Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. Cobra17

    Reducing flange analysis using FEA or Div 1

    If you want it thinner ditch the hub and make it a optional ring type like fig. 2-4(8) or (9) or (10) or (11) of VIII-1, or even a loose type.
  2. Cobra17

    Flange ID to Pipe OD Allowable Mismatch

    Considering Table 8C (CL.150) of B16.5 has a 24" slip-on flange ID, dimension B, at 24.25", I'd say 0.25" would not be an issue. Table 18C (CL.900) also has the same dimension.
  3. Cobra17

    flanges fixed with screw clamps

    A little late, but I've done lots of vessels with this type of bolting, typically called J-bolts. If you have a pull test on the J-bolt then you can do an appendix 2 calculation and the bolt circle is where the J-bolt makes contact with the flange lip. The pull force can then be converted to a...
  4. Cobra17

    What seismic codes should be used for Vessels to be installed on Offshore Platforms?

    46 CFR Part 54 deals with shipping pressure vessels, not sure if there is another part that deals with structures and seismic.
  5. Cobra17

    Is there a connection like UW-13 for direct connection of Body flange to spherical heads?

    so please point me to the specific paragraph(s) in UW/VIII-1 that I should be looking. Isn't the point of these forums to help others understand? I like learning new things, and obviously I've misunderstood this portion of the Code. I know the Code has roundabout ways of explaining things...
  6. Cobra17

    Is there a connection like UW-13 for direct connection of Body flange to spherical heads?

    @r6155 Please help me understand. by the picture you posted, a flange to hemi head is a Cat A. Using Figure UW-3 - A hemi head to a shell circ. is Cat A - A shell section to a shell section is Cat B. - A nozzle pipe to another nozzle pipe (nozzle shown on the top side of the vessel) is also...
  7. Cobra17

    Is there a connection like UW-13 for direct connection of Body flange to spherical heads?

    @r6155 do you have any code references or interpretations that specifically state that a hemi head to a flange is a Cat. A weld? "see UW", "Read again UW", "Why don't you read the text and not the sketch", "See also figure UW-3 on the left, the spherical head", "see my sketch" does no good...
  8. Cobra17

    Is there a connection like UW-13 for direct connection of Body flange to spherical heads?

    Why does UW-3(c) reference connecting flanges to formed heads, and per UG-32, hemispherical heads are considered formed. UW-3(a) says any welded joint within a formed head is Cat A, and specifically states circ joints to the main shell, transitions in diameters , nozzles or communicating...
  9. Cobra17

    Impact Test Requirement for nozzle assembly as per UCS-66

    What about UG-20(f)?
  10. Cobra17

    Code Case 2901-1

    No.
  11. Cobra17

    Pressure vessel internal and external corrosion - effective as one side corroded vessel ?

    If you use UG-27 (inside radius based calculation), 'R' should be based on the inside corroded thickness, then add the outside corrosion allowance to your calculated 't'
  12. Cobra17

    Appendix 2 Flange Thickness

    "Facing thickness greater than 1/16" shall be in excess of the required minimum flange thickness". flange required thickness = 2.1875" raised face thickness = 0.25" total thickness = 2.4375"
  13. Cobra17

    Screw holes in flat head flange

    If you calculate the opening as a diameter that includes the tapped holes you will be fine, then use UG-43(d) and (g) for the tapped hole depth (as others have said).
  14. Cobra17

    lenght of thickened shell for non-standard flange

    VIII-1 Figure 2-4 (6a) has the neck as 1.5*g0 min.
  15. Cobra17

    ASME VIII-1 Figure UCS-66.3 (b)and curve selection

    I guess I should have said lowest alphabetically.
  16. Cobra17

    ASME VIII-1 Figure UCS-66.3 (b)and curve selection

    The lowest curve. If the shell is curve B and the nozzle is curve A, curve A is used. See the PTB-4 example problems, Example 3.4
  17. Cobra17

    Non standard flange design

    If there is metal to metal contact outside the bolt circle it would be an appendix Y flange. You might have to fudge the gasket location in most of the commercial software since it's located on the 'inside' of the flange hub
  18. Cobra17

    Tangential Nozzle on Conical Transition

    sorry about the delay, got crazy busy. If you are talking about the smaller nozzles on the cone (D1 & D2 I believe), then I would figure out the developed opening size and hope it is exempt from area replacement. If not, then you could create a nozzle with the ID of the developed opening. OR...
  19. Cobra17

    46-4 DESIGN BY ANALYSIS ASME BPVC.VIII.1

    I would treat this similar to a pad flange, where the blue area is a reverse loose flange (or maybe a reverse integral in this case) per VIII-1 Appendix 2, then check the holes to UG-43(d) and (g). I would also do an area replacement check on the opening and limit the radius so it doesn't go...
  20. Cobra17

    Orifice Plate Bending - Mystery Calculation

    I use R.W. Miller's method for sizing orifice plates. Required Thickness = SQRT((0.681-0.651*β)*ΔP/Y)*D D= diameter of pressurized area (pipe ID usually) ΔP = pressure drop from one side to the other side of the plate Y = plate yield stress at design temp. β = beta ratio (orifice plate...

Part and Inventory Search

Back
Top