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  1. LY.Yan

    Appendix 2 Figure 2-4(11) integral

    Dear r6155, Thank you! LY
  2. LY.Yan

    Appendix 2 Figure 2-4(11) integral

    Dear all, from the above i understand that a back gouging is not required. i am able to use 1st TIG for sketch (n) weld and it will be full penetration integral weld. My understanding is correct?
  3. LY.Yan

    Appendix 2 Figure 2-4(11) integral

    Good day to All, For Asme section VIII div1, can the attached sketch be considered full penetration for integral flange calculation in appendix 2 figure 2-4(11)? if it is a no for the above question, can i gather that For figure 2-4(11) it should be calculated as a loose flange always...
  4. LY.Yan

    Rectangular vessel Hydrotest condition >1.3*DP*LSR

    Good day, Thank you!
  5. LY.Yan

    Rectangular vessel Hydrotest condition >1.3*DP*LSR

    Good day to all, For rectangular vessel(Header box), I am aware that one should apply Appendix 13 as per ASME code. However if my hydrotest value is higher than 1.3*design pressure* LSR, how do I validate that the vessel strength is acceptable at the higher pressure theoretically. For...
  6. LY.Yan

    Appendix A tube to tube-sheet joint Lmax and L

    Good day everyone, for ASME appendix 13 tube to tube-sheet joint, when it is not possible to obtain full strength weld due insufficient space for welding(at least this is what I am told), the other way I can verify the tube joint is through appendix A? I manage to get Pe,Po and Lmax value...
  7. LY.Yan

    Different thickness for Appendix 2 Flg and Shell

    Good Day to all, For Section VIII Appendix 2 Figure 2-4 sketch 6(welding neck), is there anything in code that states the small hub thickness has to be the same as the shell attached? The small hub end is 16mm (sa-105)and shell plate is 14mm (sa-515 70). Also, I did not quite understand why the...
  8. LY.Yan

    Tubesheet method of calculation

    Dear SntMan & r6155, Thank you for your replies and i am really appreciative of the advice I receive through this forum. The method of going by U-2(g) and using Tema calculations has been accepted. Thank you! Yours Sincerely, L.Y
  9. LY.Yan

    Tubesheet method of calculation

    Dear All, I have a replacement job with one tube-sheet integral to both sides and the other tube-sheet integral to shell and extended flange. The extended flange tube-sheet is attached to vessel B which is not being replaced. Both tube-sheets are of different thickness and different boundary...
  10. LY.Yan

    Sight Glass for sodium hydroxide

    Good morning, Thank you Mr EDstainless and Mr weldstan for the replies. The pH value is 14. Yours Sincerely, L.Y.
  11. LY.Yan

    Sight Glass for sodium hydroxide

    Good day to all, I need some opinion/advise on the material of sight glass in presence of sodium hydroxide. The design temperature is around 195 degC and pressure 1.3 MPa. The only offer i got from suppliers was quartz but i am curious if borosilicate can do the job. Thank you. Yours...
  12. LY.Yan

    Comparing Appendix 13 results with Finite Analysis Results(ANSYS)

    Good Evening, Thank you for the replies. The latest values i received was really promising with the advice here. I do have a larger discrepancy at the corners comparing it with the mid of the plates. Can i gather that might be due to proximity of the edges. Thank you again. L.Y Yan...
  13. LY.Yan

    Comparing Appendix 13 results with Finite Analysis Results(ANSYS)

    Good Day to all, I am trying to understand my vendor's ANSYS report by comparing the values for Membrane, Bending and total stresses between Appendix 13 and ANSYS. The Finite element was build with no tube ligaments and only internal pressure as loading condition. However the values for membrane...
  14. LY.Yan

    Sy value SA-423 Gr.2 Material @ 293 Degc Design Temperature

    Thank you for the replies. The yield stress is used in calculating actual stress during hydrotest. I should be able to input 255Mpa as my yield stress while using allowable stress values for internal at design pressure. Thank you again for the advice.
  15. LY.Yan

    Sy value SA-423 Gr.2 Material @ 293 Degc Design Temperature

    Good Day to All, For Sa-423 Gr.2 i am trying to get the yield strength at 293 Degc which is my design temperature. In section part D, Table Y-1, it shows one value 255MPa at 40degc only. I am confused as table 1A maximum temperature limit for VIII-1 is at 343 Degc and there are allowable stress...

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