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  1. BigTank

    Tube-To-Tubesheet Joint - Interface Pressure

    I have nothing to add other than any answer to this question will help more than one person. Several times I've begun to attempt some sort of elastic balance with limited success. -------------------------------- Fitter, happier, more productive
  2. BigTank

    Figure PW-43.1 vs. A-73

    So I think I figured this out. Instead of arrows on the lines that indicate the action (direction) of the forces, they put arrows on the leaders that label said lines. In other words Wr is a radial (to the tube centerline) force. W acts at some angle to the tube CL with an eccentricity...
  3. BigTank

    Build 7400 Model Aspect Ratio

    Very good. Thanks again, Tom. -------------------------------- Fitter, happier, more productive
  4. BigTank

    Build 7400 Model Aspect Ratio

    Thanks for the info on the support status, Tom. No, I haven't submitted a ticket yet. Like I said, to me it's a minor annoyance. I didn't feel I needed to bother Codeware with the issue, but I might submit one just to make them aware. Thanks! -------------------------------- Fitter...
  5. BigTank

    Figure PW-43.1 vs. A-73

    Can someone reconcile 'e' for me here? What is the intention of 'e'? Moment arm? That's what A-73 suggests. If so, PW-43.1 is a terrible visual. -------------------------------- Fitter, happier, more productive
  6. BigTank

    Build 7400 Model Aspect Ratio

    To be clear, Compress is the only piece of software displaying as such. My monitor settings are correct for the aspect ratio of my monitor. -------------------------------- Fitter, happier, more productive
  7. BigTank

    Designing to ASME VIII & need compliance to PED.

    We are going through the qualification of a standing design to PED compliance. As is alluded to (and explicitly stated), applying CE certification isn't a linear thing. We hired a TUV Rheinland to get us through the process. As it turns out, we will be certifying our exchangers onesy-twosy as...
  8. BigTank

    Build 7400 Model Aspect Ratio

    This is a minor problem, but one that is mildly bothering me, nonetheless. So I thought I'd pose the question here since it's not a matter of functionality but one of aesthetics. Since Build 7400, the model visuals have been 'squished' like when viewing television broadcasts at 4:3 aspect...
  9. BigTank

    vents and drain for heat exchangers

    SnT, you in America? Just curious... -------------------------------- Fitter, happier, more productive
  10. BigTank

    Buckling Calculations

    Roark's has some formulas for bending with axial compression. Treat the pipe like a beam for the bending and compressive load. Re-arrange the Code formulas to find stress (pressure) if possible [I'm too lazy to crack Section VIII sitting right here beside me]. Put them in a blender...or add...
  11. BigTank

    vents and drain for heat exchangers

    RE: shell & tube stuff, I'm with strain2. The only time I would consider adding connections of any sort that weren't spec'ed on the process data sheet is if the working fluids were such that cracking loose a process connection to drain the unit would be a bad idea, i.e. caustic fluid, as the...
  12. BigTank

    Sect VIII, Div1, UHX 13, Sy @ T & Sect II-D, Table Y-1

    Thanks, SnT. That's how I see it as well. My confusion is: if that's the intention of the Code, why didn't they just say it? I'm suffering similar disconnection with popular interpretation re: UW-12 long. seam (circ. stress) joint efficiency...the Code implies, but leaves very large gaps in...
  13. BigTank

    Sect VIII, Div1, UHX 13, Sy @ T & Sect II-D, Table Y-1

    Section VIII, Div 1, UHX 13.3 Nomenclature states for yield stresses: "NOTE: The yield strength shall be taken from Table Y-1 in Section II, Part D. When a yield strength value is not listed in Table Y-1, one may be obtained by using the procedure in Step UG-28(c)(2)3." Could someone please...
  14. BigTank

    Allowable Bolt Stress for A307

    That depends on the governing code and the customer's requirements. You could use ultimate strength if you want to...wouldn't be responsible, but you could use it with a healthy safety factor. (I don't think anyone actually would. It's just an illustration.) If there is no verbage, then I...
  15. BigTank

    B31.1 Branch Ligaments

    pennpiper: PG-52 is Section I of BPVC, so I did mention it in the original post. I guess I didn't realize that you wouldn't know that unless you knew that part of the BPVC Code DekDee: thanks for digging! An engineer at our company that recently left liked to apply Code methodology where the...
  16. BigTank

    B31.1 Branch Ligaments

    You've never heard of 'ligaments' mentioned in ASME BPVC? You must not work with that code. -------------------------------- Fitter, happier, more productive
  17. BigTank

    B31.1 Branch Ligaments

    Is there a provision in B31.1 that calls on PG-52 or any other section of any other ASME Code in regards to ligaments between multiple branch connections? -------------------------------- Fitter, happier, more productive
  18. BigTank

    MODIFICATION OF ELBOWS

    One caution I can think of: markings. Typically the markings for a wrought part are very close to one end. If this item is to be Code-compliant, it must retain it's markings, correct? Be sure you trim the correct end. As far as calculations go, well...I'm not familiar enough with 31.3...
  19. BigTank

    Tubesheet to Shell RT Requirements

    Taking a step back toward the more obvious: you might want to talk with someone that performs radiography. Corner joints generally don't yield good x-ray results. It's very uncommon for these types of joints to be x-rayed. I'm sorry if that's TOO obvious, but you never know. Not everyone has...
  20. BigTank

    Flange problem

    If the flange is B16.5 standard, it is required to be marked as such. Likewise, the size and class is a required marking. From there, the B16.5 standard will give you dimensions. I assume that, because you looked for the material in IID, that you want the rating at temperature as well. That...

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