Back to the question at hand:
unclesyd,
How do you know it will take 7100 psig to start permanent deformation?
Is there a specified %SMYS not to be exceeded?
dcasto,
The minimum yield strength for the flanges is 50,719 psi.
The minimum yield strength for the pipe is 53,800 psi.
Yield strength was not exceeded during the hydrotest, thus there was no plastic deformation. We believe the pipe and flanges to still be usable but wanted to confirm.
unclesyd,
The pipe is 6" sch 120 A-106 GR B
Flanges are 6" RTJWN 900# sch 120 A-105
There was leaking between flanges during the hydrotest, which was abruptly stopped after this was noticed.
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