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AutoPIPE Wiki 12. How can I insert the shell connection on the head of a heat exchanger in AutoPIPE Vessel?
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          • -Shell and Tube Heat Exchangers
            • 01. When choosing a 8" nominal shell size the O.D. is reflected as 8.78" O.D. (it should be 8.625").
            • 02. How to import Aspentech edr file into AutoPIPE Vessel?
            • 03. For a shell and tube exchanger with fixed tubesheets, the AutoPIPE Vessel is locked with the "Mechanical cleaning" option even if the option is unchecked?
            • 04. How to manage the baffle spacing of a heat exchanger in AutoPIPE Vessel?
            • 05. How to manage the number of Tubesheets in an AutoPIPE Vessel heat exchanger
            • 06. How to see the pass order number and how to change it in an AutoPIPE Vessel model?
            • 07. Model imported from HTRI suggest tubesheet has 360 tubes, however AutoPIPE Vessel suggest only 332, why?
            • 08. Number of Heat exchanger tubes and path are different in the AutoPIPE Vessel report, why?
            • 09. When changing the material on tubeside, focus of the model changes to a different location in an AutoPIPE Vessel model, why?
            • 10. Why are the ASME 2019 - appendix A-2 calculation for Tubesheet with tubes expanded + seal welded not performed?
            • 11. Why is tubesheet layout not full of tubes?
            • 12. How can I insert the shell connection on the head of a heat exchanger in AutoPIPE Vessel?
            • 13. How to connect two different shell radius (ex. dia #1 =4000 mm, dia #2 = 4220 mm) that have a 50 mm gap between them in AutoPIPE Vessel?
            • 14. How to model customized base plate of a Saddle support for Shell and Tube Heat Exchanger in AutoPIPE Vessel?
            • 15. Use TEMA Metric Bolt Root Area (TEMA Table D-5M) from section 9 in an AutoPIPE Vessel model.
            • 16. Where to input extra cladding thickness on tubesheets in AutoPIPE Vessel?
            • 17. How to Change the the corrosion allowance for clad bottom plate on a heart exchanger model in AutoPIPE Vessel?
            • 18. How do I design a stacked heat exchanger?
            • 19. How does AutoPIPE Vessel set the design conditions for tubesheet?
            • 20. How to define shell length in different types of Heat Exchanger in AutoPIPE Vessel
            • 21. Where do we mention Creep and Fatigue data on Heat exchanger ? We can see tick mark but how about magnitude ?
            • 22. Where do we mention MMT (Mean Metal Temp) in AutoPipe Vessel for Fix tube sheet Heat Exchanger?
            • 23. Heat Exchanger Geometry
            • 24. Heat Exchanger Pass Partition Plate Modification
            • 25. How to manage the baffle spacing of a heat exchanger?
            • 26. Does AutoPIPE Vessel automatically update the tubesheet design conditions when the heat exchanger design conditions are changed?
            • 27. How to use the Tube sheet Design Conditions dialog in AutoPIPE Vessel?
            • 28. What is the difference between tubesheet design condition and design case?
            • 29. While designing a AutoPIPE Vessel heat exchanger tubesheet flange, the "Use EN 13445 Annex G/EN 1591" option is greyed out, why?
            • 30. The definition of the characteristics of the gasket under the pass partition in a heat exchanger is not possible
            • 31. How to model and design heat exchanger with shell dimension based on nominal pipe size?
            • 32. How to specify shell ID instead of tube numbers in modeling the tube layout?
            • 33. How is shell length for heat exchanger determined in AutoPIPE Vessel?
            • 34. How can I input a specific bundle characteristics using AutoPIPE Vessel?
            • 35. How AutoPIPE Vessel calculates the shell length at the time of Heat Exchanger Design ?
            • 36. How is shell length interpreted in AutoPIPE Vessel?
            • 37. Is the corrosion allowance taken into account for the tubes in an ASME design?
            • 38. Why can't I choose a "Double Segmental" baffle type for a BFM heat exchanger which is a common design method for those?
            • 39. What settings to use for DIC and OTL on the harness tab in AutoPIPE Vessel?
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    12. How can I insert the shell connection on the head of a heat exchanger in AutoPIPE Vessel?

    Applies To
    Product(s): AutoPIPE Vessel
    Version(s): V8i 
    Environment: N/A
    Area: Modeling
    Original Author: Bentley Technical Support Group
    Date Logged
    & Current Version
    August 2016
    40.02.00.08

    Problem:

    How can I insert the shell connection  on the head of a heat exchanger in AutoPIPE Vessel?

    Example:

    How can I insert the shell pos. 11 in the head.

    Solution:

    This is a special configuration of heat exchanger for which there is no standard template available in AutoPIPE Vessel. You may model the exchanger in 2 parts:

    Part #1

    Model as a BKU exchanger, this will calculate the shell, channel tubeside, flange, tubesheet etc.

    Part #2:

    Create a pressure vessel model with same shell geometry, shell side design conditions of heat exchanger and insert an offset nozzle on the ellipsoidal head which is assumed as a manhole with a bolted flange cover. This will code check the head (item 02) + nozzle (item 11) configuration. I modeled the nozzle as self reinforced to simulate the geometry and specified the reinforcement height, outward and inward projections etc.

    Another approach, previous mentioned using a manhole nozzle, suggest that instead of a manhole nozzle consider modeling using a regular process nozzle. A manhole nozzle does not accept nozzle local load. However, one can apply the nozzle local load which is equal to the vertical loads and moments exerted from the tubebundle (if it is NOT supported by baffles or maybe some partial load is exerted due to the weight of the bundle at the nozzle flange) to do a more conservative analysis.

    The idea is if the nozzle is seeing any moment or shear load then for a realistic model should consider that load being applied at the nozzle to shell junction and perform a local load analysis based on any of the methods available, which is your choice (eg. WRC, PD5500, EN etc.).

    Consider also performing an FEA analysis if you see the dimensions exceed the applicability of the local load methods.

    Note, 

    1. The approach of FEA and WRC are quite different. Nozzle local load analysis is a complex engineering problem and there is no exact solution. WRC is a closed end approximate solution with limitations of application and FEA is a numerical method and likewise not the exact solution either and the results of WRC may vary from FEA, it is normal. Therefore, the pass/fail depends on what criteria is considered for acceptance.

    2. The above suggested method is just for reference, final design modeling approach is a decision of the designer and must involve sound engineering judgement before making any modeling assumptions.

    See Also

    Modeling techniques for Shell and Tube Heat Exchangers

    Bentley AutoPIPE

    External Links

    Bentley LEARN Server

    Comments or Corrections?

    Bentley's Technical Support Group requests that you please submit any comments you have on this Wiki article to
    the "Comments" area below. THANK YOU!

    • AutoPIPE Vessel
    • heat exchanger
    • Nozzle
    • Modeling
    • FEA
    • shell
    • WRC
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Wed, Aug 31 2016 11:14 AM
    • JamieP Last revision by Bentley Colleague JamieP
    • When: Mon, Aug 24 2020 12:09 PM
    • Revisions: 4
    • Comments: 0
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