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  • Users: tigny
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  1. 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...
  2. 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...
  3. 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...
  4. 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,
  5. tigny

    ASME.BPVC.VIII.2-2019 choice of fatigue curves for Method B screening

    In ASME.BPVC.VIII.2, 3.F.1.2 there are the following qualifications, when selecting fatigue curves to apply to materials: 1) Do 17Cr-4Ni-4Cu, or 13Cr-4Ni composed steels fall under "High Tensile Strength Steels" (as stated in 3-F.1.2 a)) or "Nickel–Chromium–Iron" (as stated in 3-F.1.2 b))? Any...
  6. tigny

    Yield strength of SA/EN 10028-7 in ASME.BVPC.II.D TABLE not in line with EN 10028-7?

    Hello, browsing through Table Y-1 of ASME.BPVC.II.D-2019, it seems that Yield Strength values of plate material SA/EN 10028-7 X5CrNi18-10 do not correspond to ASME.BPVC.II.A SA/EN 10028-7 X5CrNi18-10 reference. In https://files.asme.org/STLLC/12195.pdf it is stated that the Committee uses...
  7. tigny

    uniaxial strain limit - Table 5.7 ASME.BPVC.VIII.2 Chapter 5

    hi, regarding 5.3.3 Protection against local failure, Elastic-plastic analysis - Local Strain Limit, there are reference parameters εLu, m2 and αsl to be selected in Table 5.7 depending on materials. Table 5.7 lists Ferritic steel; Stainless steel and Nickel based Alloys; Duplex stainless...
  8. tigny

    API RP 686 Figure B.4 Piping alignement datasheet

    Hi, On the schemes of the API RP 686-2009, Figure B.4-Piping Alignement Datasheet, when checking if flanges are parallel according to 4.6.3, shall we understand the "difference between high & low reading" as: MAX[(1.-5.); (2.-6.);(3.-7.);(4.-8.)] (i.e. diametral differences) or...
  9. tigny

    Aluminum alloys SB-26 A03506 - appendix 7?

    Hi, for a pressure vessel component made of ASME SB-26 A03506 T6 (casting), is APPENDIX 7 (as referred to in UG-24(b) for castings) applicable? When considering the title of APPENDIX 7, "EXAMINATION OF STEEL CASTINGS", I would say "no it isn't". Any input? best regards,
  10. tigny

    ASME.BPVC.VIII.1 fig UG-37.1 F correction factor.

    Hello, in an opening reinforcement calculation, according to ASME.BPVC.VIII.1 fig UG-37.1, for a circular opening in a cylindrical shell, without reinforcing element added, when checking the 90° theta to longitudinal axis location, is it enough to modify the correction factor F (value become...
  11. tigny

    ASME B31.3-2014 Pipe A321 S31254

    Hello, In ASME B31.3-2014 Table A-1, page 180, the "Notes" for the materials UNS no. S31254 (20Cr-18Ni-6Mo austenitic stainless steel) contains reference (8). This note (8) to Table A-1 seems to pertain to carbon steels, low strength bolting and carbon steel bolting rather than austenitic...
  12. tigny

    Elbolets and MSS SP97?

    Hi, I read in thread378-366796 that MSS SP-97-2012: [highlight #729FCF]"Elbolets are incorporatd in the latest edition of MSS SP-97, which is, as we know, 'part of B31.3s scope' by reference in table 326.1."[/highlight]? [ponder]: the only thing I can read in this Standard Practice is, SP-97...
  13. tigny

    dimensions for bolt ASME VIII-2 Chap 5.7

    Hi, for ASME SECTION VIII DIVISION 2, Chapter 5.7 SUPPLEMENTAL REQUIREMENTS FOR BOLTS, it is requested to check "actual service stress in bolts". In this code, bolts are designed from their root area in design by formula (it is a pre-requisite to FEA calc, see 5.7.1 (a)), which is less than...
  14. tigny

    bolt spacing correction; bolted flat unstayed head

    In ASME VIII-1, 2-6, there is a provision for a bolt spacing correction factor Bsc to be applied to flange moment in the case of lethal service or when specified. When calculating a bolted flat unstayed head (UG-34; according to Fig. UG-34 (j) or (k)) to close the flanged joint, there seems to...
  15. tigny

    casting quality factor, ASME VIII-2 and ASME II-D, Table 5A

    Hi, in ASME II part D, table 1A for casting material SA-216 WCC, note G1 requests the use of a casting quality factor according to ASME VIII-1 UG-24 to be applied. ASME II part D, table 5A, for ASME VIII-2 application, doesn't specify the use of such a casting quality factor. Is it related to...
  16. tigny

    UG-30(e) radial loads units

    Hi, in UG-30 Attachment of stiffening ring, (e) Strength of Attachment Welds, (1) The radial pressure load from shell, [highlight #FF99FF]lb/in.[/highlight], is equal to PLs. (2) The radial shear load is equal to 0.01PLsDo. Shall I assume the factor 0.01 is valid only for US Customary units...
  17. tigny

    UG-27(g), UW-9(c) tapered transitions; flange design.

    Hi, In the UG-27 Thickness of shells under internal pressure (g), any reduction in thickness within a shell course [...] shall be in accordance with UW-9. Then UW-9(c) tapered transitions, minimum length of taper is required where offset is higher than (1/4 the thickness of smaller section or...
  18. tigny

    cross sectional area of bolts - metric

    Hi, I would like to know where the values of bolt root area in COMPRESS come from. Are they based on iso bolting dimensions calculated with ASME formulas? yours truly, tigny
  19. tigny

    ASME SECTION VIII DIVISION 1 UG-32(e) 1-4(c) formed heads

    Hi, In UG-32(e) Torispherical Heads, torispherical heads made of materials having UTS >= 70,000PSI (500 MPa) shall be designed with S = 20,000 PSI (150 MPa) at room temperature and reduced in proportion to design temperature. The rounding in MPa seems appropriate according to nonmandatory...
  20. tigny

    requirement for bolt - hydraulic test case-ASME VIII-2

    Hi, I'm in the process of evaluating the effect of a 4 time design pressure hydrostatic test on an equipment (japanese HPGSL requirement) I am wondering which are the allowable stresses in bolts during test for an ASME VIII div. 2 part 5 calculation. Chapt. 5.7.2 gives service stress...

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