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AutoPIPE Wiki 06. How to set HOOP Stress allowable for both Operating or Design Pressure in AutoPIPE?
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                  • 06. How to set HOOP Stress allowable for both Operating or Design Pressure in AutoPIPE?
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    06. How to set HOOP Stress allowable for both Operating or Design Pressure in AutoPIPE?

    Applies To
    Product(s): AutoPIPE
    Version(s): ALL;
    Area: Results
    Date Logged
    & Current Version
    April. 2018
    11.03.00.08

    Problem:

    How to set HOOP Stress allowable for both Operating or Design Pressure in AutoPIPE?

    Design Code = ASME B31.1 - 2014

    Operating case: Temp 1 = 100 deg F,  Press 1 = 100 psi

    Design case:      Temp 2 = 999 deg F,  Press 1 = 999 psi

    How to set up the Hoop stress combination to calculate the correct hoop stress allowable for the respective temperature?

    Solution:

    According to AutoPIPE help for ASME B31.1 - 2014, the hoop allowable is set to WxSE, 

    If more than one operating load condition exists there may be more than one P and SE value (since SE is dependent on the temperature defined in the corresponding thermal load case). Results are output for the operating load condition which produces the smallest margin (i.e., smallest value of W.SE -shoop) at each point

    Additional AutoPIPE help notes mention:

    1. By default, the program considers the maximum pressure from all cases and the minimum Sh from all cases. To evaluate one case only, define the specific P case in the MaxP code combination e.g. "MaxP" = (hoop)  + P2

    Therefore, create 2 new user combinations as follows:

    Look at the Code Stress Report for these hoop stress combinations to confirm that the Allowable has been set correctly:

    MaxP (Maximum) Allowable = 9000 psi

    Hoop-P1 (Operating case):  Allowable = 13700 psi

    Hoop-P2 (Design case):      Allowable = 9000 psi

    See Also

    Bentley AutoPIPE

    • AutoPIPE
    • allowable
    • COMBINATION
    • Hoop
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Fri, Jun 22 2018 5:42 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Fri, Jun 22 2018 5:43 PM
    • Revisions: 3
    • Comments: 0
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