How to calculate ASME B31.3 2010 Allowables in AutoPIPE?
W = Cir Weld W factor, located on the User Weld Efficiency Factor dialog.
SH = Hot allowable stress, located on Operating Temperature and Pressure dialog.
k = K factor, located on Tools> Combinations> “Code Comb” tab (B31.3 Paragraph 104.8.2)
f = the range reduction factor, located in the Pipe Properties dialog
SA = expansion allowable stress. Tools> Model Options> Results> Sustain Margin (Y/N/E)
Sustain Margin = Y,
Sustain Margin = N, Note: SL = SH
Sustain Margin = E, add the sustain load margin to the expansion allowable stress only when the calculated expansion stress exceeds the expansion allowable stress without the sustain load margin
SC = Cold Allowable stress, located on Pipe Properties dialog.
SE = maximum allowable stress,
Ej = Weld Efficiency Factor, located in the Pipe Properties dialog.
AutoPIPE uses the expansion Allowable Stress Range calculation equation 1A. However, whenever accounting for sustain load margin. Both Sh and Sl are taken from the Sustain stress results. Another words, equation 1B is not used in AutoPIPE, use equation 1A with the requirements as mentioned in the paragraph between equation 1A and 1B.
ASME B31.3: 2010 SA = f(1.25Sc + ((0.25Sh)+(Shsus – SLsus)))
ASME B31.3 Piping Code Calculation Issues