Design as per UHX

niraj_kuwait · **Posted:** Thu Jun 28, 2007 9:28 am

If we design tube sheet with uhx, tube to tube sheet joint should be welded only , UHX not permits joint as expanded ! My inderstanding is correct?plz clarify as per code.

Frohnert · **Posted:** Thu Jun 28, 2007 1:26 pm

Hello,
Why do you think UHX does not permit expanded tube joints? The expanded length is even considered in the calculation of the tubesheet thickness. Please have a look at Fig. UHX-11.1 sketch (b).
The explanation for l is as follows:

Code:

ltx = expanded length of tube in tubesheet (0 ≤ l tx ≤ h) [see Fig. UHX-11.1(b)]. An expanded tube-to-tubesheet joint is produced by applying pressure inside the tube such that contact is established between the tube and tubesheet. [...]

Michael

niraj_kuwait · **Posted:** Sat Jun 30, 2007 6:54 am

Thanks Frohnert

akonrad · **Posted:** Mon Jul 02, 2007 3:14 pm

Niraj,
I would recommend to consult your AI and ensure how he wants you to demonstrate strength of this connection. Usually qualification per Appendix A is acceptable, but as there are no mandatory provisions for expanded tubes, U-2(g) applies, and an accord with the Inspector is necessary.

Design as per UHX

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