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  • Users: tigny
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  1. tigny

    repair of scratch on sealing surface of proprietary flanged assembly

    Dear TGS4, This makes sense, thank you for clarifying this matter. Best regards, Cyril
  2. tigny

    repair of scratch on sealing surface of proprietary flanged assembly

    Hi, after UG-99 hydrostatic leak testing [and supplemental gas leak testing (sniffer)], a pressure vessel has the first sealing surface of the connections used for pressure test exposed during dismantling. There are scratches on such faces happening at this moment. After repair of those faces...
  3. tigny

    Boundary condition on a burst pressure test

    Hello, in the vein of 3-2-1; and on order to reduce the calculation cost, if there are symmetry planes on your box, maybe you could use half or a quarter of your model, therefore some of the rigid modes would be constrained. You would only need to constrain the axial displacement at the capped...
  4. tigny

    Raised face height on flanges

    Hello SnTMan, r6155, jt1234, LittleInch, thank you for your diverse anwsers to my questions. best regards
  5. tigny

    Raised face height on flanges

    Hello, In the following flanges Standards/Norms, the raised face height is presented or tabulated. [ol 1] In ASME standards, the higher the pressure/temperature class, the higher the raised face height: ASME B16.5-2020 states "1,5 mm raised face regularly furnished on Classe 150 and 300...
  6. tigny

    Leakages in High pressure Urea grade nozzles, lens gaskets.

    Hello, we cannot see any lubricant around the studs/nuts on the overall view. As stated by LittleInch, ASME PCC-1-2022 give guidance on lubrication (check Figure 8.1), which doesn't seem fulfilled. We should see excess of lubricant. You may have attained you torque, but not have developped...
  7. tigny

    CAESAR II : How to include piping files with relative path ?

    Hello, did you try with a folder name without les accents? best regards
  8. tigny

    46-4 DESIGN BY ANALYSIS ASME BPVC.VIII.1

  9. tigny

    46-4 DESIGN BY ANALYSIS ASME BPVC.VIII.1

    Dear TGS4, May I try to sum-up my understanding: the wording "[...] The exemption provided in Division 2, 5.3.1.1 is applicable to weld details in Division 2, Part 4 only. There exist weld details in Division 1 that are not permitted in Division 2 [subject to the provision in 46-3(f)]; those...
  10. tigny

    46-4 DESIGN BY ANALYSIS ASME BPVC.VIII.1

    Dear @r6155, I greatly appreciate your concern, however I will restate that this illustration if for your information only: I don't want to disclose my company's drawings therefore I used this image because the general arrangement of the components is the same. I don't want to mix codes; as...
  11. tigny

    46-4 DESIGN BY ANALYSIS ASME BPVC.VIII.1

    Dear IdanPV Thank you. I understand your interpretation, so the answer to my initial question would be: there is no exception for VIII.1 components, furthermore for VIII.1 weld details not permitted in VIII.2. So 46-4(c)(2) could be rewritten as "demonstration of protection against local...
  12. tigny

    46-4 DESIGN BY ANALYSIS ASME BPVC.VIII.1

    Being a machinery housing, but pressure being the driving force for the dimensions, we prefer to use a pressure vessel code to design it.
  13. tigny

    46-4 DESIGN BY ANALYSIS ASME BPVC.VIII.1

    Dear r6155, DriveMeNuts, Cobra17, TGS4, thank you for your interaction, answers and questioning. Our design follows the ASME BPVC.VIII.1 design by rule calculations, taking into account the Reverse flange (Appendix 2), Opening (mainly UG-36, UG-37, UG-40 (fig UG-40 (a-2)) and Method of...
  14. tigny

    46-4 DESIGN BY ANALYSIS ASME BPVC.VIII.1

    Dear @r6155, dear TGS4, thank you for interest in my question and your replies. I indeed did not and do not intend to design the thickness with DbA. The dimensions have been assessed with UG of Div.1. The DbA is done as a supplement to the DbR. The DbA run is not to assess this particular...
  15. tigny

    46-4 DESIGN BY ANALYSIS ASME BPVC.VIII.1

    Hi, for an ASME BPVC.VIII.1 "Design By Rule" designed pressure vessel, we conduct a supplemental analysis along the requirements of Appendix 46, 46-4 DESIGN BY ANALYSIS (using the methods of ASME BPVC.VIII.2 Part 5). One of the components of the numerical model is a Studded pad type connection...
  16. tigny

    Same thermal conditions | stresses increase | primary plus secondary

    Hello, The following is only about the "high stress" results. if you have continuity of geometry but with materials of different Coefficients of Thermal Expansion (specifically at a weld or even at a bolted connexion), you may experience very high stresses with the same temperature throughout...
  17. tigny

    Bearing Stress - UG-23(h)

    Hi, ASME BPVC VIII.1 UG-23 MAXIMUM ALLOWABLE STRESS VALUE, chapter (h) states that the maximum bearing stress shall be limited to x time the value in SECTION II.D Would the casting factor of UG-24 CASTING apply to bearing stress too? best regards,
  18. tigny

    Single flange face alignment tolerances

    Hello, in the field of piping, EN 13480 has normative dimensional tolerance requirements for a case similar to your illustration. Please check chapter 5.6 Tolerances and ANNEX (Normative) B Dimensional tolerances for fabricated spools of EN 13480-4 Metallic industrial piping – Part 4...
  19. tigny

    MSC Nastran vs. NX Nastran in 2022

    Hi, NX NASTRAN is now called SIMCENTER NASTRAN and lots of new capabilities have been brought into it since SIEMENS has incorporated LMS/SAMTECH solver solutions into it, SAMCEF for exemple. The non linear solver for SOL601/SOL701 from external partner ADINA is phasing out/phased out and...
  20. tigny

    ASME B31.3 - flexibility formal analysis not required (clarifications)

    Hello, this part 319.4.1(c) of the code is clearly applicable only to very simple piping with only two points of fixation. Furthermore note 8 states that this method should be used with caution. In case you have more than 2 points of fixation you can go to still use 319.4.1(a) or 319.4.1(b)...

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