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PN - Pressure Nominal Flange Ratings
- garzabla
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For example they quote FLANGE WNRF NPS 12 PN 100 12.7mm WT
In ASME a PN 100 is Equivalent to ASME 600#
It seems confusing and unnecessary to give only this PN description when everyone is used to the "normal" rating description of 600#
It is even more confusing that in the European standard EN 1092-1 (old DIN) an ASME 600# Flange is equivalent to an EN 1092-1 PN 40 Flange
At least this makes some sense as the European PN units are bars and 40bar=580psi
Why is the ASME PN system different or even used?
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- Jop
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The PN number designation is not ASME, it is the European Metric Standard. You are just going to have to live with it.
ASME/ANSI Flange Class (FC) = PN#
FC = PN#
150 = 20
300 = 50
400 = 68
600 = 100
900 = 150
1500 = 250
2500 = 420
Do it once and Do it Right
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- Anton
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Use the search button, there is lots of great info available.
Flanges - Ratings in Classes and Pressure Numbers (PN)
- If you're the smartest person in the room ... you're in the wrong room.
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- garzabla
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At least this makes some sense as the European PN units are bars and 40bar=580psi
So what is the basis of your table where ASME 600# is equivalent to PN 100?
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- pvaladares
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garzabla wrote: Jop I don't think your table is the European Standard, as I said above - In the European standard EN 1092-1 (old DIN) an ASME 600# Flange is equivalent to a PN 40 Flange.
At least this makes some sense as the European PN units are bars and 40bar=580psi
So what is the basis of your table where ASME 600# is equivalent to PN 100?
The aforementioned conversion can found here . It also matches the image provided by Anton.
from 'engineeringtoolbox.com' wrote: Piping Class Ratings based on the ASME B16.5 - Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard - class and the corresponding ISO 7005 PN (Pression Nominal*) ratings
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