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Hey LI, Lets say the vessel is going to fail the level 2 FFS since the corroded area is located next to a structural support and will require a level 3. At this point the options would be to repair or rerate, does code specify how long I can operate that vessel before I need to make the repair?

Hi All, I can't seem to find an answer for this but for example lets say I have a vessel with a design pressure of 250 psi. The vessel has some general thinning at a well known rate and upon inspection has shown to be below design tmin. However the vessel operates at 50 psi. How long can the...