heat exchanger tube expansion
heat exchanger tube expansion
(OP)
what is really the point to expand the tube after welding.
is it has something to do with the liquid flow efficiency or is it because to close the gap between the tube and tubesheet on the inside??
is it has something to do with the liquid flow efficiency or is it because to close the gap between the tube and tubesheet on the inside??





RE: heat exchanger tube expansion
I once saw a very high pressure Hx where they forgot to roll one entire row of one half of the TS and the weld was a seal weld only but the Hx survived for over 20 years and when it failed it failed for reasons other than the forgotten row. Now, on the other hand, would I on that basis not roll - not for a minute.
rmw
RE: heat exchanger tube expansion
but i believe that most of the tube to tubesheet weld is a strength weld. where tube is protruded about 2mm from the tubesheet and welded with gtaw process. tubesheet hole is also bevelled. how is tube to tubesheet seal weld configuration??
RE: heat exchanger tube expansion
The other reason to roll is that the span for vibration purposes is shortened.
I have seen tubes fracture in HX with thick tube sheets when the tubes vibrate and bend when hitting the back face of the tubesheet.
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Plymouth Tube