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AutoPIPE Wiki 01. After changing the piping code edition from ASME B31.1 2010 to 2012 in AutoPIPE, the results are different, why?
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            • -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?
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    01. After changing the piping code edition from ASME B31.1 2010 to 2012 in AutoPIPE, the results are different, why?

    Applies To
    Product(s): AutoPIPE
    Area: Piping Code
    Original Author: Bentley Technical Support Group
    Date Logged
    & Current Version
    June 2015
    09.06.02.06

    Problem:

    After changing the piping code edition from ASME B31.1 2010 to 2012 in AutoPIPE, the results are different, why?

    Solution:

    1. B31.1 2010 library has different modulus values as compared to B31.1 2012 library, for example compare the pipe material library data from both library files ( B311-10 & B311-12) for CS. 

    This will account for some of the differences observed by the user.

    2. Review the Temp / Press/ PipeID tab to be sure that the expansion and modulus values in the model are correct.

    3. The ASME B31.1 -2012 code has different material values than listed in the 2010 edition. These changes would effect multiple pipe properties, ex. long, hoop and shear modulus, in the program.

    4. In some rare cases (where no consistent steps have been documented in order to repeat), the model data was found to be different when compared to the program's library files. This would cause a significant change in the code compliance calculations. One way to be sure the model has the correct library values is to essentially reset the Library data by using the following procedure:

    Under Tool> model Options> General> change the ambient temp from the original setting to a different one, press OK button a few times, and then go back to the same location to change it back to the original value.

    This action will cause the program to reload all the material library data used in the model or refresh the data.

    Warning: after resetting the library data as described above be sure to validate the Tools> Model Options> Edit and Results settings are correct.

    See Also

    ASME B31.1 Piping Code

    Bentley AutoPIPE

    • B31.1
    • Piping Code
    • AutoPIPE
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Mon, Jun 29 2015 1:52 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Tue, Jun 2 2020 9:34 AM
    • Revisions: 2
    • Comments: 0
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