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  • Users: BZ29
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  1. BZ29

    API 620 Annular plate

    What if API620 tanks are also being used in oil refinery? Similarly, there is no testing mentioned for shell to bottom fillet weld, unlike API650 which requires penetrating oil test for this joint.
  2. BZ29

    API 620 Annular plate

    I have gone through API620 in detail and found no requirement for RT of annular plate, annular plate thickness & width calculation unlike API650. I am just curious about the possible reasons, as API620 tanks seems to be more complex.
  3. BZ29

    Difference in Area Calculation for Nozzle in PVELITE

    Please check your design parameters. There must be internal pressure/static head in above case, while the below case only have external pressure.
  4. BZ29

    API 650 Annex G Aluminum Geodesic Roof

    As stated by JStephen. As per API 5.9.5.6, in my opinion as well, lowering of walkway is just for safety purpose of worker in case of open top or external floating roof. And as per 5.9.5.2 in case of lowering the wind girder another curb angle is also required at the top. Alum. geodesic roof...
  5. BZ29

    API 650 - Allowable External Loads on Tank Shell Openings

    Yes, interpolation should also have been on logarithmic scale. I have mistakenly done linear interpolation in above figure. Using graph it can only be performed through approximation i guess.
  6. BZ29

    Pressure Building Circuit for Cryogenic Storage Tanks

    In vacuum insulated cryogenic tanks, there is a pressure build up circuit/coil along with pressure regulator valve, that automatically maintains the pressure in tank, if pressure/temperature decreases. while high pressure is relieved through PRV, resulting in wastage of product as well. In case...
  7. BZ29

    API 650 - Allowable External Loads on Tank Shell Openings

    No There is no tabulated graph i think. This is a logarithmic scale and you can interpolate between the values graphically. I have used same example values to interpolate graphically.
  8. BZ29

    API 620 high compression area requirement

    Yes, sure. I will reconfirm it again before sending them an email.
  9. BZ29

    Stiffener Rings

    r6155: Not sure about material selection as design & process was not in scope of work. Thank you to all the experts for providing valuable insights / guidance.
  10. BZ29

    API 620 high compression area requirement

    Yes, i was using R/D as 1.2. Now i have changed it to 0.8 which reduced the required area to half. But actual issue is, that software was not calculating the compression area correctly as per the selected detail. Now i have calculated it manually and it was significant increase in area. So the...
  11. BZ29

    API 620 high compression area requirement

    Hello experts: I have sometime came across large API 620 tanks having significant design pressure, which requires a very large compression area. i tried using all of the available Compression-ring Juncture options, but still there used to be a big difference. eg. presently i have following tank...
  12. BZ29

    Stiffener Rings

    Geoff13: Not directly. There rings are outside the vessel. But it seems, these are surely to manage longitudinal stresses. Following drawing will better explain the schematic. Saplanti: You can see the internals in following drawing. There is a perforated 20mm plate covering the entire area in...
  13. BZ29

    Stiffener Rings

    Snickester, Krausen: Thank you for your insights. Yes it is most probable, that they decided to add such stiffeners through FEM analysis to keep stresses in limits. r6155: Yes, its a new pressure vessel Material: SA516 70 Design pressure 0.68 Mpa / 6.8 bar Design temperature: 50 C / 122 F...
  14. BZ29

    AMETank Software Issue

    Software is correct. It depends on the selection of curb angle/compression ring joint configuration. (Figure F.2—Permissible Details of Compression Rings) As per your case it seems to be detail(d) selected There must be joint configuration selection option in software. I have not used AMEtank...
  15. BZ29

    Stiffener Rings

    Received some pressure vessel drawings, having following data ASME Sec VIII Div.2 Dia: 5500mm Lenght: 20200mm Thickness: 14(Shell) / 10(heads) Hemispherical heads supported on 3 saddles. Vessel have internals of more than 20000kg Although design is not in my scope of work, just curious to...
  16. BZ29

    How to Get Fabrication Drawing from ASPEN EDR

    If you have received from process department, then may be its mechanical design is not yet done. have you checked for it? fabrication drawings will be generated after mechanical design.
  17. BZ29

    Design Code For Atmospheric Tank Like Pressure Vessel

    UL-142 can be used. Its scope includes pressure from -0.5 psig to 1 psig.
  18. BZ29

    API 650 External Pressure design

    MJCronin: No i did not called them. This was not a software functionality issue, rather it was code understanding issue.
  19. BZ29

    API 650 External Pressure design

    JStephen: Thank you for guidance. I was trying to understand it completely before replying which i have understood now to much extent. There was some confusion, as i was checking this in API650 12 edition, and there it was not mentioned clearly, regarding the addition of 0.25kpa external...
  20. BZ29

    API 650 External Pressure design

    Please correct & guide me if my understanding is wrong regarding these two issues: 1) With Ref to API650 5.2.1(b), upto 0.25kpa external pressure, no calculation is required (safety against such vacuum is inherently built in its internal pressure design). Annex-V is for pressure above 0.25kpa...

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