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AutoPIPE Wiki 03. Calculation of fa (allowable expansion stress range) for austenictic steel 1.4301 X5CrNi18-10 is significant difference between hand calculation and AutoPIPE Results, WHY?
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                • 01. Hoop Stress Allowable is 0.00 (zero) for a piping system analyzed in AutoPIPE per En 13480, why?
                • 02. SIF calculations at TEEs are all the same when analyzed per EN13480 -2012 piping code in AutoPIPE, why?
                • 03. Calculation of fa (allowable expansion stress range) for austenictic steel 1.4301 X5CrNi18-10 is significant difference between hand calculation and AutoPIPE Results, WHY?
                • 04. En13480 hoop stress appears to incorrect per code equation in AutoPIPE
                • 05. How to calculate AutoPIPE's En13480 calculation for pressure extension stress
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                • 09. How is the Time Independent Design Stress, f, calculated according to EN 13480-2017 in AutoPIPE for Austenitic Steels (A > 35%)?
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    03. Calculation of fa (allowable expansion stress range) for austenictic steel 1.4301 X5CrNi18-10 is significant difference between hand calculation and AutoPIPE Results, WHY?

    Applies To
    Product(s): AutoPIPE
    Version(s): 2004, XM, V8i 
    Area: calculations  
    Original Author: Bentley Technical Support Group
    Date Logged
    & Current Version
    May 2015
    09.06.02.06

    Problem:

    Comparing the calculation of fa (allowable expansion stress range) for austenictic steel 1.4301 X5CrNi18-10 between hand calculations and AutoPIPE. For room temperature it looks like fc=MAX(Rm/3;f), where as it should be MIN. For higher temperatures we cannot determine the cause.

    please comment.

    Solution:

    Please see the following AutoPIPE help section for calculations used by the program:

    Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> Euro EN 13480> Allowable Stresses 

    For En13480, from AutoPIPE help, know that AutoPIPE assumes Rmt = Rm during the calculation of the cold design stress, and that the application evaluates f accordingly. Furthermore detailed information such as this is available in AutoPIPE help, such as: 

    1. AutoPIPE evaluates the hot allowable based on displacement categories.

    2. AutoPIPE evaluates the allowable stress at minimum temperature, fc. Again, the program assume that Rmt = Rm, so the design stress below is used:

    f' = max (R_p1,0t/1.5,min, (R_mt/3.0, R_p1,0t/1.2) )
    f_c = min(R_m/3.0,f' )

    3. Note, fc is at a constant ambient temperature, independent of the thermal load case.

    4. Confirm hand calculations have the correct Eh and Ec from the results report,. Different values will produce different results between hand calculations and AutoPIPE results.

    5. Note, that some differences between hand calculations and AutoPIPE result values will most likely be floating-point or unit conversion errors, but still within 1% accuracy.

    See Also

    En13480 Piping calculations

    Bentley AutoPIPE

    • En13480
    • Piping Code
    • Austentic
    • fa
    • Expansion Stress
    • allowable stress
    • AutoPIPE
    • Calculation
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Tue, May 19 2015 5:42 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Mon, Apr 27 2020 1:26 PM
    • Revisions: 8
    • Comments: 0
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