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Recent content by victorpbr

  1. victorpbr

    Brasil-Pressure Vessel Approvals

    You are not gonna find "ART agreemeents" anywhere. The ART is a document that a licensed engineer (in brazil they have to be members of a council called CREA to be licensed) creates where he states some parameters of the vessel and assumes responsability for its design, so it is a custom made...
  2. victorpbr

    Brasil-Pressure Vessel Approvals

    Hi SMcI, In Brazil there are not any codes or standards that are mandatory for pressure vessels, they do have to comply with NR13 but it is mostly about documentation, and some inspection requirements. Usually vessels are designed based on codes like ASME BPVC, EN 13445, PD 5500, AD Merkblatt...
  3. victorpbr

    DBA - ASME XII Transport Tank

    Hi, I'm trying to evaluate the design of a cargo tanker using FEA, however I'm struggling to get a good model and boundary conditions to work on. Traditionally, when doing this by hand calcs, one calculates hoop stress and longitudinal stress from pressure, and then, treating the vessel as a...
  4. victorpbr

    How to calculate "Minimum width of saddle at top" from Moss Pressure Vessel Design Manual

    Hi, Usually for the support structures the value used for Fb is 0.6Fy, this is based on AISC Manuals, if you take a look on other procedures on the same book you will find some information about this. Can't help you with the h dimension though. Victor
  5. victorpbr

    safety factor and linearized stresses

    LIAM 7 I think other experienced members may give you better advice, but here is my 10 cents. It's not about ONLY achieving convergence. You have to fulfill all the requirements of the part. When you multiply your loads for a factor and achieve convergence it means that your equipment maximum...
  6. victorpbr

    Tangent Modulus Elastic-Plastic Method ASME VIII Div.2

    Hi, I think you should use the value from Section II, Part D. (as stated on ANNEX 3-E.1) Victor from Brazil
  7. victorpbr

    How to compute Shell&Tube Heat Exchanger outlet temperature using E-NTU method ?

    If you have tubes and shell diameter, you should be able to calculate U using geometric and conduction/convection constants. Sounds like a standard textbook question to me, take a look on some heat transfers books I'm sure you will find the expressions for U there. PS: This question would be...
  8. victorpbr

    Normalized VS as-rolled normalized

    Hi I may be wrong, but as-rolled normalizing seems like when you use plates that have been normalized during its fabrication, I think that in this context, the requirement is to normalize the whole vessel after it is fabricated. This requirement is probably to avoid hydrogen induced cracking.
  9. victorpbr

    Cold Stretching in Practice

    Hi, Sorry for the long time to reply this, got busy with some other stuff. Regarding pressure, yes the code says P is design pressure, but I also found an interpretation which says that MAWP + static head can be use as P. (...
  10. victorpbr

    Ambient Vaporizer - Capacity flow Estimation

    Hi Caloooomi, Yes, I agree with on that. That's how I design them, I got some proven designs and calculated the FlowRating/FinArea for some different models, not a linear relation though. Changes considerably depending on the flow rate, that why I am interest on understanding the method to at...
  11. victorpbr

    Why vent-line ice-covered at nitrogen tank depressurization?

    When you depressurize a gas, it will tend to expand in order to do that it will steal heat from the surrounds the faster you depressurize the faster this occurs the colder the piping will get, hence the umidity in the air is freezing when this occurs. The defrosting depends on your local...
  12. victorpbr

    How to add the fluid weight in ANSYS WB

    Managed to get it working. I was seeting hydrostatic acceleration same direction as gravity, when I changed the signal it worked. Loads were very weird before, now its ok. Thank you for your help
  13. victorpbr

    How to add the fluid weight in ANSYS WB

    Hi Erik I`m doing statics, but hidrostatic pressure load simulates only the pressure loading (only differs from pressure loading because pressure is inputed as a function of height), and do not consider the stresses generated by the fluid weight, different things. As I stated this can be...
  14. victorpbr

    How to add the fluid weight in ANSYS WB

    Hi, I'm modelling a horizontal vessel and would like to know how to input the weight of the fluid inside. I tried applying hidrostatic pressure, but the mass of the fluid wasn't added, i checked using the probe of force reaction on the supports. How could I input this mass to be considered?
  15. victorpbr

    When to use more than two saddles?

    Hi MJCronin, I`m not designing this vessel for any client, as I said I'm just studying the case based on some old drawing I found with little information on them. Material is SA-516 gr70N, CO2 is kept liquid at a temperature of -20 - -29 at pressures from 16-24bar I`m aware it's not good...
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