Tubesheet with Hub
Tubesheet with Hub
(OP)
Hello All,
We are designing the tube sheet with hub for fixed type shell & tube exchanger per ASME Div I, so we i refer UW-13.3.
Is there any calculation for this design, as UHX only says about tube sheet thickness, and for hub thickness i can use UG-27.
My question if i want to switch from UW-13.3 to UW-31.2 h do i need to show some calculation, if yes what i have to refer.
We are designing the tube sheet with hub for fixed type shell & tube exchanger per ASME Div I, so we i refer UW-13.3.
Is there any calculation for this design, as UHX only says about tube sheet thickness, and for hub thickness i can use UG-27.
My question if i want to switch from UW-13.3 to UW-31.2 h do i need to show some calculation, if yes what i have to refer.





RE: Tubesheet with Hub
Normally, if using a hub it would match the shell cylinder thickness, and UG-27 would apply if mismatching for some reason.
For a corner joint such as UW-13.2 it is only necessary to meet the required weld dimenisons.
Part UHX does not consider, in any way so far as I know, the design of the attachment of the tubesheet to the cylinder(s), this design is covered elsewhere, such as in Part UW. Note however that Part UHX calculations depend on the type of attachment.
Regards,
Mike
RE: Tubesheet with Hub
Quite clear, thanks.
RE: Tubesheet with Hub
With reference to this thread, I understood that weld joint for tube sheet to shell shall be determined by UW 13 and UHX says about tube sheet thickness depending on type of tube sheet.
Now what if, if the actual work weld thickness is 1 or 2 mm less than specified in UW, e.g. In my case the ts (sheel thickness) is 28 mm and as per UW 13.2 (h) the a (weld size) shall be same as ts I.e. 28 mm but per actual work it is 26.0 mm.
Now do we re weld and hydro test or is there any calculation to back this.
Please advise.
RE: Tubesheet with Hub
Regards,
Mike
RE: Tubesheet with Hub
RE: Tubesheet with Hub
Mi comment is not related this thread. I red in another thread that you have one spreadsheet for davits calculation.
How Can I get it?
Regards
Enrique
RE: Tubesheet with Hub
What you need to do is Start a New Thread! Then you can referernce the previous thread number by doing thread794-xxxxxx (you'll find the number right under the title). When you don't put any space between the word thread and the first number, as in my example, it will automatically link to the thread.
Then if Aodwan is in a generous mood, he'll provide a link to his spreadsheet. But there's no guarantee, as he probably put a lot of time and effort into developing it.
And maybe it's because my background is nuclear and I have to meet this horrible thing called "quality assurance requirements" -- but how do you assure the provenance of a spreadsheet you get over the Internet?
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RE: Tubesheet with Hub
Haven't you heard that the ISO in, for example, ISO 900X means "Internet Sourced Only"?
rmw
RE: Tubesheet with Hub
Sometimes it seems that way.
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RE: Tubesheet with Hub
Then the tube sheets would be fillet weld to the inside of the shells at the front edge of the hubs