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AutoPIPE Wiki 10. How to model a Socket welded or threaded fittings (i.e. Bend, Tee, valve, Sockolet, Threadolet, etc..) in AutoPIPE?
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              • 10. How to model a Socket welded or threaded fittings (i.e. Bend, Tee, valve, Sockolet, Threadolet, etc..) in AutoPIPE?
              • 11. How to specify user stress indices to apply to only one end of a bend in an AutoPIPE model?
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    10. How to model a Socket welded or threaded fittings (i.e. Bend, Tee, valve, Sockolet, Threadolet, etc..) in AutoPIPE?

    Applies To
    Product(s): AutoPIPE
    Version(s): 2004, XM, V8i 
    Environment: N/A
    Area: Modeling
    Original Author: Bentley Technical Support Group
    Date Logged
    & Current Version
    Mar. 2015
    09.06.01.10

    Problem:

    How to model a Socket welded or threaded fittings (i.e. Bend, Tee, valve, Sockolet, Threadolet, etc..) in AutoPIPE?

    Solution:

    Apply manufacture recommended SIF values or refer to a specific piping code for recommended SIF values to be applied piping component

    Threaded fittings:

    The intent on many ASME codes  to use conservatively an SIF value = 2.3

    Socket Welded fittings:

    The intent on many ASME codes  to use conservatively an SIF value = 2.1

    ASME Codes state the following regarding socket welds:

    B31.1 use 1.3 for socket welds with no undercut, and 2.1 for all others.

    B31.3 states "2.1 Max or 2.1 T/Cx but not less than 1.3. Cx is the fillet weld leg length"

    B31.8 states "2.1 Max or 2.1 T/Cx but not less than 1.3. "

    Apply an SIF to all bends and Tees:

        1. Press Select> Bends> to highlight all bends in the model,

        2. Press Select> Tees> to highlight all tee in the model

        3. Press Insert> Xtra data> Joint Type and User SIF> select "Joint End Type" =  (select 1 of 10 choices) (ex. "Socket or Fillet Weld ", " Threaded Joint")
          Note:
             1. see AutoPIPE help for a complete list of options available for selection.
             2. For joint types not listed select "User-Defined"
                 
          Manually enter the "Inplane SIF" = (manufacture / code recommended value, ex. 2.1)
                 M
          anually enter the "Outplane SIF" = (manufacture / code recommended value, ex. 2.1)

        4. Optional: select "Override all other SIFs at this point", see AutoPIPE help for details on this option.

        5. Press OK button to apply SIF values to all highlight components.

    Account for the extra weight of a 2000# to 9000# fitting:

        1. Create a new pipe property with the correct wall thickness

        2. Press Select> Bends> to highlight all bends in the model

        3. Press Select> Tees> to highlight all tee in the model,

        4. Press Modify> "Pipe Properties over range", select the new pipe property ID, and press OK button to assign the new pipe ID to the selected components.

    To account for Threaded / Grove reduced wall thickness in Hoop calculation 

    As an example, according to ASME B31.3 - 2014 sec. 320.1, Basic Assumptions and Requirements Sustained conditions may be evaluated by detailed analysis, approximate methods, or simplified means such as span tables.

    Section moduli used to compute the stresses in this paragraph shall be based on nominal pipe dimensions less allowances, i.e., the sum of mechanical (thread or groove depth), internal and external corrosion, and erosion allowances. 

    The code continues with formula that include the SIF's

    Again as an example, in AutoPIPE , using ASME B31.3-2014, section modulus is calculated using the nominal thickness less corrosion allowance if "Use Nominal Thickness" is unchecked. Pipe Property "Mill tolerance" is not considered ever for B31.3 section modulus calculations. 

    Therefore, when applying an user SIF, by setting "Joint End Type  = Threaded Joint" will affect only the SIF and not the section modulus, 

    Adding the corrosion and thread / grove depth together, placing that value in the corrosion field of the Pipe Properties dialog should calculate the appropriate section modulus for all pipes using that Pipe ID.

    See Also

    Bend & Miter Piping Components - Modeling Approaches, Tips, Techniques

    Bentley AutoPIPE

    • Socket
    • bend
    • Threaded
    • AutoPIPE
    • Modeling
    • fittings
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Mon, Mar 16 2015 6:45 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Wed, May 20 2020 7:12 PM
    • Revisions: 5
    • Comments: 0
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