PN - Pressure Nominal Flange Ratings

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9 years 8 months ago - 9 years 8 months ago #8557 by garzabla
PN - Pressure Nominal Flange Ratings was created by garzabla
I have just started working for a company in Canada who are using PN numbers instead of normal ASME Flange ratings

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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9 years 8 months ago - 9 years 8 months ago #7124 by Jop
garzabla:
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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9 years 8 months ago - 9 years 8 months ago #7125 by Anton
Replied by Anton on topic Re: PN - Pressure Nominal Flange Ratings
This information is also available in the Codes / Standards section of the site.
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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9 years 6 months ago - 9 years 6 months ago #7171 by garzabla
Replied by garzabla on topic Re: PN - Pressure Nominal Flange Ratings
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?

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8 years 2 days ago #9103 by pvaladares
Replied by pvaladares on topic Re: PN - Pressure Nominal Flange Ratings

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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