temperature rating tables in psig of Mandatory Appendix II (Tables II-2-1.1 to II-2-3.19). The pressure is interpolated linearly between the tabulated temperatures for the selected class and material group, as the standard permits.

Temperatures below 38 °C (100 °F) use the −29 °C to 38 °C (−20 °F to 100 °F) rating; the tool does not check minimum temperatures or impact-test requirements. Class 150 is rated up to 538 °C (1000 °F), except that the standard lists 20 psig above that temperature for group 1.18 up to 649 °C (1200 °F) and for group 3.19 up to 815 °C (1500 °F); the tool uses these values. The other classes are rated up to 815 °C (1500 °F). Above the last tabulated temperature for a material group the tool reports a limit instead of a pressure.

The notes to each table, which restrict some materials to lower temperatures or particular heat treatments, are not shown here. Confirm ratings against the edition of the standard named in the project specification before use.

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