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Recent content by mrpsi

  1. mrpsi

    Qualifying A4-70 bolt per ASME B31.3

    Good morning EdStainless, thank you for responding. Yes, you are right that it is "lightly strain hardened". I noticed in ISO3506-1 there are other versions that are stronger, so then they would have more strain hardening. So, per ASME B31.3 then, whether it is "lightly strain hardend" or...
  2. mrpsi

    Qualifying A4-70 bolt per ASME B31.3

    Hello, I need to qualify a Stainless Steel A4-70 bolt (size M10) per ASME B31.3. Per ISO3506-1, it is described as "Soft or Work Hardened" in Figure 1. Per ISO3506-1 Table 2, Tensile (UTS) = 700 MPa = 101.5 KSI & Yield(YS) = 450 MPa = 65.3 KSI Question: how do we know whether it qualifies...
  3. mrpsi

    CRN

    Hello Reichertc, Wow, adding to B16.34/B16.5 sounds like a major undertaking and something that I've never envisioned. However "in order to entirely bypass ABSA..." is not entirely correct. For a fitting complying with B16.34, ABSA will still want to verify that the manufacturer's quality...
  4. mrpsi

    CRN

    Valvespro, For Detailed engineering calculations, you can either try to apply classical pipe-shell and nozzle area replacement calculations or the most robust method is FEA. One advantage that FEA has over burst testing is that you can cover multiple materials by running the weakest material...
  5. mrpsi

    CRN certification review time?

    Hello Valvenator, Sorry I missed this posting, and likely since this is June you're already in the thick of the CRN waiting process. Perhaps this can help others. A few points: A) Initial wait times will vary by jurisdiction. -TSSA's (Ontario) normal service will be 3-4 weeks before your...
  6. mrpsi

    Cosmos & Multiple core

    Hello, this is an interesting question. With a quad-core, Cosmos will run at 68% of all cores, during the solving (not the meshing), using the FFEPlus solver. For the Direct Sparse, it hogs the RAM and runs at 100%. See brief discussion on scribd. There isn't much concrete information "out...
  7. mrpsi

    Lap Joint dimensions >24in ?

    SnTMan & doct9960, Thanks for your responses. Regarding points that have been raised: -Sensitivity: Per Appendix-2, Fig.2-4 (1), for Lap-Joint flanges at seating, the location of G, and thus the moment arms hG & hT, are taken to be at the midpoint between Lap OD and Flange bore (the contact...
  8. mrpsi

    Lap Joint dimensions >24in ?

    Hello, Are there any published Standards or "industry practices" that govern the size of laps (stub-ends) for large diameter (>24") lap joint flanges. ASME B16.9 covers pipe sizes up to 24", but beyond that I can't find any guidance other than extrapolating the B16.9 sizes. I'm running...
  9. mrpsi

    ANSI B16.47 flange connection

    hello Mboundi, You need to purchase a large-diameter lap joint flange that has been designed using Appendix 2 rules. I'm sure that there are various suppliers whom you can use for this, but here's a fabricator whom you can contact: www.proflange.com. I don't think they sell direct, but will...
  10. mrpsi

    Opening in skirt through skirt weld

    Sometimes these difficult customers are placated by a colorful yet simple FEA, showing that there is no cause for concern. The results would be interpreted per ASME VIII-2. The allowable strengths would correspond to VIII-1 (IID-Table 1A), imposing the applicable weld efficiency. The applied...
  11. mrpsi

    Differance between B31.1 and Sec. 8

    There are many differences between VIII-1 & B31.1: -B31.1 is closer to B31.3 than VIII-1, as befits the component being designed and fabricated. -Calculation equations are different (such as shells) -Material allowable stresses are a bit different. -Inspection requirements differ to name a few.
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