![]() If local variance has to do with the third party inspector sanction of my approch then I assume that everything is ok. The savings for going with MTR values instead of specified minimum values can't be that great.Īs for Very Picky I believe that the ASME VIII vessel is not intended for o regulated juristiction.Even though I dont seem to understand the term "local variance" I believe that I can proceed with my estimation. Second, how do you deal with it when the time comes to repair the vessel and the original material isn't available (It is a circumstance, unlikely to happen). I'd stay away from using MTR (Sorry I dont know what MTR stands for) values for a couple of reasons: Your calc's may be used later by someone else who presumes that the MTR value for your vessel is equal to or lower than the MTR UTS for their vessel. ![]() If so, then using the specified minimum UTS divided by 3.5 is not an unreasonable approach to developing a tensile (no tensile-max allowable) design stress. Further, you have no intention to code stamp this vessel (No) - you are only using ASME VIII as a guideline (Correct). I presume you are at least talking about a vessel whose design temperature is ambient (No) and that the "or 2/3 yield" part of the allowable stress basis doesn't apply (We are not performing test at known condition so as to compare information with similar materials) and that compressive stresses do not govern ( I cant understand the meaning of the term "compressive stresses"). Jte to clarify things up I'm adding some remarks on your original post : deanc (Specifier/Regulator) 17 Oct 06 12:05 ![]() Jt RE: Allowable stress for API 5L materials in ASME VIII calculations. The savings for going with MTR values instead of specified minimum values can't be that great. Second, how do you deal with it when the time comes to repair the vessel and the original material isn't available. I'd stay away from using MTR values for a couple of reasons: Your calc's may be used later by someone else who presumes that the MTR value for your vessel is equal to or lower than the MTR UTS for their vessel. If so, then using the specified minimum UTS divided by 3.5 is not an unreasonable approach to developing a tensile design stress. ![]() Further, you have no intention to code stamp this vessel - you are only using ASME VIII as a guideline. I presume you are at least talking about a vessel whose design temperature is ambient and that the "or 2/3 yield" part of the allowable stress basis doesn't apply and that compressive stresses do not govern. How can you already have lowered the calculated thickness of the vessel if you haven't yet figured out the allowable tensile stress? The crucial thing is to obtain the allowable stress value for this material.There is no ASME II part D material index for this pipe so I'll have to estimate one. ![]()
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