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  1. uglyspec

    Compress FEA Module

    Is Compress removing the FEA module in the next Build? If so, why?
  2. uglyspec

    Tubesheet Tube Hole Grooving Depth

    Somewhat related topic, as a standard our company utilizes a 1/16" x 45 deg chamfer on the shell side of every tubesheet tube hole. No chamfer on the tube side hole. Is a shell side chamfer common industry practice? Thanks again!
  3. uglyspec

    Tubesheet Tube Hole Grooving Depth

    Hi, For double grooved and roller expanded tube to tubesheet joints on a shell and tube heat exchanger, what tube hole groove DEPTH are you using? Thanks!
  4. uglyspec

    LWN Nozzle with Re-Pad

    Hello, Is it considered good/sound engineering practice to design a pressure vessel nozzle utilizing a long weld neck flange and a reinforcing pad? You don't see this combination very often and I am assume there must be a reason. Thanks
  5. uglyspec

    China Code / GB-150

    Those familiar with the China Code for pressure vessels should know what I am talking about. Cost to have the document translated into English can be very expensive.
  6. uglyspec

    China Code / GB-150

    Hello, For the design of heat exchangers, is welded pipe permitted? are welded tubes permitted? Thanks!
  7. uglyspec

    Slow Cooling Stainless Steel Weld

    304 and 316 stainless steel (austenitic)
  8. uglyspec

    Channel flange replace.

    If you choose to perform no calculations at all and fabricate exactly to the original design, the following must be noted in your data report remarks for that part: "no design responsibility". Regards
  9. uglyspec

    Slow Cooling Stainless Steel Weld

    Hi, Is there any benefit to applying an insulated blanket over a stainless steel weld to promote slow cooling? Thanks!
  10. uglyspec

    Roller Expanding Duplex Tubes in a 304ss Tubsheet

    Metengr - Tube holes would be double grooved. I was also going to strength weld the tube joint. SnTMan - I could change the tubesheet to 2205 duplex but it would exceed the job budget. If the roll quality is that poor, is it even worth rolling?
  11. uglyspec

    Roller Expanding Duplex Tubes in a 304ss Tubsheet

    Hello, Has anyone had success roller expanding 2205 duplex tubes in a 304ss tubesheet? (tube yield is approx. 60k / tubesheet yield approx. 30k) Tubeside gas has some hydrogen content. Thanks!
  12. uglyspec

    Tube to Tubesheet Joint Welding

    Pradip, I am referring to manual GTAW with the addition of filler metal to create a strength weld. Tube diameters are typically either 5/8" OD or 3/4" OD. When you use the term "one go" are you referring to welding the tube joint in one continuous pass 360 degrees around? If so, in the 3G...
  13. uglyspec

    Tube to Tubesheet Joint Welding

    When welding tube to tubesheet joints in the vertical 3G position, what is the proper weld progression? Can I start at one point and weld 360 degrees around the tube to completion (uphill then downhill.) Or should I start at the bottom and weld upward 180 degrees stop, then start at the bottom...
  14. uglyspec

    Tubesheet design temperature

    It should be based on the design pressure indicated on the nameplate.
  15. uglyspec

    Dark Areas of Stainless Steel Welds

    The welds shown in the original picture were passivated.
  16. uglyspec

    Dark Areas of Stainless Steel Welds

    some said it could be Silica?
  17. uglyspec

    Dark Areas of Stainless Steel Welds

    That's what I was afraid of. Short of removing the weld, is there any way to correct the issue?
  18. uglyspec

    Dark Areas of Stainless Steel Welds

    Hello, I am looking at a fillet on 304ss material that was welded with GMAW pulse. Some welds appear to have dark discoloration - see attached picture. Is this normal? Thanks,http://files.engineering.com/getfile.aspx?folder=be7fd2ca-1808-4ace-bea9-9a1bcaf863e0&file=55248.jpeg
  19. uglyspec

    Reinforced pad split into half?

    Yes, you can split the pad without penalty as long as it is split down the circumferential axis - lowest stress.
  20. uglyspec

    2205 Heat Exchanger Tubesheet

    -20f

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