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  1. 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...
  2. 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?
  3. victorpbr

    When to use more than two saddles?

    Hi, I've been looking at some old drawings of refrigerated CO2 storage vessels, with capacities ranging from 500- 600 tons (DIA 3000-3800, length (30-50m), and all of them had 3 saddle supports. In the searches I made, I've seen that it is not a good practice to use more than 2 saddles, and...
  4. victorpbr

    Protection Against buckling (ASME VIII-2 Part 5)

    Hi, I'm studying Part 5 of ASME VIII-2 and am in doubt about if I am interpreting this correctly. Could you please confirm if I got the idea right? Here is what I understand. Type 1 analysis is a eigenvalue buckling situation where pre-stress is from an elastic approach. Type 2 analysis is a...
  5. victorpbr

    What to check on this kind of supporting

    Hi, I have a horizontal vessel (ASME VIII div 1) that needs to be supported by two points on its cross section, as shown in the attached figure. Its a problem of two localized inward radial loads being applied to a cylinder, I'm not familiar with the WRCs procedures so I do not know if that is...
  6. victorpbr

    Meshing Pressure Vessel - Tips Needed

    Hi, I`m trying to mesh a simple pressure vessel as shown in the attached picture. Ideally I`m looking for quad meshing and to control the number of elements through thickness. I`m not very familiar with the advanced functions yet and the ones I tried resulted on errors. Could anyone with...
  7. victorpbr

    Bending Moment at Pipe centre

    Hi I have a pipe supported by saddles like the attached sketch. I'd like to apply a bending moment at the centre of the pipe section as shown at the sketch, at the point above the saddles. However I'm not being able to do that, any ideas on what procedure I should use?] Sketch...
  8. victorpbr

    Internal manhole Flange

    Hi, I'm designing a horizontal vessel for refrigerated CO2 and the client wants me to use an internal manhole flange, as the one shown in the attached file, he claims to be using it for several years never had any problem. I've never designed or even specified this type of flange before. Any...
  9. victorpbr

    Similarity between USI-SAR80T and SA-517

    Hi, There is a metal produced in Brazil, by USIMINAS denominated USI-SAR80T, it is a quenched and tempered metal and it told to be ~similar~ to SA-517, however I do not know to which grade. I have not be able to fit it properly into a specific grade. Could someone help me out? Here is the...
  10. victorpbr

    Cargo Tank Design

    Hi, First of all, I`m not quite sure if this is the proper place for this post, if not, please advise me. I'm studying the design of Cargo Tanks for the transport of Hazardous Products, specifically the transport of refrigerated CO2. In my country (Brazil) we have a local regulation that is...
  11. victorpbr

    Elastic-Plastic Analysis of Vessels

    Hi, I`ve started some reading on Elastic-Plastic analysis, according to ASME VIII-2 Part 5. I still have a long path to go, but my first question is about which is the more suitable model of hardening to use? On ASME PTB-3, I saw that Prager hardening is used on ABAQUS software, unfortunately...
  12. victorpbr

    Liquid Nitrogen Vaporizer Design

    Hello, Does anyone have experience on designing vaporizers for cryogenic applications? I'll be using fin tubes, on the input I have liquid nitrogen at -196°C and on the output I want gaseous nitrogen somewhere between 10 to 20°C. The mass flow is known as it is pumped by a cryogenic pump, and...
  13. victorpbr

    Cold Stretching vs Hydrostatic Test

    Hi, When performing cold stretching on austenitic steels to improve my allowable stresses in cryogenic aplications. Do I still need to perform an hydrostatic test? Also, can someone with knowledge on cold stretching check which one of the below is correct, procedure 1,2 or 3. Procedure 1: 1-...
  14. victorpbr

    Higher Allowable Stresses for Low temps in Division 2

    Hi, I'm trying to figure out what value for maximum allowable stress to use for division 2, it is a vessel for liquid nitrogen storage, hence working temperature of -196°C. On ASME II - D: For Division 1 we have a maximum allowable stress of 115 MPa (-30 to 40°C) (Table 1A) For Division 2 we...
  15. victorpbr

    Design Strength, AD2000 Merkblatt code

    Hello, I`m studying the AD2000 code, However I`m having difficulty setting the design strength stress for my calculations. Let me show an example with a simple calculation. From part B1 we have that the minimum thickness for a cylindrical shell is given by: s = (Da*p / (20*K/S*v+p)) + c1 + c2...
  16. victorpbr

    Understanding physics of this ozone injector

    Hello, I visited a sugar plant last week and found myself intrigued with an ozone injector there present and did not fully understand the physics behind it. I made an sketch and attached it. They use it to kill bacteria on the sugar cane juice without using chemicals. So basically it works...
  17. victorpbr

    Electric Arc detection system

    Hi, I have a industrial ozone generation system, composed of 800 corona discharge lamps. They operate at 35 kV and the current in each lamp is of about 40 mA. Due to environmental conditions, occasionally an electric arc occurs between the metallic outer surface of the lamp and some other...
  18. victorpbr

    Apply Pressure to only an area of the cylinder

    Here's the deal, I'm modelling a cylindrical pressure vessel, and I need to apply loads and boundary conditions to the location where it is supported, hence I need to know how to apply the conditions only to the 2 arc areas related to the supports.

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