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Recent content by Christine74

  1. Christine74

    TEMA DEU/CEU Heat Exchanger - Connection Challenges & Analysis

    Back to the OP, here are some potential issues i see with the original design: 1) The design pressures don't meet the 10/13 rule, so the shell side might not be adequately protected in the event of a tube rupture. Probably best to set the shell side design pressure to at least 77% of the tube...
  2. Christine74

    TEMA DEU/CEU Heat Exchanger - Connection Challenges & Analysis

    Sorry but I have to disagree with all of above responses. Differential thermal expansion isn't going to happen with modern clad plate so that's completely irrelevant. If the original exchanger was a TEMA CEU design you can't just arbitrarily convert it to an NEU as you would lose the ability to...
  3. Christine74

    ELECTRICAL HEATER TECHNICAL SPEC

    Technical specifications for electric process heaters as well as many of the other components you mentioned can be found here: https://www.iogp-jip33.org/wp-content/uploads/2020/12/Specification-Electric-Process-Heaters-S-723v2020-12.pdf https://www.iogp.org/bookstore/product-category/jip33/...
  4. Christine74

    Exclusion From the Scope of ASME BPVC VIII-1 - water-based solution

    I searched ASME's Interpretations database ( https://cstools.asme.org/Interpretation/SearchInterpretation.cfm ) but I couldn't find anything addressing how they define "water". This is something you'll have discuss with your jurisdictional authority and your Authorized Inspector. -Christine
  5. Christine74

    Design liquid velocity recommended by TEMA

    Just to provide the relevant background info selecting the appropriate tube-side velocity is a balancing act of the following considerations: 1) Pressure drop 2) Convective heat transfer 3) Fouling mitigation (higher velocities result in higher shear stress as the fluid interface with the ID of...
  6. Christine74

    Design of floating head ( S type )

    When you say "ID of the channel part" I'm assuming that you're referring to the shell cover. For a TEMA "S" exchanger the diameter of the shell cover has to be a bit larger in order to accommodate the floating head cover and the backing device, which are both necessarily larger in diameter than...
  7. Christine74

    How can such a part be made from steel?

    I think this part would be called a Dished & Internally Flared head. Very similar to a Flanged Only head. I've never seen one before, but there are several manufacturers that make Flanged Only/Dished & (externally) Flared heads in this size/thickness range. -Christine
  8. Christine74

    Vent and Drain ACHE with split headers

    Split header boxes are not intended to operate independently, so you shouldn't need vents and drains on each section. I've never seen that done before. That said, a small amount of fluid wouldn't be able to drain since the elevation of the lowest tube is always a bit higher than the elevation...
  9. Christine74

    SA-182 VS SA-965 for heat exchanger tubesheets and girth flanges

    Forged SA-105 tubesheets are permitted in ASME Section VIII Div. 1 provided that all of the requirements of UG-6(c) are met. "Forgings certified to SA-105, SA-181, SA-182, SA-350, SA-403, and SA-420 may be used as tubesheets and hollow cylindrical forgings for pressure vessel shells that...
  10. Christine74

    SA-182 VS SA-965 for heat exchanger tubesheets and girth flanges

    See UG-6(c). -Christine
  11. Christine74

    ASME Fixed Tubesheet Design Conditions in PV Elite

    r6155 proves once again that he's a brazen liar. Fixed tubesheet calculations are wildly complex. It would take months to write your own spreadsheet to perform these calculations. -Christine
  12. Christine74

    Pressure Vessel Corrosion Allowance

    Refer to nonmandatory Appendix W in ASME Section VIII Div. 1 for guidance on the U-1A. Specifically see item (28) in Table W-3. The thicknesses shown on the U-1 Data Reports have always referred to the Uncorroded condition. -Christine
  13. Christine74

    Repairing S&T HX Channel Pass Plate

    You can ALL CAPS "shout" all you want but the fact that TEMA now has a separate Appendix (and a non-mandatory at that) covering Repairs proves that the TEMA standards were never intended for new equipment. Table RCB-9.131 is not located inside Appendix B so it would not apply to this repair...
  14. Christine74

    Repairing S&T HX Channel Pass Plate

    Please ignore r6155's comments. I suspect that he suffers from Advanced Senile Dementia, which would explain the hostile behavior and the irrelevant citation above. Furthermore he's never demonstrated any knowledge whatsoever of heat exchangers in his previous posts here. TEMA standards are for...
  15. Christine74

    Repairing S&T HX Channel Pass Plate

    TEMA standards are intended for new equipment, not for repairs of existing equipment. -Christine
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