Applies To
Product(s):	AutoPIPE
Version(s):	ALL;
Area:	Calculations
Date Logged & Current Version	June 2022 12.08.00.063

Problem:

How to calculate ASME B31.3 2010 Allowables in AutoPIPE?

Solution:

ASME B31.3 – 2010 Sustained Allowable

W = Cir Weld W factor, located on the User Weld Efficiency Factor dialog.

SH = Hot allowable stress, located on Operating Temperature and Pressure dialog.

ASME B31.3 – 2010 Occasional Allowable

k = K factor, located on Tools> Combinations> “Code Comb” tab (B31.3 Paragraph 104.8.2)

SH = Hot allowable stress, located on Operating Temperature and Pressure dialog.

ASME B31.3 – 2010 Expansion Allowable

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.

SH = Hot allowable stress, located on Operating Temperature and Pressure dialog.

SE = maximum allowable stress,              

Ej = Weld Efficiency Factor, located in the Pipe Properties dialog.

Note: 

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.

Example:

ASME B31.3: 2010            SA = f(1.25Sc + ((0.25Sh)+(Shsus – SLsus)))  

See Also

ASME B31.3 Piping Code Calculation Issues

Bentley AutoPIPE