 
                            Pressure Rating Chart of Flange
Flange Pressure Rating
Flange Pressure Rating Formula
Steel Flanges Pressure Rating
Pipe Flange Pressure Rating Chart
Pressure Rating of Pipe Flanges


| 
                                                Maximum Allowable Non-Shock Pressure (Psig) | |||||||
| 
                                                Temperature (°F) | 
                                                Pressure Class (lb) | ||||||
| 150 | 300 | 400 | 600 | 900 | 1500 | 2500 | |
| 
                                                Hydrostatic Test Pressure (Psig) | |||||||
| 450 | 1125 | 1500 | 2225 | 3350 | 5575 | 9275 | |
| 
                                                -20 to 100 | 
                                                285 | 
                                                740 | 
                                                990 | 
                                                1480 | 
                                                2220 | 
                                                3705 | 
                                                6170 | 
| 
                                                200 | 
                                                260 | 
                                                675 | 
                                                900 | 
                                                1350 | 
                                                2025 | 
                                                3375 | 
                                                5625 | 
| 
                                                300 | 
                                                230 | 
                                                655 | 
                                                875 | 
                                                1315 | 
                                                1970 | 
                                                3280 | 
                                                5470 | 
| 
                                                400 | 
                                                200 | 
                                                635 | 
                                                845 | 
                                                1270 | 
                                                1900 | 
                                                3170 | 
                                                5280 | 
| 
                                                500 | 
                                                170 | 
                                                600 | 
                                                800 | 
                                                1200 | 
                                                1795 | 
                                                2995 | 
                                                4990 | 
| 
                                                600 | 
                                                140 | 
                                                550 | 
                                                730 | 
                                                1095 | 
                                                1640 | 
                                                2735 | 
                                                4560 | 
| 
                                                650 | 
                                                125 | 
                                                535 | 
                                                715 | 
                                                1075 | 
                                                1610 | 
                                                2685 | 
                                                4475 | 
| 
                                                700 | 
                                                110 | 
                                                535 | 
                                                710 | 
                                                1065 | 
                                                1600 | 
                                                2665 | 
                                                4440 | 
| 
                                                750 | 
                                                95 | 
                                                505 | 
                                                670 | 
                                                1010 | 
                                                1510 | 
                                                2520 | 
                                                4200 | 
| 
                                                800 | 
                                                80 | 
                                                410 | 
                                                550 | 
                                                825 | 
                                                1235 | 
                                                2060 | 
                                                3430 | 
| 
                                                850 | 
                                                65 | 
                                                270 | 
                                                355 | 
                                                535 | 
                                                805 | 
                                                1340 | 
                                                2230 | 
| 
                                                900 | 
                                                50 | 
                                                170 | 
                                                230 | 
                                                345 | 
                                                515 | 
                                                860 | 
                                                1430 | 
| 
                                                950 | 
                                                35 | 
                                                105 | 
                                                140 | 
                                                205 | 
                                                310 | 
                                                515 | 
                                                860 | 
| 
                                                1000 | 
                                                20 | 
                                                50 | 
                                                70 | 
                                                105 | 
                                                155 | 
                                                260 | 
                                                430 | 

Check Plate Flanges Temperature-Pressure Ratings, Pressure-Temperature Chart for Flange Rating.

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