Hello Ranjit
Yes, it is possible to analyse double wall vessels, but in PVElite, it is not possible to produce one model on the screen to accomplish this. It would be necessary to create two models. one for the inner shell, and one for the outer shell. Ensure that that external pressure for the inner shell includes the jacket pressure and any vacuum existing in the inner shell.
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Sincerely,
Ray Delaforce
CADWorx & Analysis Solutions
Hexagon PPM