MTRs vs Stamping of Flanges
MTRs vs Stamping of Flanges
(OP)
What is the overiding factor between Material Test Reports and stamping of Flanges. It the flange MTR says the Yield Strength is 49,000 of that particular Flange but the Flange is stamped as Grade B (which is 35,000), what can you go by? I can not find any specs on this information.





RE: MTRs vs Stamping of Flanges
RE: MTRs vs Stamping of Flanges
As far as "what do you go by" that's pretty simple: You go by the material grade, not tested values unless you are playing in Fitness For Service land. Imagine the problems industry wide if everyone used MTR values and tried to adjust their allowable stresses accordingly for all of the forgings, pipe, and plate they are using for vessels and piping. Go back and evaluate a 30 year old installation and try to find their MTR's and their philosophy on adjusting allowable stresses. Not gonna happen.
jt