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Flanged Joints in Piping Stress Analysis

Flanged Joints in Piping Stress Analysis

Flanged Joints in Piping Stress Analysis

(OP)
It is very frequent to face the problem of the check of flanged joints carrying out the stress analysis of very small size piping systems (around a couple of inches NPS).
In general such systems results to be extremely sensitive, in particular to thermal expansion and even for small variation of temperature. Systems with a very low stress rate affecting the pipe often fail the flanges check per the method of the equivalent pressure.
It is the opinion of many designers that this does not reflect an overstress of the flange nor an actual risk or leakage.
My question is: is there any recognized criterion allowing that the check of small size flanges can be disregarded ?
I remember to have seen Piping Design Criteria including the request of check for flanged joints subject to bending moments only for sizes over 6 or 8 inches.

Thanks

Roberto Maierna

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