ASME Heat exchanger with tubesheet cutout, a asymmetrical tube layout, rectangular tubesheet

[jimmyhutmacher]

Any advice on the following would be greatly appreciated. I've been tasked with doing the ASME Section VIII code calculations for a heat exchanger. However I think it is out of the scope of part UHX for the following reasons: It has a segment of a circle (moon) shaped cutout in the tubesheet, an asymmetrical tube layout and while the shell is cylindrical, the outer shape of the tubesheet is a rectangle. The attached picture should help explain. Can I use part UHX? If not, is there another resource? FEA the only option? thanks!

 

[SnTMan]

jimmyhutmacher, you can likely run this tubesheet in Part UHX, but what will you get? I wouldn't especially trust the output.

Your best bet short of FEA might be a UG-34 calculation perhaps incorporating a ligament efficiency. You could perhaps treat the plate as round. The cutout will not be adequately addressed by this approach of course.

I think you are stuck

Regards,

Mike

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

 

[jimmyhutmacher]

Thanks for the reply. I agree that one couldn't trust the results of Part UHX. the biggest problem is that in both UG-34 and part UHX, the cutout cannot be address and will greatly affect the strength of the tubesheet. This is why I think finite element analysis might be the only option but we don't have that capability at our office and we've already been awarded the job. Any help would be appreciated!! thanks, in advance

 

[SnTMan]

Oh, you really are stuck

All I could suggest is full area replacement on the opening.

Regards,

Mike



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