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AutoPIPE Wiki 33. How is shell length for heat exchanger determined 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?
            • 40. When deleting a nozzle the heat exchanger baffles are in explicably deleted together when using AutoPIPE Vessel, why?
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     Questions about this article, topic, or product? Click here. 

    33. How is shell length for heat exchanger determined in AutoPIPE Vessel?

    Answer:

    Shell length in the heat exchanger is derived from the tube length value entered in the Bundle tab in Shell and Tube Heat Exchanger Properties dialog box.

    Consider the following example.

    For the BEU type exchanger, the entered value of tube length is 2800 mm

    The value of shell length is kept blank:

     

    The user can specify a value of the shell but it is not necessary as software calculates it. However please make sure that the shell length is consistent.

    The tube length field is mandatory and a value must be entered.

    The length of the tube (2800 mm) is only the length of the straight portion of the tube.

    The length of the shell is calculated by the program by taking into account many parameters as per the following:

    1.The length of the bend portion of the tube, the largest U-Tube centerline is aligned with the tangent line 

    2.The straight length of the tube (2800 mm in this case)

    3.The length of the body flange and flange gasket assembly

    4.The gasket thickness

    5.The tubesheet thickness, and how it is assembled with the flange

    6. The tube extension, as specified in the tubesheet

     

    After factoring all these the length of the shell is calculated as 2876 mm in this case

     

     

    Following is the explanation of the shell length calculations:

    Refer to the 2d sketch generated:

    The calculations of the shell length explained below:

    Obtain the largest bend radius from bend summary in the design report, 342.5 mm in this case:

    As mentioned above the centerline of the tube aligns with the vessel reference tangent line.

    Now refer to the calculations below for shell length:

    To understand how the calculated value of 213 is determined refer to the tube sheet geometry, machined ext. and tube extension, gasket thickness, flange, tubesheet thickness etc.

    The value of 2876.5 matches with the value in geometry list (rounded-off to 2876)

     

    See Also

    Bentley AutoPIPE Vessel

    Bentley Select Services Technical Support webpage:

    the "Comments" area below. THANK YOU!

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    • JamieP Created by Bentley Colleague JamieP
    • When: Mon, Aug 24 2020 12:59 PM
    • JamieP Last revision by Bentley Colleague JamieP
    • When: Mon, Aug 24 2020 1:00 PM
    • Revisions: 2
    • Comments: 0
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