The vessel in question is a 2003 U-2 stamped vessel with a 30" pad-type flange on the top head (for clarity, the nozzle configuration is as per Fig UG-40(a-2) in Div 1). This flange has been problematic during past maintenance activities and as a result some holes have been re-drilled larger and...
I’ve just moved to a refinery (part of an international group) and am currently overseeing the piping designs for modifications to the plant. The refinery piping is designed and constructed in accordance with ASME B31.3 but I keep seeing the situation where PSVs are set at 10% above piping...
