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AutoPIPE Wiki 11. How to calculate ASME B31.3 -2010 Occasional stress (Sus+E1) using AutoPIPE?
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                • 00. How to calculate ASME B31.3 2010 Allowables in AutoPIPE?
                • 01. Support loads dues to GR(1) and Gr(2) are different in AutoPIPE model using ASME B31.3, why?
                • 02. why is the computed ASME B31.3 allowable displacement stress range different in my AutoPIPE Model?
                • 03. All the ASME B31.3 SIFs calculated automatically by AutoPIPE are in accordance with the manual calculation except for the bends. Why?
                • 04. Can ASME B31.3 in AutoPIPE V8i 09.06.00.15 perform a fatigue analysis on a piping system due to both thermal and pressure?
                • 05. ASME B31.3-2010 Occ Allowable is incorrect in AutoPIPE V8i 09.04.xx.xx, why?
                • 06. Why are AutoPIPE's code stresses results so different in a model analyzed per ASME B31.3 - 2010 compared to ASME B31.3 - 2012?
                • 07. How are the ASME B31.3 longitudinal pressure stress calculated in AutoPIPE?
                • 08. Does AutoPIPE check branch connection reinforcement area per ASME B31.3, para. 304.3.3?
                • 09. What to enter for the 'Cold Allowable, Min Yield, and Ultimate'. when using ASME B31.3 to model FRP piping in AutoPIPE?
                • 10. Why isn't the Use Appendix P (B31.3) option available for selection in B31.3 edition 2014 of AutoPIPE?
                • 11. How to calculate ASME B31.3 -2010 Occasional stress (Sus+E1) using AutoPIPE?
                • 12. Does AutoPIPE have a setting to switch between using ASME B31.3 eq. 3a or eq. 3b?
                • 13. How is the Ec/Eh ratio applied for ASME B31.1 but not for B31.3 when using AutoPIPE?
                • 14. Does AutoPIPE perform calculations per ASME B31.3 chapter IX and appendix K
                • 15.What causes the difference of Force and Moment in tee section between B31.3 and B31J?
                • 16. How to add a ASME B31E type combination into an ASME B31.3 piping analysis using AutoPIPE
                • 17. Help understanding the changes to the sustained and occasional stresses from ASME B31.1 2018 to 2020?
                • 18. Why stresses are not varying in both Von-Mises & Tresca theory in ASME B31.3?
                • 19. How to calculate the Hoop stress for ASME B31.3-2020?
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    11. How to calculate ASME B31.3 -2010 Occasional stress (Sus+E1) using AutoPIPE?

    Applies To
    Product(s): AutoPIPE
    Version(s): ALL;
    Area:
    Date Logged
    & Current Version
    Oct. 2017
    11.01.00.23

    Problem:

    How to calculate ASME B31.3 -2010 Occasional stress (Sus+E1) using AutoPIPE?

    Solution:

    A common mistake, Do NOT use the reported In-plane moment, Out-plane moment, or Torsional moment from the Occasional load-case (ex. Sus+E1) when calculating the code stresses.  These reported absolute values are the summation of individual load case (Gr) and (E1) from the forces and moments report section:

    Example:

    Instead, start by reviewing the following help section:

    Please see the following AutoPIPE help section:
    Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> ASME B31.3 (2010)> 

    a. Stresses Due to Occasional Loads (ASME B31.3 - 2010)

    b. Stresses Due to Sustained Loads (ASME B31.3 - 2010)

    Notice code stress results for Occasional load case (Sus+E1) are a calculated by adding the stress due to Sustain (Gr+MaxP) and the stresses due to occasional (E1) together.

    A. Stresses Due to Occasional Loads (ASME B31.3 - 2010):

    The stress due to combined sustained and occasional loads (sLO) is calculated in a similar way as per code equation 23a as shown below:

    Where, SL = MAX Stresses due to sustained loads

    Notes:

    1. Sa term may be ignored if all of the following Results options settings are unchecked:

    > Include axial force

    2. Following values are taken from Occasional (E1) Forces and Moments report:

    > Fa
    > Mo
    > Mi
    > Mt

    3. Following values are taken from Code stress report for Occasional load case (Sus+E1):

    > Ii
    > Io

    4. Section Modulus

     

    AutoPIPE reports sLO and the allowable stress (k× SH).

    If the model result option "Use Alt Occ Allow" is checked, the calculated allowable stress will be based on hot yield stress Syt and the material composition for temperatures above Tcr.

    B. Stresses Due to Sustain Loads (ASME B31.3 - 2010):

    For case with pressure extension cases and with Pcase in sustained, the equation to be used for calculating Sustained stress will be given as per code equation 23a (code case 178 in earlier editions):

    Notes:

    1. Sa term may be ignored if all of the following Results options settings are unchecked:

    > Use code case178
    > Include axial force
    > Inc Axial,Pcase in Sus

    2. St term may be ignored if all of the following Results options settings are unchecked:

    > Use code case178
    > Include torsion

    3. Sa term should account for Results option "Long Press (P/A/M/N)" setting:

    Sa = [ Ia * Long Press (P/A/M/N) ] - Sa (above)

    4. Following values are taken from Sustain Forces and Moments report:

    > Fa
    > Mo
    > Mi
    >Mt

    5. Following values are taken from Code stress report for Sustain load case (Gr+MaxP):

    > Ii
    > Io

    AutoPIPE reports sL and the allowable stress (w * SH)., where w = Weld Efficiency Factor for value\

    Question:

    Is there a place in the B31.3-2010 Code where it discusses the lack of applicability of the Ia index for occasional loading?  By virtue of the description of the indeces as being “sustained index”, one might almost conclude that none of the indeces apply for occasional loads?

    Answer:

    As mentioned above, see section ASME B31.3-2010 section 320.2: Stress Due to Sustained Loads. The stress due to combined sustained, and occasional loads (sLO) is calculated in a similar way as per code equation 23a as shown below:

    where:

    sLo = occasional load stress calculated per code equation 23a

    sL = sustained load stress calculated per code equation 23a.

    Sbo = bending stress due to occasional loads

    Sao = axial stress due to occasional loads.

    Sto = stress due to torsional moment due to occasional loads.

    Notice the definitions of Ia and It: 

    In the absence of more applicable data, It is taken as 1.00.

    Therefore AutoPIPE calculations for this code and year will default to 1.00 unless a user defined "Joint type & User SIF" is entered changing the stress indices. 

    See Also

    ASME B31.3 Piping Code Calculation Issues

    Bentley AutoPIPE

    • Code Stress
    • AutoPIPE
    • Calculation
    • ASME B31.3
    • Occasional Load
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Mon, Nov 13 2017 9:58 AM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Thu, Jan 11 2018 4:58 PM
    • Revisions: 10
    • Comments: 0
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