Round to Round Transition

[ChrisF90]

I am currently designing the bottom of a Reactor that has a "round to round" transition (see attached picture). I was looking at designing it as an eccentric conical transition with an equivalent small end diameter but I am not sure this is the correct approach. Does anyone have any experience (and not just opinion) with designing a code vessel with this type of transition?

The design code is ASME Sec. VIII, Div. 1, and the center line of the small end is 30 degrees from the large end center line.

Thanks!

 

[TGS4]

This has been discussed before. There are no rules in Section VIII, Division 1 (or Division 2 for that matter) for such a geometry. See U-2(g). You're going to need to get someone to do an FEA-based design for you.

 

[SnTMan]

PVEngineerCF, hard to tell from your pic, but the construction appears to resemble a mitered elbow, which in the distant past were designed without the benefit of FEA

Unfortunately I do not know how they were designed. My apologies.

Regards,

Mike

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

 

[ChrisF90]

I appreciate the replies!

I do not completely agree that FEA is necessarily required but I agree that it would go to a U-2(g) analysis.

The only place I know where to look for a mitered elbow design is B31.3 but I do not see how to go about a mitered elbow with differing IDs at each end. Perhaps by assuming the larger ID throughout the "elbow"?

I guess what I am getting at is... Is there a method for designing this type of transition out there that's been used (besides FEA)? If not, then FEA will be the path we go with.

 

[TGS4]

There are good tools for designing mitered elbows without FEA. But not reducing mitered elbows. I guess you have your path forward.

 

[SnTMan]

Well, I did find this:

https://books.google.com/books?id=G...e&q=mitered conical transition design&f=false

Useful? Dunno...

Regards,

Mike

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