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For a gasketed flanged joint , when the bolts starts yielding the joint integrity is lost and leakage starts(joint failure is a leak).For such an application yield stress is the basis of design. For a non gasketed joint , leakage is not the criteria. Although exceeding the yield stress will...

It is a Flare line. Designed for 50 Psig @ 815 F. Normal operating pressure is 5 to 10 Psig.The line is insulated and electrically heat traced, for freeze protection. Original design calculations for saddle are not available.I believe that piping desiner has overlooked the fact that the...

A 60" piping (D/t=150) & sees thermal cycles have encountered cracking and inward denting at three circumferential butt welds. The pipe has developed ovality due to improperly designed saddle support( saddle angle is just 70 deg). Excessive stress exists on the horn of the saddle.Does it...

I am aware of successful hydotest on packed and trayed towers with internals in the field. Such internals are not exposed to a differential pressure .