reduction in tube thickness due to over expansion
reduction in tube thickness due to over expansion
(OP)
It was happened the over expanding for shell and tube exchanger during the expanding work.
(Tube min. required Th’k : 2.77mm, Tube Th’k after expanding : 2.70mm)
IS this acceptable?
(Tube min. required Th’k : 2.77mm, Tube Th’k after expanding : 2.70mm)
IS this acceptable?





RE: reduction in tube thickness due to over expansion
And then how do you know what the wall is after rolling? I would like to see that method.
In general, yes people accept this situation since this is fully backed by the tubesheet.
If they did this though I would be double checking the depth of roll and other details.
Were these rolled using a torque limit?
Did any of the tubes in the mock-up show this condition?
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P.E. Metallurgy, Plymouth Tube
RE: reduction in tube thickness due to over expansion
Please let me correct my question above. Actually my vendor has come with excuse that he has over expanded the tubes lengthwise. Which means it is expanded beyond the inner face of tubesheet.
Even though thinning of tube is not much in this area (just 0.07mm), where required tube thickness is just 0.5mm for pressure and temp, TEMA do not allow this.
What could be solution in such case.
RE: reduction in tube thickness due to over expansion
RE: reduction in tube thickness due to over expansion
RE: reduction in tube thickness due to over expansion
This is clearly a fabrication error.
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P.E. Metallurgy, Plymouth Tube
RE: reduction in tube thickness due to over expansion
RE: reduction in tube thickness due to over expansion
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: reduction in tube thickness due to over expansion
9.10.3 The minimum length of expansion shall be in accordance with TEMA Section 5, Paragraph RCB-7.1.
However, in no case shall the expansion extend within 3 mm (1/8 in.) of the shell side face of the tubesheet.
Regards
r6155
RE: reduction in tube thickness due to over expansion
RE: reduction in tube thickness due to over expansion
A.4.4.1 If there is potential for crevice corrosion on the shell side, tubes should be expanded to within 3 mm (1/8 in.)
from the shell side face of the tubesheet.
2)Which is the proposal of the vendor?
Regards
r6155