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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.

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.

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

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...

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.

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...

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.

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

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.

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...

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...

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...

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...

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...

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...

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.

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

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

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...

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...