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The Flour paper is very informative and paints a somewhat disturbing picture.

SnTMan, All the formatting in italics was apparently added by the system, not me. Looked better when I posted it. Yes, I agree that 20 years of successful experience has value, but no promise it won't break next week. See attached pic of vessel that was in service +/- 20 years but failed...

For me, there are 2 concerns. First is "code compliance" and second is "are these flanges safe?" In my previous life (30+ years with "Big Oil"), it was recognized almost 40 years ago, A105 flanges were a problem in low temperature service and most bigger companies with lots of tech resources and...

Vessels are already built and in operation (20 years).

The 2019 B&PV Sect VIII code changed the UCS-66 curve for as forged A-105 flanges from the b curve to the a curve which has the result of increasing the MDMT of those flanges from -20 to +18 deg F. I have a client with C3 refrigeration vessels with MDMT of -20 deg F that have as forged A-105...