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AutoPIPE Wiki 12. What is the hot load on a spring hanger in AutoPIPE?
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            • 00. How to perform a spring hanger analysis in AutoPIPE?
            • 01. What load cases are use to select a spring hanger in AutoPIPE?
            • 02. How to force Spring Hanger selection to always select a spring instead of a rigid support in AutoPIPE?
            • 03. Hanger design - do we attach a sign to the cold load ie. - or + In AutoPIPE?
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            • 05. What is AutoPIPE doing when a spring hanger is set for undesigned and ONLY Static analysis is performed.
            • 06. Why is that there is a big discrepancy between the AutoPIPE Hanger Analysis calculated values and the values that are actually on the spring cans that have been in service for many years.
            • 07. Why is that there is a big discrepancy between the AutoPIPE Hanger Analysis reported values and the Static Analysis results ?
            • 08. Why are restraint reactions different after disabling some Spring hangers support "Undesigned " option in AutoPIPE?
            • 09. How to print Spring Hanger Selection report in AutoPIPE?
            • 10. How to consider cut short when performing a Spring Hanger Selection in AutoPIPE?
            • 11. Can load variation be set to a different value, why does AutoPIPE default to 25% in spring hanger selection?
            • 12. What is the hot load on a spring hanger in AutoPIPE?
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     Questions about this article, topic, or product? Click here. 

    12. What is the hot load on a spring hanger in AutoPIPE?

    Applies To
    Product(s): AutoPIPE
    Version(s): ALL;
    Environment: N/A
    Area: Modeling
    Original Author: Bentley Technical Support Group
    Date Logged
    & Current Version
    Aug. 2017
    11.01.00.17

    Problem:

    What is the hot load on a spring hanger in AutoPIPE?

    Solution:

    Please see the following AutoPIPE help section:

    Help > Contents> Contents Tab> Reference Information> Hanger Selection Procedure> Hot Load Design Hanger Selection Procedure

    This information will explain how AutoPIPE chooses a spring from the specified manufacture or why AutoPIPE changes the variable spring support to a Constant Spring or Rigid support.

    As mentioned in the procedure the Hot Load in this case would be calculated by:

    A rigid restraint (V-stop) replaces the hanger for the gravity (GR) load case. The calculated support reaction is the hot load to be carried by the hanger.

    Then the maximum displacement is calculated from thermal movement. Knowing the displacement and Hot load  refer to the Spring hanger manufacture literature to interpolate the theoretical cold load on the spring. Enter the Cold load and spring rate into AutoPIPE's Undesigned spring hanger, and run analysis. 

    Example:

    GrT1P1 = analyzed Cold load on the spring hanger

    GrT2P2 = analyzed Hot load on the spring hanger

    Conclusion

    From the spring hanger report we see the analyzed Hot Load and the interpolated Cold Load. The Spring Rate and interpolated Cold Load are using in AutoPIPE's analysis to calculate the actual analyzed cold operating condition (GrT1P1) and hot operating condition (GrT2P2). Notice that the hot load is lighter than the cold cold, this is because in this example, thermal case T2 caused the spring hanger location to rise up, putting less of a load on the spring hanger. 

    See Also

    Spring Hanger Selection

    Bentley AutoPIPE

    • Hot Load
    • AutoPIPE
    • Spring Hanger Selection
    • Cold Load
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Mon, Aug 28 2017 11:16 AM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Thu, May 9 2019 12:05 PM
    • Revisions: 3
    • Comments: 0
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