Flange Pressure & Temperature Ratings

Use our flange pressure and temperature ratings guide to help identify the allowable working pressure of common flange classes at different operating temperatures.

Flange pressure ratings are affected by both the pressure class and the operating temperature, as well as the material from which the flange is manufactured. As temperature increases, the maximum allowable working pressure of a flange will typically reduce, making it important to check the correct pressure-temperature rating when selecting valves, pipework and associated equipment.

This reference is useful for comparing common flange pressure classes such as Class 150, Class 300, Class 600, Class 900, Class 1500 and Class 2500, helping engineers, specifiers and maintenance teams select suitable components for industrial and process applications.

Our flange pressure and temperature tables are intended as a convenient technical reference when specifying industrial valves, safety valves, pressure reducing valves, isolation valves and pipeline equipment.

Always ensure that the flange material, pressure class, operating temperature and applicable design standard are suitable for the intended service conditions before installation.