Dear moheshams,

Reply to your inqueries:

1. I will be so grateful if you give me the reference of the table.

The reference is Flanges - Ratings in Classes and Pressure Numbers (PN)

2. If I find a valve in which written for example ASME class 300 and this valve is butt weld type could I apply your table to choose another valve by PN and equivalent DN?

Yes. (Note: PN = Pressure Number = equivalent to class or rating, where DN denotes to NPS).

3. If you can introduce a reference to study about this subject I will thank you.

Sure, but I have ASME codes only, and ASME B16.5 for flanges and flanged fittings is a good reference to find the flanges dimensions and pressure-temp. ratings.

God answer as always Abdel.

milo

Thank you Milo.

DEAR SIR,

THE TABLE GIVEN BY YOU IS ABSOLUTLY CORRECT. I FOUND THESE EQUIVALANT PN TO ASME CLASS ARE GIVEN/USED IN CANDIAN STANDARD 'CSA'AND FFRENCH STANDARD 'NFE'. AS THEY HAVE ADOPED ASME CLASS FLANGES IN THERE STANDARD. NARMALLY PN ARE10,16,25,40,63,100,160 AND SO ON.GIVEN IN DIN AND EN STANDARD. NOW FOR ALL EUROP FLANGE STANDARD IS ' EN 1092-1:2007'.

THANK YOU.

V.D.DEODHAR.

PN(pressure number) 20=ANSI 150

PN50=300 #ANSI,PN68=400#ANSI,PN100=600# ANSI,PN150=900#,PN250=1500# ANSIand PN 420=2500 ANSI

What is PN40 equivalent to?