How can you compare ANSI Class and nominal pressure?
ANSI Class and nominal pressure specify the pressure load capacity of fittings. ANSI uses "Class" to indicate pressure levels according to American standards, while nominal pressure (PN) corresponds to the European DIN standard. Charts and tables are helpful for conversions, as both systems use different reference conditions.
Properties of ANSI Class and Nominal Pressure
The pressure rating defines the maximum allowable pressure that a flange can withstand at a given temperature. According to the specification ANSI/ASME B16.5, there are the following seven flange pressure ratings: Class 150#, Class 300#, Class 400#, Class 600#, Class 900#, Class 1500#, and Class 2500#.
In the table presented, these ANSI flange pressure ratings are assigned to the nominal pressure. However, the respective working pressures must be obtained from the corresponding pressure-temperature ratings, depending on the material and temperature.
The terms "pressure rating," "class," "#," "Lb," or "Lbs" are not strictly defined; they all refer to the pressure-temperature rating of a flange.
ANSI Class Rating | ANSI Class Rating |
|---|---|
| Class #150 | 20 |
| Class #300 | 50 |
| Class #400 | 64 |
| Class #600 | 100 |
| Class #900 | 150 |
| Class #1500 | 250 |
| Class #2500 | 420 |
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