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  1. MchA

    TEMA DEU/CEU Heat Exchanger - Connection Challenges & Analysis

    Thank you r6155 for your advising. Regarding stud bolts in blind threaded holes, I understand ASME VIII clearly defines them, and Appendix 2 in VIII-1 provides calculation methods. However, my question is about their applicability to tubesheets under VIII-2. The software I use doesn’t consider...
  2. MchA

    TEMA DEU/CEU Heat Exchanger - Connection Challenges & Analysis

    Thank you all for your valuable replies and insights. FV both on shell side and tube side in the original project. The redesign of the flange — now incorporating 2½" bolts — will increase both the flange thickness and outer diameter, which could lead to interference with the shell-side outlet...
  3. MchA

    TEMA DEU/CEU Heat Exchanger - Connection Challenges & Analysis

    Hello Everyone, I am currently designing a TEMA type DEU (or CEU) Heat Exchanger and am encountering some challenges, particularly regarding the simulation of the shell-to-tubesheet connection. Below are the key design conditions for the heat exchanger: Design Code: ASME VIII-1 Ed. 2023...
  4. MchA

    Forming Strains under ASME VIII-1 vs ASME VIII-2

    Thank you all for your kind replies, I fully agree with this when referring to Table UG-79-1. However, I still have some doubts regarding the first row of Table 6.1 for one-piece heads, because in this case, the forming strain appears to be defined by the following parameters: Db = diameter...
  5. MchA

    Forming Strains under ASME VIII-1 vs ASME VIII-2

    Thank you so much, TGS4 and r6155. I now understand that the classification in ASME VIII-2 Table 6.1 is based strictly on the "fabrication method", rather than geometric or strain-related considerations. That said, I still find this a bit counterintuitive from an engineering standpoint. A...
  6. MchA

    Forming Strains under ASME VIII-1 vs ASME VIII-2

    Hello everyone, I am seeking clarification on the classification of forming strains under ASME VIII-1 UG-79 and ASME VIII-2 Table 6.1, particularly for spherical caps, such as those used in floating head heat exchangers or intermediate heads with Y-forgings. Under ASME VIII-1 Table UG-79-1...
  7. MchA

    Corner Joint Efficiency - UW-12

    Thank you so much Trestala! This is the flange with split ring, ring joint and tubesheet. In this case the RT can be done on the flange welding, but in the rear closure, as shown before, we would have a corner joint so no RT can be done. Thank you, David. I noticed Note 8 in Table UW-12, but...
  8. MchA

    Corner Joint Efficiency - UW-12

    Thank you, R6155. This is the sketch. The weld I am referring to is the one connecting the shell nozzle to the flat cover on the right side Thank you, Trestala! I now understand that I have a Category C joint, which is not required to be radiographed because there is no intersection with a...
  9. MchA

    Corner Joint Efficiency - UW-12

    Dear all, I am currently designing a hairpin heat exchanger under ASME VIII-1 Ed. 2023 with the following design conditions: Corrosion Allowance: 1.6 mm Shell Side Pressure: 10 barg, Temperature: 280°C Tube Side Pressure: 93 barg, Temperature: 280°C Joint Efficiency Required by Client: FULL...
  10. MchA

    UCS-66 / ASME SA-516 Gr.70 Fine Graine Practice

    Hello everyone, I would like to ask you for confirmation on a particular comment reported to us for UCS-66 - impact test requirements, specifically regarding the ASME SA-516 gr.70 fine-grained material produced and normalized. Considering the ASME II Ed.2023, there is the note: "The steel...
  11. MchA

    Impact Test Requirement UCS-66 for ASME SA-387 Gr.11

    Thank you GD for your answer, I just shown an imagine where spit ring (back ring) had a generic indication. Our floating flange will not be absolutely that. Thank you so much! From Fig.UG-84.1 (c) Material produced and impact tested in accordance with SA-320, SA-333, SA-334, SA-350, SA-352...
  12. MchA

    Difference between ASME SA187 Gr.5 and ASME SA336 Gr.5

    Thank you all for your responses, I apologize, it was definitely a typo and I meant SA-182 Gr.5, both in the title and in the first post. I asked because we usually order main flanges with specific dimensions in ASME SA-336 (and tube sheets) where, specifically, tube sheets receive machining...
  13. MchA

    ASME SA-350 & ASME SA-765 - standard product and specific dimensions

    Thanks for the answer GD, I'm sorry I forgot to mention the design code: ASME VIII Div.1 Edition 2023 I am designing an heat exchanger but my question is much more generic, I mean, these materials apply both to heat exchangers but also to vessels, considering standard flanges or flanges with...
  14. MchA

    ASME SA-350 & ASME SA-765 - standard product and specific dimensions

    Hello All, I'd want to show a doubt that comes for standard forgings and large forgings, in particular regarding carbon steel at hight temperature and low temperature. Considering the ASME SA-350, that specification covers carbon and low alloy steel forgings, requiring notch and toughness...
  15. MchA

    Impact Test Requirement UCS-66 for ASME SA-387 Gr.11

    Regarding the Impact test, I have a doubt about the governing thickness reported in Fig. UCS-66.3. Considering the following images, our software considers the following governing thickness of the floating flanges: - Slit ring divided for 4, - Floating flange: dimension B divided for 4 -...
  16. MchA

    Increase Design Pressure Tube Side for External FV

    Thank you so much all! The inspector wanted exactly to increase the tube side pressure to 7.9 (design pressure + FV shell side), I've revised the design and effectively, as all of you suggested, that is a combination case that I should have considered before. Thank you so much another time.
  17. MchA

    Impact Test Requirement UCS-66 for ASME SA-387 Gr.11

    Thanks GD2 for your answer, "I don't understand when you say I ahve forgings with MDMT -32C." I'm sorry I haven't explained myself appropriately, I made an exemplation, so in my case using fig.UG-66 (tube side) I obtain, for that thickness and for forgings in ASME SA-336 Gr.11, a MDMT of -32 [°C].
  18. MchA

    Increase Design Pressure Tube Side for External FV

    Hello all I'd like to ask you one particular point that the NoBo pointed out in a design of an hairpin heat exchanger, defined by the following data: Calculation Code: ASME VIII Div.1 Edition 2023 Design Pressure SS/TS [barg]: 6.7 + FV / 6.9 Design Temperature [°C]: 111 / 111 Materials: Carbon...
  19. MchA

    Difference between ASME SA187 Gr.5 and ASME SA336 Gr.5

    Thank you geesaman for your answer, Definitely they are very similar but not identical, but considering che chemical composition and the heat Treatment in the production process (SA-366 shall be annealed or normalized and tempered and SA-182 annealed or normalized and tempered) is that...
  20. MchA

    Difference between ASME SA187 Gr.5 and ASME SA336 Gr.5

    Hello All, Considering the forging ASME SA-187 Gr.5 and ASME SA-336 Gr.5, I have noticed that, in ASME II Part D they are caracterized by different values on Maximum Allowable stresses, altrough I haven't found any reference about the reason why difference is shown, especially considering the...

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