Hi Harpreet, Thanks for this. Doing that essentially make all pipe sizes of 1 rating (saying 300lb) compatible with another rating (say 600lb) which is not entirely correct. For example, between 300lb and 600lb ratings, only 3" pipes and smaller have the same bolting arrangement (same dia. of bolt circle, bolt size, bolt qty) For 3-1/2" pipe and larger, the bolting arrangement for 300lb rating is different from 600lb rating. So a 4" 300lb flange shouldn't be able to connect to a 4" 600lb flange. Is there anyway to prevent that connection? Best regards, Tuan
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