Class Breaks at Flanges
Class Breaks at Flanges
(OP)
I have seen that "Class changes should never occur between flange sets, even if it is possible to align the mating flange bolt holes. Always change classes at welds (e.g. at a flange weld neck to pipe weld). This usually isn't clearly shown on P&IDs, but should be on your physical piping dwgs."
Can anyone cite a specific code requirement for this, or is it just a best practice?
Can anyone cite a specific code requirement for this, or is it just a best practice?





RE: Class Breaks at Flanges
So it's really a practical issue.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Class Breaks at Flanges
Independent events are seldomly independent.
RE: Class Breaks at Flanges
David Simpson, PE
MuleShoe Engineering
"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
The plural of anecdote is not "data"