Dear all
I have encountered a problem. please go through this
As we know: Allowable stress range for expansion case:
Sa = f(1.25*Sc + 0.25*Sh) [For Power Piping ASME B31.1]
Now, particularly for SA335 P91 material there is a mismatch in the value of 'Allowable stress range' calculated by the above mentioned formula and CAESAR II 5.2.
For eg. At T=510 deg.c Sc=16753.877 N/cm2;Sh= 12273.749 N/cm2, f=1
As per formula Sa= 24010.78 N/Cm2
As per CAESAR II 5.2 Sa= 20304.9 N/Cm2
This mismatch happens with SA335 P91 material [ASME B31.1], irrespective of the temperature. Please suggest.