BVPC VIII DIV 1 - DN Flange Question 3

[Jacob7]

I have a customer who wants to put a DN flange fittings on their ASME Section VIII Div. 1 vessels. UG-44 lists only B16.5 and B16.47 flanges. However, my understanding was the code essentially stops after the first weld. That is to say I could post a pipe stub coming out of the tank and have that certified/inspected. Then attach the DIN fittings later? I recall something similar being done on a tank I worked on in the past, but wanted to ask around to see what others have done.

 

[cbPVme]

Per U-1(e)(1)(-c) the scope of the code is up to the face of the first flange or bolted flange connection. The DIN flange is within the scope of ASME VIII-1 and as it is not an adopted standard, the flange must be designed in accordance with Appendix 2.

 

[TGS4]

However, you could define it as a welded connection and use the scope definition in U-1(e)(1)(-a), and then the DN flange would be outside the scope.

 

[XL83NL]

DN flange (thus saying something about the size only), or DIN flange?
The latter doesn't exist anymore, that is now included in the 'new' EN 1092-1. You could look at ISO 7005, which covers B16.5 flanges.
Otherwise, verification by ASME VIII-2 App 2 is the way to go.

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

 

[LittleInch]

Or just fir a set of fitting to fitting flanges with one side the ASME B 16 flange and the other the DIN or EN flange?

Code mismatches make people nervous and the AI might reject it.



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

 

[Jacob7]

Yes, apologies DN600 and DN100 flanges. I'm not as familiar with DN/DIN fittings as I should be.

Thank you all for the feedback/suggestions!

 

[SnTMan]

Jacob7, whichever way you choose to go, early agreement among the parties would be beneficial.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[LittleInch]

So actually just ASME B16.5 flanges, 24" and 4 " ??

Or actually flanges not to ASME B 16.5?

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