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Flanges - Ratings in Classes and
Pressure Numbers (PN)
Pressure numbers (PN) compared to
flange class designations
| Flange
Class |
150 |
300 |
400 |
600 |
900 |
1500
|
2500
|
| Flange Pressure
Number, PN |
20 |
50 |
68 |
100 |
150 |
250 |
420 |
|