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  1. mancini

    API 650 AP S x EN 14015 STAINLESS STEEL ATMOSPHERIC TANKS - SHELL MINIMAL THICKNESS FOR CONSTRUCTION

    Hi everybody, In our projects of small diameter atmospheric tanks (Diameter < 4000mm x Height < 4000 mm) supplied in one piece ("complete shop assembly and delivery to the installation site in one piece"), stainless steel A240 TP 304L, we have used the API 650 code, from the code in the Annex...
  2. mancini

    Tube to tubesheet rolling expansion at low temperature (-30C)

    Thanks a lot by your suggestions.
  3. mancini

    Tube to tubesheet rolling expansion at low temperature (-30C)

    We have a project where will be necessary to be executed tubes rolling expansion at site in an environment with temperatures about -30C, we have executed plenty of tube to tubesheet expansion at site but not at this low temperatures. The tubes and tubesheets are materials 304L, so probably no...
  4. mancini

    ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD

    Hi gr2vessel and everybody, You understood correctly what we have faiced with our supplier, they have used in some sections the "inclined" welds in order to minimize the amount of material to be used (in the case were cone section from big equipment), so they asked us the approval of their...
  5. mancini

    ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD

    Hi stanweld and SnTMan that is the point, besides there is the information in ASME where it is informed that it is possible to use the spiral weld for shell welded joints, in almost 30 years working with different pressure vessels design codes, I have also never seem this similar kind of...
  6. mancini

    ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD

    No, I'm talking about the shell main weld (see UW-3)
  7. mancini

    ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD

    We have a pressure vessel supplier which asked us to use "inclined welds" in some shell elements from a pressure vessel, so in accordance their understanding as in ASME UW-3(a) it is informed that a spiral weld (type A) on the shell of a pressure vessel can be used, please may you inform your...
  8. mancini

    API 650 ONLINE TRAINING

    Hi, Does anyone have information about API 650 online training? I have tried to find it but no positive results. If somebody know where I can find a set of slides with information from API 650 information for training, mainly about atmospheric tanks design, construction,... also will help a...
  9. mancini

    Vertical Atmospheric Tower API,....

    Hello Joe and Patrik, For additional information the stress which is governing the thickness at the lower shell is the compressive stress. As you had mention, the big differences are probably because we have used ASME Code, so now we will try the API 620. Regarding the other options to make...
  10. mancini

    Vertical Atmospheric Tower API,....

    Hi, Thanks by the posts, This is a low density tank (1,1), in fact the problem which we have faced is the total load at lower shell (added to moment from wind load), these loads (mainly due to wind moment and stress concentrations) have increased the thickness at lower shell, so with the...
  11. mancini

    Vertical Atmospheric Tower API,....

    May anyone give me a recommendation to the Code for design / fabrication /... to be used for a vertical tower (dia 7 m lower cylinder x with 7m height / transition from dia 7 m to dia 14 m / upper cylinder with dia 14 m and 40m height), atmospheric equipment (only liquid up to the top), design...
  12. mancini

    API 650 Tanks with internal concrete lining

    When it is used an internal concrete lining (for instance 100 mm thickness), is there any reference for carbon steel atmospheric tanks’ shell and bottom "local deviations from theoretical shape" or tank shell out of roundness tolerances? I know that in API 650 there are some tolerances for...
  13. mancini

    NR13 Pressure Vessel Code

    Hi MickeyL, In accordance with the NR-13 rules, all the pressure vessels where Pressure(kpa) x Volume (m3) > 8 must be included in the NR-13 pressure vessels classification. If you need I have an English version. Mancini
  14. mancini

    API 650 - APPENDIX M - MAXIMUM OPERATING TEMPERATURE

    Thank you Steve, so I understand that it is correct to consider: 1) Maximum operation temperature the temperature that will occur on the normal operation condition and in this case is necessary to use Appendix M (usual operation condition). But, 2) Design temperature: a process extreme...
  15. mancini

    API 650 - APPENDIX S - JOINT EFFICIENCY

    If I have to design a tank in accordance with API 650 , APPENDIX S (stainless steel tank),is it correct to consider different joint efficiencies (E) to be applied in the same shell but different shell elevations? For instance, in order to reduce the shell thickness using E=1.0 on the lower part...
  16. mancini

    API 650 - APPENDIX M - MAXIMUM OPERATING TEMPERATURE

    I have worked in an API 650 tank design, carbon steel ASTM A 36 and the maximum normal fluid operation temperature is 194 F (90 C). Is it a must to consider the appendix M from API 650 if the design temperature is 230 F (110 C)? This design temperature, in our case, is not a usual...
  17. mancini

    Impact test exemptions for Duplex Stainless

    I have been involved in the same problem informed by Arcer, does anyone have any information if really it is necessary to have impact tests for the base material and welding procedure if it is used a duplex steel and the MDMT is 0 deg and thickness is more than 3/8" used in a pressure vessel, as...
  18. mancini

    PV plates rolling direction

    Thanks for all the answers. Do you think, that if it is used the austenitic SS shell materials, is it recommended to request the plates raw materials with tension tests in the direction transverse of final rolling and also a bend test with the bending axis parallel to the plate rolling...
  19. mancini

    PV plates rolling direction

    I know that it is not usual, but may somebody inform if there is any restriction in ASME Sec VIII Div 1 or other Sections to manufacture a PV with the direction of the plate conformation executated during the fabrication, parallel to the plate rolling direction (as received from the mill)? In...
  20. mancini

    Pressure vessels manufactured from UNS S41003 (3Cr12)

    OK, Thanks metengr and unclesyd.

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