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  • Users: JBW76
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  1. JBW76

    Tube Buckling

    Clarification on the design conditions, they are the MAWP, not necessarily the operating conditions: The exchanger service is " DE-ETHANIZER REBOILER" The MAWP (shellside) is 308 psi @ 650 with a -20 MDMT @ 308 psi. The MAWP (tubeside) is 190 psi @ 650 with a -20 MDMT @ 190 psi.
  2. JBW76

    Tube Buckling

    Hello all and thanks in advance here, I've got a Shell & Tube Heat exchanger with 4 3/4" thick tubesheets. (Stationary and Floating) It's a Tema type AES exchanger -- 61" I.D. shell and channel with (2544) 3/4" o.d. Tubes on a 1" 45 degr. rotated sq. pitch. It's all carbon steel, SA-516-70N...
  3. JBW76

    Impact Testing Exemption - Stress Ratio

    This is a continuation of my previous thread. I'm trying to get an exemption for my 2" thick 32205 duplex tubesheet from Impact testing. According to UHA-51 (G): "for vessels when the coincident ratio of design stress in tension to allowable tensile stress is less than 0.35. MY problem is...
  4. JBW76

    Duplex 2205 Tubesheets

    I have 2" thick duplex stainless tubesheets with duplex (S31803) 3/4" o.d. straight tubes, I'm being forced into impact testing to -50 deg. F. for the tubesheets, and so my question is: Is there any solution that would let me out of this impact testing requirement? Any exemption? From what...
  5. JBW76

    Vertical Exchanger - Tube Projection

    I've got a 96 tube heat exchanger that was formerly horizontal, now is vertical. I'm replacing the bundle on it and the tubes are to be Seal Welded and Rolled. Do I need to do anything different as far as tube projection because it is vertical?
  6. JBW76

    Nubbin on a Body Flange

    What drives the requirement for a Nubbin on a Heat Exchanger Shell Flange?
  7. JBW76

    Heat Treated Heads

    Is this what UCS-56 (e)& (f) is telling me regarding "WELD REPAIRS" Is a "WELD REPAIR" considered to be the act of welding/adding nozzles and a skirt cylinder to the 2:1 elliptical head?
  8. JBW76

    Heat Treated Heads

    The head is 5/8" thick. (Nom.)
  9. JBW76

    Heat Treated Heads

    'david339933' -- thanks for the help. My vendor sent the proper documentation, I just haven't gotten them in front of me. I think most people believe that if the heads are heat treated, then you cannot weld or burn on them without heat treating them again. And if you can, then it's because...
  10. JBW76

    Heat Treated Heads

    The heads are SA-516-70 and they were exceeding the EFE fiber elongation 5% -- The purchasing manager took it upon himself to get cold formed heads with the requirement that the vendor stress relieve. I don't have the paperwork on the vendors stress relief procedure yet, but I will. The vendor...
  11. JBW76

    Heat Treated Heads

    Thank you, I have requested from the Head vendor all documentation, and will bury myself in the ASME code book reading. I will also buy Hot formed heads next time.
  12. JBW76

    Heat Treated Heads

    IT is a section VIII vessel - and the vessel was not required to be Heat treated as a "service requirement" The vendor heat treated the heads after forming them is all I know - I don't have his process, or his temp/hold times. They were baked out after being formed is all I know at this point
  13. JBW76

    Heat Treated Heads

    I'm building a vessel and the heads were "Cold Formed" -- the vendor has heat treated them and shipped them to me. These heads are to have Nozzles welded into them and then (obviously) they will be welded onto the vessel Cylinder. Am I required to Heat Treat The heads again after they have had...
  14. JBW76

    Tube Hole Serrations in a Floating Tubesheet

    Thanks "EdStainless' - would you say it's common practice within the industry to have the serrations in both tubesheets though
  15. JBW76

    Tube Hole Serrations in a Floating Tubesheet

    This will sound silly, but I have a legitimate question. Is there any reason or benefit why the floating tubesheet would NOT get tube hole serrations? This is a Roller expanded only tube bundle (no Tube end welding) Thanks in advance
  16. JBW76

    Cold Formed Heads

    At what (ballpark) temperature are "Cold"- formed heads spun/formed at?? Can they be heat treated after being cold formed and THEN welded to the vessel Shell. I'm trying to avoid heat treating the entire Pressure Vessel and I'm stuck using these cold formed heads.
  17. JBW76

    Fiber Elongation and PWHT

    This will probably be an easy one for most of you here, but I'm stuck so here goes: I've got a Carbon Steel Vessel 5/8" thk. shell and 1/2" thk. 2:1 heads that are Cold Formed. I'm getting a "fiber elongation exceeds 5%" warning and I'm wondering if I must heat treat the ENTIRE vessel? If I...
  18. JBW76

    Tube to Tubesheet Mock Up details

    On a shell and tube heat exchanger and for tube-to-tubesheet welding. QW-193 says nothing about the length of the tubes to be used for the mock-up itself. It also does not note the size of the mock tubesheet, only the thickness (2") I'm using 10 x 10" and I'm hoping that is large enough...
  19. JBW76

    Tube To Tubesheet Weld - Mock up Detail DRAWING

    Does anyone have an old Mock-up detail Drawing they would not my sharing? I'm making one, and going from memory at the moment. I remember Q-193 dictates that I need ATLEAST ten (10) tubes and my 'mock' tubesheet needs to be the same thk's as the real tubesheet or 2". Do I need to include...

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