Many thanks to all the pressure vessel experts who have been kind enough to reply and contribute to my question.Judging from the diverse range of replies it seems that we have not bottomed this one out yet.It seems to me that the questions I have posed in the first part of my note are valid. Also, I think the second part of my question was slightly misunderstood.However, that is my fault and I apologies. I should have phrased the question better.
The question should have read as follows:
Once the vessel has been in operation and requires revalidation, what is the benefit of rehydrotesting and are there better ways of going about the revalidation process than simply pressurising the structure upto the original pressure test value.
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