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  1. EngAddict

    Gasket Selection and Minimum Required Bolt Preload

    Thanks for the links. I was thinking relatively small displacement. Assuming large displacement (permanent plastic) how much would be acceptable (even beneficial) and when would you classify as too much cupping (potential for undetected leakage) that should be replaced?
  2. EngAddict

    Gasket Selection and Minimum Required Bolt Preload

    Surely the seal would be held by the outer winding portion, not the centring ring. Do you have a a reference link for the papers TGS4? Under high external loading and cyclic operation I would think additional bolt loading would be beneficial to maintain the seal.
  3. EngAddict

    rename file/change references

    There are lots of ways to do this. As you know copy in design assistant will allow you to create a copy and rename them then save. You could also do it manually like you currently do but remove the original named part from the project search path then resolve the link to the newly named file...
  4. EngAddict

    Box Header Design

    If the header is only wide enough for the nozzle then the edge of the nozzle typically sit over the tube sheet. This stiffening by the tubesheet usually negates the need for reinforcing checks. However with swaged nozzles you really need to run FEA, the opening is larger and the sides of the...
  5. EngAddict

    Von Mises beyond Yield, is it valid for Ultimate loading - Part 2

    Yielding does not always mean failure as the theory suggests. In the pressure equipment industry von Mises stress can be compared to twice yield to check for ratcheting / shake down. Provided the stress is self-limiting by nature this allowable limit works well where localised yielding is...
  6. EngAddict

    Output Results Stresses

    I mean the minimum would be 3 nodes, one for each translational DOF. i.e. select one node to retrain your x-translation, another node for your y-translation, etc. In piping systems that experience thermal expansion where the end of the pipe is restrained from freely displacing, such as at a...
  7. EngAddict

    Output Results Stresses

    Continued.. Not sure if your restraints reflect your actual model but I assume two nodal restraints don't. Also, for the last few releases of Algor you don't have to have the same mesh in your thermal and static analysis, so as required you can add mesh refinement in your areas of high stress...
  8. EngAddict

    Output Results Stresses

    Discretisation errors could lead to the model being unstable, plus your restraints are not symmetrical, so I like to restrain the three DOF. If it suits your analysis you may choose to use springs in some directions to prevent over-stiffening your model. However most software should produce...
  9. EngAddict

    Minimum Nozzle Projection Requirement Per ASME VIII Div.1 ?

    Just whatever is functional for removing studs, considering any insulation if applicable. Check the client specification, if they don't list anything then probably go with some standard offsets from the PV books.
  10. EngAddict

    Impact Test of Stiffening Rings

    Duwe6, do you mean low cycle fatigue (ratcheting)? I wouldn't expect the stress to be high enough just above ambient. Is it a particularly corrosive environment to develop SCC? I would accept the substitute if they impact test, if they don't want to pay for testing then they should fabricate it...
  11. EngAddict

    Dim Styles

    Point it to your dimension style in the Object Defaults.
  12. EngAddict

    How to Calculate Blind Flange Thickness With Opening

    I would start with a standard 'off-the-shelf' B16.5 blind, partial pen weld it to the pipe and design as an integral slip-on to App2. Then you might find you may not need to increase the thickness. If you do need to increase the thickness then fabricate with the rest of your forgings or machine...
  13. EngAddict

    How to Calculate Blind Flange Thickness With Opening

    "Is it still qualified as B16.5 ?" No, it is custom to App2 (even if the thickness does not change).
  14. EngAddict

    How to Calculate Blind Flange Thickness With Opening

    "also I have to do calculation for compensation of opening as per UG-37 ?" No, if you designed it as a flat end then you would also have to do the reinforcing checks but the reducing flange already includes the reduced area in the calculation.
  15. EngAddict

    Books of Basic of Pressure Vessel Design and Process

    This is my reasoning.. 75% of the book you will never use, 20 years ago it would have been useful but not today. The other 25% you can get from the other books but in greater detail and with more theory. We have Bednar at work and I have an electronic copy of Moss and they are both very good...
  16. EngAddict

    Books of Basic of Pressure Vessel Design and Process

    Don't get Megesy, get Bednar instead. I will swap anyone my copy of Megesy for Bednar or Moss if they are interested?
  17. EngAddict

    FEA models in Algor or Inventor

    Yes, way too cumbersome, particularly for the type of geometry you would use in PV design, like nozzles, flanges, etc. You can keep a live link between the parametric Inventor model and the Algor geometry as well (not the best but it works). The stress linearisation tool still needs big...
  18. EngAddict

    FEA models in Algor or Inventor

    Create in Inventor then import to Algor would be your only practical method.
  19. EngAddict

    Inventor assembly heirarchy

    I work with assemblies with thousands of components, never once have I had an issue. The only time I ever got constraint errors was when I first learn 3D modelling and I didn't know what I was doing. Sounds more like a case of good 3D modelling practices, not a program specific issue. Logical...
  20. EngAddict

    Inventor basics for a convert

    Your comments are pretty typical for new users, you have to persevere and don't expect it to drive like the last package. There are some features that are better than others in all programs, you might find you actually like some of the Inventor features better after a while. I knew a user around...

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