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AutoPIPE Wiki 19. How does AutoPIPE Vessel set the design conditions for tubesheet?
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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?
            • 41. Why effective diameter formula is different in operating and hydrotest condition (tube side) compared to hydrotest condition shell side?
            • 42. Tube Bundle report is not aligned with bundle layout
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    19. How does AutoPIPE Vessel set the design conditions for tubesheet?

    Answer:

    The tubesheet design conditions are set as default in Autopipe Vessel based on MAWP which may be higher than the design pressure.

    Eg. observe in the image below:

    In the Design Conditions tab, both for Shellside and Tubeside pressure, the MAWP is considered.

    However, observe in the report that for tubeside MAWP = design pressure = 1.8 MPa, however, in the shellside, the MAWP=1.79 MPa which is higher than 1.6 MPa.

    The user can replace the MAWP values in the design conditions tab by manually selecting the design pressure by double clicking on the MAWP in the grid and selecting from the dropdown as shown below:

    After changing the shell side pressure condition to design pressure from MAWP, run the report and you would observe that the tubesheet design is now based not on MAWP but the design pressure (1.6 MPa):

    Note:  When the designer doesn’t know the maximum allowable pressure, then the program is able to determine the maximum permissible pressure. By default, this maximum permissible pressure is used as the maximum allowable pressure. But if the designer knows the maximum allowable pressure then they can input this value and the program will use this value to determine the test pressure.

    • design pressure
    • tubesheet design conditions
    • MAWP
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    • Sudip Ganguly Created by Bentley Colleague Sudip Ganguly
    • When: Mon, Aug 10 2015 3:50 PM
    • JamieP Last revision by Bentley Colleague JamieP
    • When: Mon, Aug 24 2020 12:33 PM
    • Revisions: 6
    • Comments: 0
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