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  • Users: MikeG7
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  1. MikeG7

    TEMA RCB-8 Flexible Shell Element

    Good day all. I am puzzled by the applied loadings used to check the stress in the flexible shell element (FSE) of a thick joint per "TEMA 9th Ed. 2007". I have followed the procedure to determine the equivalent pressure due to expansion, equivalent shell-side pressure and tube-side pressure...
  2. MikeG7

    Bottom sketch plate width per API-650 Paragraph 5.4

    Hi All, Paragraph 5.4 from API-650 says that the minimum width of sketch plates should not be less than 1800 mm unless purchaser agrees. For my particular application, I am using 2m wide plates, 6m long. The tank is 7m inside diameter. For the center plate on the bottom I use the full 6m long...
  3. MikeG7

    API-650 Uplift Load Cases Table 5.21

    Hi All In the Table 5.21, for uplift load cases, it is written for W1 and W2 definition: - W1 = is the corroded weight of the roof plates plus the corroded weight of the shell and any other corroded permanent attachments acting on the shell W2 = is the corroded weight of the shell and any...
  4. MikeG7

    AWWA D103 TANK SEISMIC DESIGN FACTORS

    Hi All Reference tank design for seismic to AWWA D103 standard: I'm a bit puzzled trying to understand the wording included in the above standard under Section 14: Seismic Design. It says: "The design design seismic forces have been reduced by a factor of 1.4 and shall be used with the...
  5. MikeG7

    Skirt material for column

    Is it permissible to use structural grade material for skirts for ASME VIII Div.1 equipment? Quoting UG-4(b) Material for nonpressure parts, such as skirts, supports, baffles, lugs, clips, and extended heat transfer surfaces, need not conform to the specifications for the material to which they...
  6. MikeG7

    Process columns - vortex shedding

    Hello On tall process columns such as we have to design approx. 120 ft tall, in the order of 8 to 10 ft diameter, insulated 2" with a number (approx 5 to 7) access platforms with ladders for manway access as well as a large pipe going along the length of the column to the top nozzle, is vortex...
  7. MikeG7

    Tubesheet hole tolerance and size per ASME

    Is there any restrictions or roles for how close fitting a tube is in a tube sheet that is to be welded? For clarification, tubesheet design per ASME VIII D1 l, tube thickness 1.2 mm Fabricator wants to cut holes bt lazer or similar process but is concerned that some ASME requirements are in...
  8. MikeG7

    Sight glass - special design per ASME VIII Div 1

    Hi All Is there any advice how to go about the design of a custom inpsection nozzle with a sight glass. The glass is sealed with a gasket . The picture shows a similar item to the one in question. The only difference is this one has few bolts keeping the glass cover in place. The one I want to...
  9. MikeG7

    Pressure vessel to ASME VIII Div 1 with sanitary fittings

    Good day all I have found some related posts on the forums, partially they address that sanitary fittings made to A270 do not fulfil the requirements for ASME VIII Div 1 since there are no tensile testing done. However, other posts refer to ASME BPE fittings with burst test data or some ratings...
  10. MikeG7

    Intermediate stiffening rings for storage tanks

    Hi All I am working with a fabricator who prefers the use of rectangular section stiffeners made from plate. My question is that this is not shown on Figure 5.24—Typical Stiffening-ring Sections for Tank Shells . This shows bent up sections and angles. Is this acceptable to use this type of...
  11. MikeG7

    Silo bracing

    Hi All, see attached photograph What is the logic of bracing back to the cone on this silo? We have had some discussions and it seems that it is to limit the unbraced length of the leg in the weak direction? Any...
  12. MikeG7

    Bracing design for silo

    Hi. When is it appropriate to design X bracing for compression? Some silo bracing are pinned at the center, this would suggest they are designed to reduce the effective length for compression? Mikeg7
  13. MikeG7

    Silo design using FEA - applying loads to steel silo

    I am designing a silo for limestone and am doing an FEA using the variable pressure in the barrel and the conical hopper along with the values of wall friction angle, internal angle, bulk density, hopper angle etc. according to the pressure distribution methods described in relevant Codes(e.g...
  14. MikeG7

    Frame for lifting

    I am trying to design a frame for lifting a boat out of the water in Risa 3d. The frame is in the horizontal and is simply a rectangle frame at each corner is a plate which the lifting chains attach to (i.e a single lift point ) and straps go below the boat's hull. How would I put boundary...
  15. MikeG7

    Cone to shell junction stresses

    Hi I was wondering if anyone can shed some light on the concept of the stresses at the intersection of the shell and cone? My question stems from an observation that flatter the cone end, the greater the discontinuity (and stress): when the half apex angle is less than 30 degrees, we don't check...
  16. MikeG7

    Lifting Trunnions

    Not sure if this is the best location in the forum to post this question: The WRC-107 analysis done for a lifting trunnion assumes that the trunnion is connected to the shell and calculates the stress in the shell and in the pad if a pad is used. I have a situation where I want to weld the...
  17. MikeG7

    Brittle Fracture assessment

    I am asked to evaluate an existing vessel that has seem many years of service for brittle fracture. The minimum design metal temperature is not changing. I am not sure if it is required to be done because I have researched this topic a bit and it is advised in API-653 (5.2.2) that brittle...
  18. MikeG7

    Minimum nozzle thickness API 650

    Does table 5-6a define the MINIMUM wall thickness for nozzles per API-650?
  19. MikeG7

    UHX Tubesheet thickness

    Hi. The tubesheet calculation in Part UHX determines the thickness to be sufficient based on the pressure, temperature and other loadings. My question is that I have come across a statement in PD 5500 if anyone is familiar with the BS codes that says that for expanded tubes the thickness should...
  20. MikeG7

    Equivalent longitudinal weld efficiency per ASME VIII Div.1

    I am reading a "Classic BULLETIN Article" that appeared on the National Board website at https://www.nationalboard.org/PrintPage.aspx?NewsPageID=144 In one of the questions and answers, someone asked how to calculate the value of "E" for use in the UG-27 formula where there are different welds...

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