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Recent content by scrobe

  1. scrobe

    ASME code, small vessels & Lethal service

    Read Section VIII, Div. 1 U-1(c)(2)(i). Any vessel greater than 6" in diamter irregardless of pressure is outside the scope of the Code. Lethal service does not enter in the determination of Code applicability.
  2. scrobe

    Update for UG-125 through UG-?

    Yes, you have pretty current information with the 1999 addenda.
  3. scrobe

    Section VIII, Div 2 Exemption

    Article KG-1 of Div. 3 states that "it is not the intent of this Division to establish maximum nor minimum pressure limits for either Section VIII, Division 1 or 2, nor minimum pressure limits for this Division." Using Div. 3 for high pressure (over 10 ksi) provides better engineering...
  4. scrobe

    pressure vessel code VIII

    TD2K is correct in regards to the jurisdictional authority. However, ASME Section VIII, Division 1 states in U-1(c)(2)(i) that vessels having an inside diameter, width, height, or cross section diagonal not exceeding 6 in. with no limitation on length of vessel or pressure are excluded from the...
  5. scrobe

    Tray support rings as external pressure stiffening rings

    Does anyone have any useful tips on how to rerate a trayed tower originally designed at 0 psi external to full vacuum by taking advantage of the tray support rings? My initial analysis shows the moment of inertia does not quite meet UG-29(a), but I think I'm ok for full vacuum based on the rules...
  6. scrobe

    Anyone hear about the Jan 2002 Addenda yet?

    What Section book will this non-mandatory appendix be published in? Can you point me to specific times when ASME announced public review for comment? Thanks.
  7. scrobe

    Limiting part of MAWP

    Many times, we as Users want to insure that the nozzle won't be the item that renders the vessel inoperable since in a process situation, the nozzle will be more likely to have erosion occur. Also, depending on the environment in which it's installed, there may be factors that will cause...
  8. scrobe

    interpret UG34

    See U-2(g).
  9. scrobe

    Pressure Vessel Design

    Another one to consider is "Guidebook for the Design of ASME Section VIII Pressure Vessels by James Farr and Maan Jawad. You should be able to get this from ASME. Check www.asme.org.
  10. scrobe

    Newsgroup, mailing list or discussion forum on pressure vessels

    You might also try www.coade.com although this forum tends to be limited to the pressure vessel design software of this company.
  11. scrobe

    Malleable Iron Fitting Rating

    In Class 150, the pressure ranges from 300 psi for temp from -20 to 150 F, to 150 psi for temp of 366 F, the temp of 150 psi saturated steam. In Class 300, it's size dependent, with the max temperature of 550 F resulting in max allowable pressure of 300 psi. It's very clear in Table 1 of ASME...
  12. scrobe

    Texas Boiler Law

    For anyone in Texas... Have you had any experience, good or bad, in trying to obtain an internal inspection extension for an unfired pressure vessel steam generator? Texas boiler law requires inspections not to exceed 84 months, and we would like to go beyond that due to leaking valves. Thanks.
  13. scrobe

    Nubbin

    Can anyone explain what "nubbin" is as used in ASME Section VIII, Div. 1, Appendix 2? Is there another text that provides good examples of a flange that has this component?
  14. scrobe

    Insulating Bolted Connections

    You're right kstaylor. Another thing that we have found in our petrochemical facilities is a contract EPC may have designed the piping systems with a certain class flange that cannot meet the design temperature criteria that results from insulating the flange; therefore a next higher flange...
  15. scrobe

    Leaking head gaskets in a large heat exchanger with high delta-T's

    In doing some research looking for technical information why one should not insulate flanges due to bolt relaxation resulting in leaks, I came across a paper from PVP94 that may be useful to you in your problem: Go to http://www.dynamicanalysis.com/pvp94.htm It's a pretty good paper.
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