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  1. doct9960

    Cladding Disbonding at Tray Support Ring Attachment after PWHT

    Owner has requirements for new vessels with austenitic SS cladding to weld minor load-bearing internals (e.g. 1/2" thick x 3" wide tray support ring) after PWHT. According to our material engineer, the Owner requirement may be due to instances in the 1980's of clad disbonding after PWHT by the...
  2. doct9960

    ASME PCC-1 Appendix O Calculations

    Thanks! It will be quite a while before my company "approves" the new Build for official use so I created my own worksheet (still in progress). I am glad I started to create the worksheet. Compress just had input boxes for the maximum permissible bolt stress prior to flange damage (Sfmax)and...
  3. doct9960

    ASME PCC-1 Appendix O Calculations

    Are there plans to add the ASME PCC-1 Appendix O calculations in Compress?
  4. doct9960

    Bracket support movement

    For direct-coupled vessels, the general practice is to have one vessel fixed and the other one sliding. The sliding vessel would have slotted holes in its support. We've done this on vessels that are supported on lugs or skirt. Like you said, the problem is similar to a vessel with saddles. One...
  5. doct9960

    access openings

    lingeshgdvg, There's an ASME interpretation that seem similar to your case...
  6. doct9960

    Unstayed Flat Head Thickness (Metal to Metal Contact Outside the Bolt Circle)

    LawEngineering, Get a hold of the literature listed in Appendix Y-10. There might be example problems in those journals.
  7. doct9960

    Over-Torqued Bolts

    RCSC is for structural connections. For pressure boundary bolted flange joints, you should refer to ASME PCC-1 or ASME Section VIII, Div.1, Nonmandatory Appendix S.
  8. doct9960

    Large Non Radial Openings

    jakov, Appendix 1-7 can be used for non-radial openings.
  9. doct9960

    Trays with Cross-Over Pipe Downcomers

    Hello, We have a 2500 mm diameter column with trays that have 10" cross-over pipe downcomers. The trays are similar to Figure 10 in this AICHE paper... http://www3.aiche.org/Proceedings/content/Annual-2013/extended-abstracts/P326306.pdf Above the bottom blind tray is a distributor pipe...
  10. doct9960

    DIMENSIONS FROM VESSEL WORKING POINT AND %SLOPE OF VESSEL

    ugonna, Get a Trigonometry book. If you don't know trigonometry, draw the vessel with a 2D drawing software and get the dimensions. If you don't have a 2D software, draw the vessel to scale on paper and measure with a ruler.
  11. doct9960

    ASME Vessel Anchor Bolts

    dozer, Anchor bolts are not in the scope of ASME. As you mentioned, ASTM F1554 is the typical anchor rod for vessels on concrete, but for vessels sitting on a steel structure, I've seen ASTM A325 called out. You need to check the calcs done by the vendor. If they called out SA-325 for the...
  12. doct9960

    Lens Ring Flange

    marty, From page 505 of the Moss/Basic book: If you can get a hold of Structural Analysis and Design of Process Equipment by Jawad & Farr, check out Chapter 10.7.9. In there you will find formulas that you could use in your Appendix 2 calcs.
  13. doct9960

    nameplate date

    engineer54, When was the Manufacturer's Data Report signed? What's the Year Built indicated on the Data Report?
  14. doct9960

    Missing Stress Values in ASME II Part D

    The material is not approved for use when the stress values are not listed in ASME Section II, Part D If your Code of Construction is ASME Section VIII, Division 1, go to UCS-6 and Table UCS-23. If your material is not listed in the table, then it is not an approved material.
  15. doct9960

    Unusual Basering Anchor Chair Design

    fabineer, Go two pages back from where you found the skirt base design in Bednar's book. The book mentioned a way of checking if reinforcement is required at a skirt opening. Openings in skirts need to be reinforced by replacing the area taken out of the skirt. You can add a collar/sleeve...
  16. doct9960

    Unusual Basering Anchor Chair Design

    I have seen that skirt base design in the Pressure Vessel Design Handbook by Bednar. The anchor bolt and base ring analysis is pretty straightforward. There are available vessel software that can perform the base ring analysis. No need for FEA. I would be more concerned with the skirt opening...
  17. doct9960

    Is skirt (straight flange) mandatory for 2:1 elliptical forged head

    jtseng123, I believe SnTMan provided the correct answer in the old string. The answer is in UG-32(l). I also believe that you still meet the requirements of UW-13(b)(2). What did your AI say?
  18. doct9960

    Differents D'Ends have differents Thickness ?

    For vertical vessels, this could be due to the weight of the vessel, static head, wind/seismic loads, etc.
  19. doct9960

    Can I weld supports to repad after hydrotest?

    Hi jte, It's Friday and I'm down to my fifth pint of beer, so forgive me if I am incoherent. [spin] I love these healthy discussions, especially when experts and experienced people like you and metengr are involved. Since I've joined Eng-Tips back in 2006, I have valued the technical insights...
  20. doct9960

    Can I weld supports to repad after hydrotest?

    Hi jte, The OP is about a vessel that has not left the vessel manufacturer shop. The scenarios you mentioned are post-construction activities. In my opinion, after a vessel leaves the shop, any modifications or alterations to it are no longer in the scope of ASME Section VIII Div 1. I guess...

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