All,
Thanks for your help!
ASME VIII div.1 appendix A specifies indeed exactly the tests that need to be performed in these kind of situations.
Kind regards,
Joost
Thanks for your answers so far.
Herewith some more information:
The expanded connention has not been qualified by means of pull-out test.
A hydrotest test does not necessary mean the connection is leak-tight.
for example:
A tube-bundle can pass a hydrotest @ 30 barg, however the same bundle...
We have new air-cooler bundles, with Duplex tubes expanded in 316 headerboxes.
The tubes have been expanded in accordance with API 660.
Principle of the connection is plastic deformartion of the tubes into the grooves of the tubesheets.
As the yield strength of duplex is 2,5x yield strenght of...
