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  • Users: CuMo
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  1. CuMo

    Can Service Pressure Exceed Design Pressure?

    You can call any pressure "Design pressure" for a pressure vessel and you can exceed it as long as the design pressure does not exceed the maximum allowable pressure of the vessel (MAWP) and the installation to which the vessel is attached to. Sometimes both pressures can be taken as equal, and...
  2. CuMo

    Fatigue - Nozzle Inside Corner Radius

    Find and read Annex C from PD 5500. Table C.2 b) Branch connections. :)
  3. CuMo

    Shell forming method with low out of roundness for thin shell

    Why? Can't two shops in the US work to/achieve the same tolerance?
  4. CuMo

    External Pressure Stiffner Ring

    It is very rare that the code calculations for the stiffening ring position line perfectly with what you can do in reality. My approach would be to overdesign the size of the stiffening ring and place it as close as possible to where it needs to be.
  5. CuMo

    General Flange Design.

    What are you trying to achieve? The procedures for flanged joints design have been established so that they cover potentially all loading scenarios. A flanged joint subjected to internal pressure will experience mostly radial outward stresses which might however translante/transform into bending...
  6. CuMo

    Bolt Torque and Bolt preload query

    Bolts will relax after temperature increase therefore the clamp force will gradually be reduced. Hence why they need to be pre-stressed at ambient. A common practice is to pre-stress bolts to 310 MPa or ~ 50% Yield for B7 bolts at ambient. Read non mandatory appendix S.
  7. CuMo

    ASME Fixed Tubesheet Design Conditions in PV Elite

    "Shell-side / Channel-side Vacuum Pressures Enter positive values. For example, for full atmospheric vacuum condition enter a value of 15.0 psig. If no value is entered, then 0 psi is used." I would be looking at the Output closely because noone knows what PV Elite sometime does behind the...
  8. CuMo

    PV Elite Report - Tubes of the bundle

    What do you mean by: "I understand that of course tubes of the bundle always verify" ? Do you mean that tubes will always pass internal/external pressure calculations? In my experience, this might not always be the case. We have repaired old refinery exchangers, where the existing tube...
  9. CuMo

    API 660 loads on BEM Heat Exchanger Channel with Concentric Cone

    In PV Elite you have the option to subject flanges to external loads. UG-44 b) Design both the small and large flanges of the channel by adding the maximum Axial load and Equivalent Bending moment in the Torque; Loads; Partition Gasket Information module. This will allow PV Elite to transform...
  10. CuMo

    Hydro Test with Different Pressure Application for Shell and Tube Side

    I cannot comment on the procedure, but one piece of advise would be to check if the maximum allowable external pressure of the tubes is greater than the shellside maximum test pressure. I've seen many cases where this has been unaccounted for and exceeded.
  11. CuMo

    Inserting Floating Head Bundle into Shell

    Does your bundle have runner/sliding bars? Are they setup in the baffles correctly? Usually they are setup proud of the baffle edge by 1.5 mm. Did you check it for twisting before insertion? Because this might have happened during initial assembly too. Otherwise you might have something in the...
  12. CuMo

    Why need breathing hole on reinforce nozzle pad, do we have to block it after completion?

    Some plants require these to be plugged with high temperature grease, or if there is insulation, these holes can be threaded and tell tale tubes (1/4" NB or similar) be fitted protruding beyond/outside the insulation. Check what your plant/client preference normally is.
  13. CuMo

    UK PSSR, Regulation 10- Imminent Danger

    I think you might be able to find your answer in ASME VIII-1 UG-152: "(f) The relieving capacity of a pressure relief device for compressible fluids may be prorated at any relieving pressure greater than 1.10p" Without being an expert in the field and briefly reading between the lines, my...
  14. CuMo

    Skirt anchor template

    You make the template to match your skirt base, then you send it to the guys on site to prepare the concrete and predrill in the positions and install the anchors in place before the reactor arrives. Make sure you match the exact orientations for any deviations during reactor manufacture.
  15. CuMo

    pressure vessel

    https://ibb.co/HB2cc2M You're welcome.
  16. CuMo

    Tube to Tubesheet Strenght welds

    There is no problem to use either fillet only or groove plus fillet weld provided that the strength requirements of the joint are fullfilled. The groove + fillet might be preferred because it's normally a two weld run process - root weld run + cap weld run, where the start/stop positions of the...
  17. CuMo

    Welding inconel 800 ring to 516gr70 body flange

    Just do a LAP Joint flange design if allowed. Then no PWHT would be required. (Do not weld the Inconel to the C/ST whatsoever). You can weld the lap to neck followed by a face skim, something like this: https://ibb.co/WDx8Sts By the way, if your design code is PD5500 -> the lap must be...
  18. CuMo

    REQUIRED MINIMUM THICKNESS COVER FOR NITROGEN INJECTION

    9-10mm is really too thin for such a large diameter blind. The force across your blind will be at least: The area within the 900mm ID multiplied by your pressure or: Force [Newtons] = (900mm/2)^2 x Pi x P (where P is your pressure) Since you're working in SI units, it's best to convert your...
  19. CuMo

    Tube to Tubesheet Strenght welds

    Have a look at EEMUA Publication 143 https://www.eemua.org/products/publications/digital/eemua-publication-143 https://www.eemua.org/news/identifying-the-appropriate-techniques-for-tube-en
  20. CuMo

    Vapor Belt Distributor in Heat Exchanger

    Basically what the code is telling you that you have to investigate the stresses in the shell without considering the metal which has been removed from it. They call that the NET AREA (Whatever area is left after you drilled your nozzle holes).

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