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Prex, Ok forget secondary stresses but you say to check local membrane stresses PL, The allowable stress will be?(nozzle/shell transition area) Thank all

Thank TGS4, According to what you are saying once the loads according to Table 5.3 are checked and verified no extra analysis is necessary, even if the test pressure is higher than the one according to ASME that is my case? Clear that in the code there is not any stress limits (except general...

According to Asme VIII div.2 Tab. 5.6 (ed.2010) the stresses in the shell near nozzle or other opening due to internal pressure are PL,Q anf F. On the same table on the nozzle within the limits of reinforcement given by paragraph 4.5 the stresses due to internal pressure are general membrane Pm...

that is the point, nowhere is mentioned that it is mandatory!

brkmech1234 thank for your reply only one remark, where is state in the code that the check (hydrotests with 90% yield) is mandatory?

Sorry if it was not clear, i try it with an example. 1) Pd=50 bar 1.3xPdxStest/Sdes=65 bar=Ptest MAWP of the vessel=53 bar MAP=55bar Is the vessel safe at P=Ptest? If yes shall I prove that and how? 2) Now the test pressure is according to PED Ptest=1.43Pd=71.5 bar Same question as above

Gent, general question about test pressure according to ASME VIII div 1, Hydrostatic pressure=1.3xPdxStest/Sdes (UG-99(b)) Static pressure can be neglect (very low) Assume MAWP=Pd Min. MAWP calculated < Hydrostatic pressure Min. MAP calculated < Hydrostatic pressure also In this case do I need...

I have question for you gents: I’m checking a stress calculation from our vendor (vertical reactor) performed with FEM. The loads are: weight, pressure and thermal,no cycle loads. At a certain point he calculate PL+PB+Q+F=562MPa ( connection between the head and nozzle) larger then allowable...

According to ASME PCC-1 you have to check all components of your joint and this imply some not simple calculations, of course you need some data from the gasket maker but this is not enough: (d) The maximum permissible bolt stress for the flange (Sfmax) must be determined, based on the...

Sorry gent. but my concern about the flange is sill there! thank you anyway

Thank you for your reply TGS4. You say that i have to focus more on leakage of the joint than the stress of the flange and in principle i’m agree with you but anyway you have to set a preload value for your bolts or not? According to appendix S is clear that a higher value of the stress in the...

I have a question regarding bolts preload: I calculated a flange according to appendix 2 of Asme VIII div.1, and now i have to define the max preload bolts to assemble the joint, i saw several calculations where is showed a pre stress of the bolts of 50% of the allowable stress.(this value is...