Effects of Over-Loading on Pressure Vessel Integrity

The effect of proof over-pressure on pressure vessels structural integrity is analysed. Risk based approach applied using Failure Analysis Diagramme to assess likelihood failure. Special attention paid crack-like defects detected by NDT regular testing which are unacceptable standards, but difficult be repaired. It was show, two examples, that such can remain if some strict conditions fulfilled. In any case, with or without defects, it shown significant cause much more problems than has benefits, because acts like the first step in eventual failure, being anything.