Hello all. I have been lurking around here for a while and finally joined. It seems as though there is an abundance of knowledge on this site. I was a welder for a long time and now I have taken on a role as an inspector. During my time as a welder I didn't pay too much attention to some of the finer details. Now I am required to pay attention to this stuff. Anyway, my question is how is it that a line can be designed using say a 900# flange with a branch having a 1500# rating and 3000# valves. I don't exactly understand the difference between how a valve might be rated vs. a flange or how a line would be flange rated with different classes involved. I would assume the line could only be rated to the lowest rated flange class. And what about o-let ratings? Any insight to this inquiry would be greatly appreciated. Thanks
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