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  1. Raul Villalba

    Electric boiler according to ASME VIII-1

    Sorry for the intrusion, but I don't quite see it clearly According to my interpretation of ASME VIII-1 U-1(g), if it has an immersed heating element and the steam is used externally, it is considered an unfired steam boiler, see interpretation detail. Therefore, the sentence "Unfired steam...
  2. Raul Villalba

    Mistake Identified in ASME BPVC.VIII.1-2023 Appendix 41 Example

    Hello Engineers! I've noticed a mistake in ASME BPVC.VIII.1-2023 Appendix 41 that might cause confusion affecting results in Example 41-10 Step 2 (h/p calculation) and subsequently impacting: Step 2: Correct h/p is 1.62/0.98425 = 1.6459 psi, but due to the error, it's 1.519. Step 11: Correct...
  3. Raul Villalba

    Bending stress classification - corner of double wall rectangular vessel

    ASME VIII-1 Appendix 13 is limited to single-wall vessels acc. to 13-1(a) & 13-2. I would only use App. 13 to estimate the thickness before using U-2(g). Maybe you wanted to refer to the same thing.
  4. Raul Villalba

    Fillet weld fatigue assessment acc. to VIII-2 5.5.5

    The equipment is a parallelepipedal double chamber pressure vessel which is assessed with ASME VIII-1 through App 46 - Design by Analysis (Div 2 Part 5). The main loads are the chamber pressure, jacket pressure and thermal. The main material is SA-240 316L. Tmax = 150ºC. My thread involves two...
  5. Raul Villalba

    Fillet weld fatigue assessment acc. to VIII-2 5.5.5

    Hello, I have some doubts about weld modelling and stress evaluation for weld fatigue assessment of a non-symmetric loaded fillet weld acc. to ASME BPVC.VIII.2-2021 5.5.5. I have created a sub-model (weld included) meshed with solid elements. I have used a stress classification line (SCL)...
  6. Raul Villalba

    ASME VIII-2 Part 5 - Use of bilinear material models for plastic verifications

    Reply to BJI You are right. With a correct linearization path Membrane+Bending range = ΔSn.k = 600 Yes, I have performed an EP ratcheting which is compliant with criteria 5.5.7.2 – step 5 – c. Total deformation of the component does not increase with cycles. Reply to TGS4 Von Mises stress...
  7. Raul Villalba

    ASME VIII-2 Part 5 - Use of bilinear material models for plastic verifications

    I have excluded peak component with a classification path in the direction of the principal component S1 (>>S2) since cross section path classification is not well defined. M+B is around 500 MPa > Sps = 345 MPa. Elastic linear analysis Stress ranges and linearization path. Sub-model with...
  8. Raul Villalba

    ASME VIII-2 Part 5 - Use of bilinear material models for plastic verifications

    Thank you for your answer. With respect to fatigue assessment, there is a notched zone under multiaxial non-proportional load with plastification. The local zone and its cross section do not comply with criteria 5.5.6.2 needed for values of correction factor Ke.k greater than 1, according to...
  9. Raul Villalba

    ASME VIII-2 Part 5 - Use of bilinear material models for plastic verifications

    Dear All I am assessing a component following ASME VIII-2 Part 5. I have a region (rounded well meshed corner) with high stress concentrations leading to localized plastification. Material model of each verification: - Plastic collapse: limit load 5.2.3 elastic perfectly plastic bilinear...
  10. Raul Villalba

    ASME VIII-1 Appendix-46 Materials

    Dear All I am assessing a component following ASME VIII-2 Part 5 according to ASME VIII-1 Appendix 46 as it can not be verified with design by rule procedures of ASME VIII-1. For this component, do I need to consider only the allowed materials in ASME VIII-2 or can I use other allowed...

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