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  1. carthago

    AXISYMMETRIC boundary conditions?

    What is the best practice to model a cylindrical storage tank , with annular plate bolted to the foundation. I want to model use the AXISYMMETRIC capabilities of ANSYS . my issues/ questions are about: Boundary conditions Fixation to the ground A small model in ANSY workbench would be very...
  2. carthago

    Using wind as an external pressure?

    While checking for secondary wind girders/ rings, the EEMUA 159 and the European code EN 14015 ( both are for storage tanks) combine in one formula the Wind (thru wind speed Vw) and the external pressure (Pv) to check buckling lengths and the need of wind girders . take care and thanks
  3. carthago

    rafter supported cone roof on ASNSY WORK BENCH

    ....ooops the other attachments take care and thankshttp://files.engineering.com/getfile.aspx?folder=be95e5bd-077e-4da2-842d-2dfc9febfd7f&file=BRACKET_max_displacment.png
  4. carthago

    rafter supported cone roof on ASNSY WORK BENCH

    I came across this problem before. And could not find something serious in the literature !! ANSYS was conducted upon client request as the tank is an existing one, and it has to be re-assessed... I used ANSYS workbench. Building an asymmetric model. I focused on Minimum Principal stress as...
  5. carthago

    Hows does Abaqus calculate the Stress Intensity Factors?

    ..just of curiosity , are you stress intensities in line with for instance with ones in API 579 ? how do they compare with published values ? ..This standards has an extensive literature regarding stress intensities and their application for fitness for service purposes. take care and thanks
  6. carthago

    Determine Vessel wall thickness and external and internal pressure resistance

    In France , for pressure vessels the CODAP or the EN is in use For storage tanks ( up to 60 mbar ) the CODRES ( Code de reservoir cylindriques VERTICAU et atmospheriques, a bit similar to EN 14015 is in use. Besides you have to satisfy the several national Laws called Decrets which stipulate...
  7. carthago

    Which software has been used for API 579 and ASME VIII

    Which software has been used for ? 1/- API 579 ( the part 2 with the examples) and 2/-ASME VIII ( he 3 booklets with the examples of division one and division 2) was it simply a text editor ? and the calculations have been made behind the "curtens" ? or is it a formal software dedicated to...
  8. carthago

    FFS-1 = API 579 latest edition (2016)

    I understood that a new edition (June 2016) has been issued ? What are the latest changes ? topics ? (e.g. compared to the previous edition ). Are they additions ? and or changes or amendments ? or even some re-writing of course the introduction in the new edition gives a very quick...
  9. carthago

    Pipe lift off in dynamic analysis

    I always understood that Caesar is a linear program. To this date and in my knowledge Caesar has no Non-Linear capabilities So for dynamic it will: 1/- make all + Y supportS Y (e.g closed in both directions. 2/- make all gaps equal to Zero. So after modifying the supports following some...
  10. carthago

    supported cone roof

    Sajk14 thank you for answer question: are there special calculations to do ..on the shell to take into account the loads coming from the roof and the rafters under which the roof plates are welded? If you can insert a typical sketch or drawing regarding this type of connection thanks again...
  11. carthago

    supported cone roof

    case: Conical cone roof with supporting structure (rafters connected to in inner ring, no column). Due to corrosive product, vapor inside the tank above the liquid level, the rafter are located OUTSIDE the roof. Rafter are welded to the roof. Question: how is the outer part of the rafter shall...
  12. carthago

    Pontoon roof / deck for a floating roof

    DSB123 ..and other..sorry . correction: book "Guide to Storage Tanks and Equipment" the authors are Bob Garner and Bob Long take care and thanks
  13. carthago

    Pontoon roof / deck for a floating roof

    see thread809-316272 there is a book "Guide to Storage Tanks and Equipment" the authors are Bob Langer and Bob Long , you can get it from Amazone or from this site: http://www.ais-engineering-books.com/books/pc/viewPrd.asp?idproduct=851&idcategory=6#details this book contains an example on...
  14. carthago

    API 650 Roof - Uplift Pressures

    to IFRs ..and others: so why is this uplift story is still included in the Code ? why it is there anyway ? Have we ever had a "code case in regarding the up-lift in API650" ..what was the answer of the committee ? why do not we have this issue of up lift with vessels..etc.. of course many...
  15. carthago

    EN and DIN materials of piping fittings and forgings ?

    What are the equivalent materials in EN , DIN of A 106 gr B A 333 gr. 6 A 105 A 350 LFE A 234 WPB .. What are the standard wall thickness ? Thanks a lot take care and thanks
  16. carthago

    Tubesheet Calcs

    ..New UHX calculations methodology in ASME VIII should at the end match the EN 13445 -Part 3 of the european code ..which is the same as for instance the french Code CODAP... Try a search on Google and find = francis OSWEILLER. see also attachment. This defines the assumptions and backround of...
  17. carthago

    May as-measured thickness be used in Code calcs?

    ..suggest to use API 579,..you can use the measured thickness and even used averaged values..but keep in mind the remaining thickness
  18. carthago

    S&T design & mean metal temps: short cut?

    ..Guys.. Could you elaborate a bit more about this rule of thumb an exemple or something from the basic litterature are welcome. thanks
  19. carthago

    S&T design & mean metal temps: short cut?

    ..And undrstood from Bigtaljk that he needs the means metal temperature for stress , strength and thickness calculstions as per ASME VIII, div.1 , UHX chapter.. a mechanical would have seldom a process data sheet with mean temperature,..most of the time he has the operating temperature and...
  20. carthago

    questions regarding repair =annular ring of a new bottom

    we are intending to repare an API 650 storage tank. The old tank bottom is leaking and the owner wants to add a second new bottom located say 150 mm from the old one. The old bottom will be lined , a concrete or sand will fill in the space between the 2 bottoms. we will add also means at this...

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