FLANGE PN

[santoshdada]

dear friend
can anyone clear my confusion

what is PN for a flange is it Pressure No or Nominal pressure for eg PN16 what is 16 is it 16 bar or else and is there any equvelent class wrt PN as i know

Flange Class 150 300 400 600 900 1500
PN 20 50 68 100 150 250

then who orignate Flange class/PN

what is the equvent rating of PN10/PN16/PN25/PN40 etc plz provide complete chart if available
thx in advance

 

[pch1]

PN - Alphanumeric designation used for reference purposes related to a combination of mechanical and dimensional characteristics of a component of a pipework system.

For a clear and concise definition see BS EN 1333:2006, it is a four page document and in my opinion is not necessarily needed.

For flange ratings the following standard is available (It is a 123 page document and I am unable to post it).
BS EN 1092-1:2007 Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated.

Similar to ASME B16.5, the pressure ratings of flanges in BS EN 1092-1 change with respect to temperature and material group.

 

[pch1]

For equivalent ratings to Class 150, 300, 600 etc - see TC Piping catalogue (Trouvay and Cauvin).

TC have listed the following in their Flange section:
ISO PN 20 - Class 150
ISO PN 50 - Class 300
ISO PN 68 - Class 400
ISO PN 100 - Class 600
ISO PN 150 - Class 900
ISO PN 250 - Class 1500
ISO PN 420 - Class 2500

 

[santoshdada]

DEAR PC THX CAN U PLZ SEND ME THREE PAGES DOCUMENT ON BS EN 1333:2006, WAHT U HAVE WRITTEN

U HAVE GIVEN ME SAME PN/CLASS WHAT I HAVE ALREADY GIVEN
CAN ANY ONE GIVE ME EQUIVELENT TO PN10/PN16/PN25/PN40 CLASS

MY QUESTION IS STILL ON SAME STAND


THX

 

[JLSeagull]

Refer to ASME B16.5 and ISO 7005-1.

The working class ratings correspond nearly to the 38 degree C pressures m in bar. I looked at several material group pages on my other screen and see that Class 150 corresponds near 20 bar. Actial values depend upon the material group. Cclass 300 is near 50 bar, 400 near 68 bar, 600 near 100 bar, 900 near 150 bar, 1500 near 250 bar and 2500 near 425 bar. Additional cast iron flanges may be covered in ASME B16.1. I don't use cast iron and haven't downloaded the standard.

In order to maintain compatibility with the flanges defined
in ISO 7005-1 and the flanges in the American National Standard ASME B16.5, many some valves may be PN-marked for OSO and Class-marked for ASME. I also lack a copy of most ISO standards. PN 6, 10 and 16 are mentioned in ISO 5625. ISO 5752 mentions PN 20 and 40. This International Standard specifies the basic series of face-to-face or centre-to-face dimensions for two-way metal valves used in flanged pipe systems. Each basic series of face-to-face or centre-to-face dimensions may be used as required with flanges of mating dimensions conforming to IS0 2084 or IS0 2229.

A summary description of ISO 5752 reflects the range of pressure ratings in PN values of 1 - 1,6 - 2,5 - 4 - 6 - 10 - 16 - 25 and 40. and classes 125 - 150 - 250 - 300 and 600; and the range of nominal sizes in DN values of 10 - 15 - 20 - 25 - 32 - 40 - 50 - 65 - 80 - 100 - 125 - 150 - 200 - 250 - 300 - 350 - 400 - 450 - 500 - (550) - 600 - (650) - 700 - 750 - 800 - 900 - 1000 - 1200 - 1400 - 1600 - 1800 and 2000.

 

[stanier]

PN10/PN16/PN25/PN40 CLASS are generally used in the water industry not petrochem. Hence reference to ASME B16.5 equivalents are not appropriate.

For the water industry where temperature is not a factor for de-rating you can assume that the PN10 is a 10bar (1000kPa) rating. Similar for the other classes.