PN10, 16, 40 mating flanges according to EN 1092-1

[escapadro]

Hey guys,

I've looked around some other threads and other links that Google has spewed back at me, but I thought I'd double check with piping experts here.

It's a very simple query from a non-piping engineer (I'm automation). We have a tank with an EN 1092-1 nozzle, named K1, of size = DN80. It's annotated as PN10.

I have specified a differential pressure level transmitter on the tank, but the instrument vendor has indicated, that the lowest PN rating they can meet is PN40.
I was trying to verify if I can mate the instrument with the flange on the tank (PN10 vs PN40 for 80mm flange, dimensionally-speaking).

Can someone confirm, that having two different PN-rated flanges, but of the same dimension, will work?

Thank you!

 

[The Obturator]

DN80 PN10 & PN40 Flanges have the same dimensions. Note your pressure rating will be as per the lowest rating PN10.


*** Per ISO-4126, the generic term
'Safety Valve' is used regardless of application or design ***

*** 'Pressure-relief Valve' is the equivalent ASME/API term ***

 

[LittleInch]

Escapades,

You are fortunate about this and it may not apply for different sizes. Above DN 80 they vary.

The PN40 flange is a little thicker at 24mm vs 20.

This excellent site allows you to see the different dimensions for different sizes and PN no.

https://www.wermac.org/din/dim_wn_flg_pn40.html

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[escapadro]

Hey guys,

Thanks a million for your responses.

The differences are subtle. I am looking at a valve now, where the piping spec indicated connection to be a raised face flange, PN 10.
The valve body is DN100. It's specified with a PN-10 flange, which, according to LittleInch's chart varies in almost every dimension. See attached snippets.

Are we ok or it'll be impossible to mate DN100 PN-40 flange with a pipe's PN-10 flange?

I'm sorry, I've always been a little confused between ASME vs PN.

Thanks guys!

 

[XL83NL]

Do you have a copy of the EN 1092-1 standard? At this point, if you don't own a copy, this would be a very good moment to make that little investment.

Huub
- You never get what you expect, you only get what you inspect.

 

[escapadro]

Hi XL83NL,

Do you know what, I would have to check if I can get my hands on it - I do realize it's probably a good thing to have on hands, but for us, automation guys, it rarely becomes a necessity. These queries above are more once-off questions, that would allow me to educate myself further once I know I'm not completely off the rail here!

 

[LittleInch]

You're not OK at DN100.

They just won't fit without use of a 5lb hammer...

Don't do it.

Find an instrument which is supplied with a PN10 flange

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.