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  1. 020100

    ASME section VIII division II

    Thanks, Prex. It appears to me that the rule was developed using formulae before FE was discovered. The code is trying to pick up more from FE, but it has not fully accomodated FE approach in the rule if I understood all of replies. It might be very straight forward for somebody who has been...
  2. 020100

    ASME section VIII division II

    Thanks, Prex for still being patient and answering all of my questions. Especially, I don't think that I could get the answers from any reference book. Your answer is related to theory of the coding instead of searching for tables. I really hate to search for the tables and classify the stress...
  3. 020100

    ASME section VIII division II

    Hi, Prex, Thanks for your great explanation. It makes perfect sense as well. I have two more questions (1). Why do we need to have more than one criterion (primiary, local membrane, bending, secondary, peak have different safety factor)if all of loads will generate both primary, secondary...
  4. 020100

    ASME section VIII division II

    Many thanks, Prex and TGS4 for being patient. (1). It is clear for safety factor. (2). I am ordering the book as TGS4 suggested. I am pretty sure that I will have questions after I read it. I was trying to clarify one thing: All of stress are related to loading conditions. The loading...
  5. 020100

    ASME section VIII division II

    Many thanks for your great input, Prex and TGS4. I have a little confused here with Prex's comments. (1). I was asking about physics for how the code was developed. I think that you are talking about mechanics. I think that what you meant is that if the primary stress reaches yielding, the...
  6. 020100

    ASME section VIII division II

    My question might be too general and got no answer. I would like to be more specific. (1). What is the failure mode behind of each safety factor. such as 1.0*Sm for membrane (primary), 1.5*Sm for lcoal membrane and bending, 3*Sm for Q. Is it because the primary membrane is related to...
  7. 020100

    European Pressure Directive (PED

    TUV as notified body usally requires extensive tests and then they don't need to come witness the tests every time when you have product fabricated. You could choose different notified body and you might not need to have extensive tests at all. But the notified body different from TUV might need...
  8. 020100

    304 versus 316

    316 has better magnetic properties due to phase transformation @4.2K. It costs more (~20% more). People use more 304L these days
  9. 020100

    Scaled modal analysis?

    Hi, everyone, Even though it is "NO" in theory, I used quite often for the following reasons. (1). Quite a lot of frequency contents make very time- consuming to do harmonic anlaysis. (2). Modal analysis hard to predict very broad spectrum over 5Hz to 2000Hz due to complicated structure. It...
  10. 020100

    European Pressure Directive (PED

    There are quite a few of things you could do. The facility needs to get TUV certified (or so called HP0). And you need to certify the welder per extensive TUV specific tests (A few labs could do the tests). The cert will be renewed every year. It will add cost, no question. But it can be done.
  11. 020100

    ASME section VIII division II

    Hi, I am wondering whether anybody in the forum has experience for how to use design by analysis in ASME section VIII division II. The real question is how to select the location to use the rule for priminary, secondary and so on. Thanks LZ

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