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AutoPIPE Wiki 07. How does the program calculate ASME B31.1 allowable values in AutoPIPE?
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            • 01. What piping codes are available in AutoPIPE?
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              • +- General FAQ's about Piping Code Calculations
              • -ASME B31.1 Piping Code Calculation Issues
                • 01. After changing the piping code edition from ASME B31.1 2010 to 2012 in AutoPIPE, the results are different, why?
                • 02. With ASME B31.1 piping code, which equation does the program uses for thermal stress in AutoPIPE?
                • 03. What is the correct method to apply the option of analyzing SAM load case moments in Eq 13 instead of Eq. 12 in the code using ASME B31.1 piping code in AutoPIPE.
                • 04. ASME B31.1 reference equation numbers seem to be wrong in AutoPIPE Reports.
                • 05. When comparing the hand calculated hoop stress results with that calculated by AutoPIPE they are different, why?
                • 06. What value of Bend radius is AutoPIPE using when calculating the SIF of a 3/4" NPS, when radius = short, Long, 3D, and 5D ?
                • 07. How does the program calculate ASME B31.1 allowable values in AutoPIPE?
                • 08. How does AutoPIPE calculate ASME B31.1 Hoop stress?
                • 08. Why is AutoPIPE automatically using ASME B31.J for SIF and flexibility calculations in ASME B31.1 2020?
                • 09. What is the significance of Bending stresses in ASME B31.1 2018?
              • ASME B31.11 Slurry piping code Calculation Issues
              • +ASME B31.12 Hydrogen Pipelines and Hydrogen Industrial Piping
              • +ASME B31.3 Piping Code Calculation Issues in AutoPIPE
              • +ASME B31.4 Chapter IX (Offshore) Piping Code Calculation Issues in AutoPIPE
              • +ASME B31.4 Piping Code Calculation Issues
              • +ASME B31.8 Piping Code Calculation Issues
              • +ASME B31J Code Calculation Issues
              • +ASME BPV-III-1-NB, AutoPIPE Nuclear Piping Code FAQ
              • +ASME BPV-III-1-NC, AutoPIPE Nuclear Piping Code FAQ
              • +ASME BPV-III-1-ND, AutoPIPE Nuclear Piping Code FAQ
              • +BS7159 Piping Code Calculation Issues in AutoPIPE
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              • +HDPE CC N-755-1 Piping Code Calculation Issues in AutoPIPE
              • +ISO 14692 code calculations in AutoPIPE
              • +JSME S NC1-PPC Piping Code Calcualtion Issues
              • KHK Level 2 Piping Code Calculation Issues
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    07. How does the program calculate ASME B31.1 allowable values in AutoPIPE?

    Applies To
    Product(s): AutoPIPE
    Version(s): 2004, XM, V8i, CONNECT;
    Area: Calculation
    Original Author: Bentley Technical Support Group
    Date Logged
    & Current Version
    May. 2016
    10.01.00.09

    Problem:

    How does the program calculate ASME B31.1 allowable values in AutoPIPE?

    Solution:

     Open AutoPIPE, see the following AutoPIPE help section: 

    Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> ASME B31.1> select  a code year, see the various topics, 

    Read the entire entry. Somewhere in the write-up will be information about how AutoPIPE calculates the various allowable values for the output report. 

    Note: there are some settings under Tools> Model Options> Results that may affect the Allowable value, confirm these values and take them into consideration when calculating the allowable(s).

    Allowable Stress (ASME B31.1 - 2010)

    Hoop Allowable

    Equation/Nomenclature

    Location in AutoPIPE

    σ = W∙SE; SE = Ej∙SH

    Code Calculation

    W = Weld Joint Strength W factor

    Insert/Modify > Pipe Properties

    Ej = Weld Efficiency Factor

    Tools > Model Options > Results

    SH = Hot Allowable Stress

    Insert/Modify > Operating Temperature and Pressure

    Occasional Allowable

    Equation / Nomenclature

    Location in AutoPIPE

    σ = k∙SH

    Code Calculation

    k = k-factor

    Tools > Combinations > “Code Comb.” tab

    SH = Hot allowable stress

    Insert/Modify > Operating Temperature and Pressure

    Sustained Allowable

    Equation / Nomenclature

    Location in AutoPIPE

    σ = SH

    Code Calculation

    SH = Hot allowable stress

    Insert/Modify > Operating Temperature and Pressure

    Thermal Expansion Allowable

    Equation / Nomenclature

    Location in AutoPIPE

    if SA > SE

    σ = Sa

    If SE> SA and SH> SL 

    σ = SA  + f (SH - SL)

    Code Calculation

    f  = Range reduction factor

    Insert/Modify > Pipe Properties

    SA = expansion allowable stress. 

    Tools> Model Options> Results> Sustain Margin (Y/N/E)

    if Sustain Margin = Y > SA = f(1.25SC+0.25SH)+f(SH-SL)

    if Sustain Margin = N > SA =f(SC+0.25SH) 

    if Sustain Margin = E> SA= f (SC+0.25SH) 

    unless σ > SA, otherwise SA=f(1.25SC+0.25SH)+f(SH-SL)

    f = Range Reduction Factor

    Insert/Modify > Pipe Properties

    SC = Cold Allowable Stress

    Insert/Modify > Pipe Properties

    SH = Hot Allowable Stress

    Insert/Modify > Operating Temperature and Pressure

    SL = Sustained Load

    Taken from Sustained Load calculation

    See Also

    ASME B31.1 Piping Code Calculation Issues

    Bentley AutoPIPE

    • B31.1
    • allowable stress
    • AutoPIPE
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    • History
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Mon, May 16 2016 11:46 AM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Wed, Oct 24 2018 11:37 AM
    • Revisions: 8
    • Comments: 0
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