Questions regarding hydraulic testing
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During the hydraulic test, if the thickness is insufficient, is the corrosion allowance taken into account in the strength calculations?
Under normal circumstances, there will be no issue with insufficient strength; in special cases, such as pressure testing fixtures, this approach can be used.
I just don’t know what the author means by insufficient thickness. The thickness during the pressure test is the nominal thickness, which of course includes the corrosion allowance.
When it has not been corroded, this corrosion allowance can of course be taken into account. However, if the calculated thickness of this device is insufficient during pressure testing, then it is not a qualified product.
I’m not sure what you mean by \"insufficient thickness\" – this kind of problem shouldn’t occur under normal circumstances. If there’s an error in the design calculations, then that’s the issue
What was said on the 2nd floor makes sense; in normal pressure testing, stress checks are carried out using the effective thickness of the cylinder. However, in cases where the pressure on the shell side of a heat exchanger is lower than that on the tube side, pressure testing fixtures may be required at the tube ends, and in such situations there is no need to consider a corrosion margin.
I wonder when the pressure test carried out by the original poster was； In the case of a hydrostatic test conducted after the manufacture of a pressure vessel, if the thickness is insufficient, it indicates that the design of that vessel is unsatisfactory ； If a hydrostatic test conducted during a regular inspection reveals that the wall thickness does not meet the requirements, then the possibility of using the container at reduced pressure should be considered.
New equipment should not have problems with insufficient thickness during hydraulic testing. Could it be that the container needs to undergo a hydraulic test as part of its regular inspection, and the thickness measurement turns out to be insufficient? If that’s the case, the only option is to reduce its level of use.
4L is right; the thickness indicated on the drawings already takes into account the corrosion allowance as well as the negative deviation of the steel plate. What does LZ mean by insufficient thickness? As long as the effective thickness is sufficient, the equipment can be considered safe