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Recent content by HungM

  1. HungM

    Does UCL apply to cladding on tubesheet?

    Hi, I have a question about the scope of ASME UCL. For a stainless steel STHE made with SA-240 304L on both sides, using an SA-965 F304L tubesheet with a corrosion-resistant cladding, and no welding to the cladding. Would this STHE fall under the scope of UCL rules? Please share your insights...
  2. HungM

    2:1 Head straight flange in SEC. VIII, DIV. 1

    Hi, All, Thank you for all your valuable opinions. To avoid challenges from the client and local jurisdiction in the future, we have decided to use the same thickness for the 2:1 head as the adjacent shell (25 mm). We are in the DDE phase, so there is time to reflect this. However, personally...
  3. HungM

    2:1 Head straight flange in SEC. VIII, DIV. 1

    Hi, gnc89, Thank you for your explanation; I appreciate it. Actually, we inferred the same thing as you – the Code implies that the S.F. should have the same thickness as the shell. In the case of a hemispherical head, Figures UW 13.1 (i) and (j) apply. But for a 2:1 head, if the S.F. is to...
  4. HungM

    2:1 Head straight flange in SEC. VIII, DIV. 1

    Hi, gnc89 & r6155, Thank you for your comments. In this case, the required thickness for both the 2:1 head and shell under internal pressure is nearly 10 mm. However, under full vacuum conditions, the head requires about 13 mm and the shell requires 23.5 mm. When looking into UG-33(i), it...
  5. HungM

    2:1 Head straight flange in SEC. VIII, DIV. 1

    Hi, The following welding detail is for attaching a 2:1 head to a shell. Does ASME BPVC Section VIII, Division 1 prohibit such a configuration? HungM
  6. HungM

    Maximum Allowable Stress for SB-677 N08904?

    IdanPV, EdStainless, So, based on your opinions, I can place a special order to have SA-312 pipe made to the tube size (in my case, 3/4” OD x BWG #10 – 3.048 mm)? I don’t have experience with this, but it seems like a viable solution. To summarize, using SA-312 as tubing is one possible...
  7. HungM

    Maximum Allowable Stress for SB-677 N08904?

    Hi, IdanPV, Thank you for your suggestions. However, I think using SA-312 pipe material for tubing is inappropriate due to the wall thickness. A possible solution is to use the SA-249 N08904 welded tube specification, but based on our previous project experiences, seamless tube would be the top...
  8. HungM

    Maximum Allowable Stress for SB-677 N08904?

    Hi, experts, I am currently working on a Shell and Tube Heat Exchanger (STHE) design with the tube material specified as SB-677 UNS N08904. Table UNF-23.3 lists SB-677 UNS N08904, but I can't find the allowable stress values for it in Table 1B of Section II, Part D, Subpart 1. Does anyone know...
  9. HungM

    Same tube joints for top and bottom tubesheets of vertical HEX? (ASME Code)

    Hi, All The tube-to-tubesheet joint design considers the tube joint of lower strength (type joint f in Appendix A). But due to some practical concerns, for example, drainage, the tube joint of the top tubesheet has been modified to strength weld. My current option to persuade the local inspector...
  10. HungM

    Same tube joints for top and bottom tubesheets of vertical HEX? (ASME Code)

    Hi, All As stated in UHX-13.5.9, we can use UW-20, UW-18(d), or Appendix A to design the tube joint. But does the Code requires the user to have the same tube joints for the tubesheets? Any restriction like as UHX-13.2 is mentioned elsewhere in the ASME Code? Considering this example of...
  11. HungM

    API 660 Section 10.2.11

    r6155 and SnTMan Thank you for giving your opinions. Talk to the owner and seek a method to which all consent should be the solution for this matter. Regards, Hung
  12. HungM

    API 660 Section 10.2.11

    Hi, r6155 Yes, the views of the owner play a vital role in the implementation of work. But, considering the site condition, there is a difficulty in obtaining the water when doing the re-pressure testing. Besides, except for gasket replacement, there are no other works done to the equipment...
  13. HungM

    API 660 Section 10.2.11

    Hi, All As stated in API 660, Section 10.2.11, the flanged joints that have been taken apart after the final pressure test shall be reassembled with new gaskets and re-pressure tested. My question is that under what condition the reassembled flange-joint is exempt from re-pressure testing...
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