Hi
I presume that the test failed due to flange leakage, or pr drop due to enviorment or any other reason except weld leakage.
I am also sure that for such a High pressure, it is 100% RT joint and assume all your joints are of qood quality,
No codes and standards specify about about howmany times we can do hydro test and intervals between tests. I am not sure whether any specs limit the repetition of testing on a spool.
Test pressure is arrived at by considering yield strength of the materials. so we can safely say materials and joints would not be stressed upto Yield point.
so, if you do one or two more time, it would not be a problem.
But as a suggestion, and as being DSS, i would say you first do the testing at Design pressure and hold it for 15 minutes, observe for any leakages, then you can raise the pressure to Test pressure.
After pressure test, you may want to do 100% PT to detect any surfaces flaws.
Thanks
Murugesan
On Thu, Aug 11, 2011 at 7:15 PM, prashant pansare <prashantpan_99@yahoo.co.in> wrote:
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