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AutoPIPE Wiki 04. Difference between a HLP and a CLP with Spring Hanger selection 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?
            • 04. Difference between a HLP and a CLP with Spring Hanger selection in AutoPIPE?
            • 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. 

    04. Difference between a HLP and a CLP with Spring Hanger selection in AutoPIPE?

    Applies To
    Product(s): AutoPIPE,
    Version(s): ALL
    Environment: N/A
    Area: Hanger Selection
    Original Author: Bentley Technical Support Group

    Problem:

    I thought I fully understood the difference between using the hot load procedure (HLP) and the cold load procedure (CLP) to size a spring hanger, but I guess I was wrong. I have tried running the "WALKTHRU" sample using both the HLP & the CLP, which should give me the same spring size, given the same thermal deflection and GR load from my V-stop run. I end up with two different spring sizes, which has to be incorrect.

    Solution:

    No, each procedure is fundamentally different when sizing a spring and therefore the spring size and cold load will be different.

    As mentioned in the online help:

    A. Hot Load Design Hanger Selection Procedure: 

    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.

    B. Cold Load Design Hanger Selection Procedure

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

    Example: GR load on the support Dy = -1975 lbs, and T1 movement, Dy = +0.204".

    Per the Cold Load method, the Hot Load is interpolated  to be 1836.6 lbs as shown below:

     

     Per the Hot Load method, the Cold Load is interpolated  to be 2158.2 lbs as shown below:

    Note: In the cold load procedure above the Cold Preload for all springs was 1975.0 lbs, however here in the Hot Load procedure, all the Hot load values are 1975.0 lbs.

    .  

    Again, totally different springs are selected when using the different hanger selection procedures. 

    See Also

    Spring Hanger Selection - AutoPIPE

    Bentley AutoPIPE

    • AutoPIPE
    • Spring Hanger Selection
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Mon, Dec 8 2014 12:04 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Fri, Aug 18 2017 11:25 AM
    • Revisions: 6
    • Comments: 0
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