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AutoPIPE Wiki 07. How to model a Pulled Bend and a does AutoPIPE consider the thinning wall on the outer radius of a pulled bend?
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            • -a. Bend & Miter Piping Components - Modeling Approaches, Tips, Techniques used in AutoPIPE
              • 01. How to model an Elbow with Tapered weld joint for Nuclear NB analysis in AutopIPE?
              • 02. How to model a short, long (1.5D), 3D, 5D, or custom bend radius Elbows in AutoPIPE?
              • 03. How to correctly insert Valves, Reducers Or Other Components After Elbow Or After Tee in AutoPIPE?
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              • 07. How to model a Pulled Bend and a does AutoPIPE consider the thinning wall on the outer radius of a pulled bend?
              • 08. How would I model a 120 deg bend 6 ft radius bend in AutoPIPE?
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              • 11. How to specify user stress indices to apply to only one end of a bend in an AutoPIPE model?
              • 12. In AutoPIPE, what SIF is being used in the calculations: Automatic Code calculated SIF, User Defined SIF or other?
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    07. How to model a Pulled Bend and a does AutoPIPE consider the thinning wall on the outer radius of a pulled bend?

    Applies To
    Product(s): AutoPIPE
    Version(s): ALL
    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 Pulled Bend and a does the AutoPIPE consider the thinning wall on the outer radius of a pulled bend?

    Solution:

    A pulled bend is a bend that is formed by a machine wrapping the pipe around a shoe horn form (i.e. like a tubing bender bending tubing) and pulling the pipe against the shoe horn shape.

    One side effect of bending the work-piece is the wall thickness changes; the wall along the inner radius of the tube becomes thicker and the outer wall (extrafit) becomes thinner. AutoPIPE does not consider the different wall thickness. The wall thickness is a uniform value specified on the pipe properties dialog screen.

    Modeling:

    Typically a Pulled bend's dimension for both Radius and Length of legs are larger than a standard forged / welded pipe fitting.  

    Example: model 90 deg Pulled bend with 3D radius and welded directly to butt-welded valve on both sides 2 feet (609.6mm) away.

    Piping Code = ASME NB, NC, or ND:

    Using AutoPIPE Nuclear version, with piping codes ASME NB, NC, or ND, suggest that the proper Bend radius value be entered or selected from the drop down listing (ex. select 3D) and set Bend Type = Pulled (ex. select Pulled).

    insert valve 2 feet (609.6mm) away on both ends.

    Question: Where to insert the Bend Weld Indices? at the valve locations or the Bend Near & Far node points?

    Answer: at the Pulled bend weld locations. In this example, that would be at the valves. 

    Remember that a bend is made up of 4 node points: 1. Near, 2. Far, 3. TIP, 4. Midpoint

    The Bend's Near and Far points  are located based on the tangential distance for the specified radius to fit between intersecting lines. These points just so happens to coincide with standard practice for construction of a bend fitting to industry standards (ex. ASME B16. 9) for Short, Long, and xD bends. However a Pulled bend has legs on both sides that are typically much longer than a normal bend. Therefore, Pulled Bend weld indices should be placed at the actual weld locations, in this example, near the valve. The bend's Near and Far node points would be considered Straight pipe, i.e. no welds. 

    Note: if a USER SIF is placed at a bend's Near or Far node point, the program may list a warning in the Model Consistency Check report.

    Piping Code = Non-nuclear codes

    For other version of AutoPIPE, Standard or Plus (Advanced), using non-nuclear piping codes, to model a pulled bend, select Bend Type = "elbow", SIF and flexibility factor will automatically be calculated but suggest that Bourdon Pressure Effect be turned on (Tools> Model Options> Edit> "Include Bourdon rotational effect" check ON).

    See Also

    Bend & Miter Piping Components - Modeling Approaches

    Bentley AutoPIPE

    • bend
    • AutoPIPE
    • Modeling
    • Pulled Bend
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Mon, Mar 16 2015 6:35 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Fri, Feb 16 2018 11:50 AM
    • Revisions: 9
    • Comments: 0
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