Analysis of Tubesheet when welded directly to hemi-head without skirt
Analysis of Tubesheet when welded directly to hemi-head without skirt
(OP)
ASME Sect. VIII UHX provides tubesheet analysis when a cylinder is attached to the tubesheet but not when a hemispherical head is attached to the tubesheet. I would appreciate any leads on some methodolgies already published on this subject.





RE: Analysis of Tubesheet when welded directly to hemi-head without skirt
is on the cylindrical part "skirt", and is taken as a cylindrical part
The hemi is calculated separately for t or p,
ER
RE: Analysis of Tubesheet when welded directly to hemi-head without skirt
RE: Analysis of Tubesheet when welded directly to hemi-head without skirt
It is also to properly transmit the loads of the head at pressure to the tubesheet. There is HEI and EPRI information about the radius of the transition of the lip to the tubesheet itself.
Quality manufacturers of high pressure Hx's use from 4-1/2 to 9 inches for this lip dimension. (And yes, I have seen HP heaters without any lip, fact stranger than fiction. Poor outer rows of tubes.)
So, wouldn't the "lip" mentioned above qualify for the cylindrical attachment that you are questioning regarding the tubesheet analysis, assuming we are not talking about the skirt end.
I don't know about this regarding LP Hx's using hemi head channels.
rmw
RE: Analysis of Tubesheet when welded directly to hemi-head without skirt
U-2(g). You can still use UHX for the rest of the design if you choose and your AIA agrees.
rmw does have a good point. How do you plan to attach?
See Code Case 2429. There are updates for UHX coming out next year.
RE: Analysis of Tubesheet when welded directly to hemi-head without skirt
rmw
RE: Analysis of Tubesheet when welded directly to hemi-head without skirt
RE: Analysis of Tubesheet when welded directly to hemi-head without skirt
RE: Analysis of Tubesheet when welded directly to hemi-head without skirt
We also had some hemispherical heads that had a short straight flange and attached to the tubesheet the same way.
We had two from a well known manufacturer that had the tubesheet inserted in hemispherical head a.k.a socket weld.