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  1. Sail_Fish

    Fatigue Analysis

    Many thanks for the explanation. I will look into the fracture mechanics approach.
  2. Sail_Fish

    Fatigue Analysis

    TGS4 - I am trying to determine the allowable number of cycles for a vessel operating under cyclic pressure fluctuations using the PD5500 method and ASME VIII method fatigue methods.. Within the PD5500 method, the constants 'm' & 'A' are given depending upon the weld class. There are two sets...
  3. Sail_Fish

    Fatigue Analysis

    Hi all, I am looking at performing some fatigue anallysis (theoretical only) and want to udnerstand the differences between the PD5500 and ASME VIII D2 method a bit more. With the PD5500 method, you are required to estimate a required number of cycles that then determines which of the S-N...
  4. Sail_Fish

    ASME VIII D2 Design Fatigue Curves.

    Hello, I am wanting to calculate allowable number of cycles of a pressure vessel (snubber) using ASME VIII D2 ANNEX 3.F DESIGN FATIGUE CURVES and have a couple of questions. Am I correct in thinking I should use the 'Smooth Bar Fatigue Curves' for the shell and the 'Welded Joint Fatigue...
  5. Sail_Fish

    Level 3 FFS Assessments FEA courses

    Hello, I want to start exploring Level 3 FFS Assessments and wanted to know if anyone can recommended any courses similar to this one in the UK? https://www.3ds.com/fileadmin/PRODUCTS/SIMULIA/PDF/training/fitness_for_service-summary.pdf
  6. Sail_Fish

    Thermal Cycling

    OK I have attached the temperature profile of the drum. Hopefully it is easy enough to understand. Green Line is the top head temperature and the blue line is the bottom head temperature. Thickness of the drum is 32mm with a total height between Tan's of 6100mm. ID is 1675mm. Heads are 2:1 Semi...
  7. Sail_Fish

    Thermal Cycling

    Yes I have temperature probes on the drum with an accurate temperature profile. Just to stress there is no issue with the drums, such as cracking etc. The question was asked because the drums operate in 'cyclic' service, albeit low frequency (they heat up, steady state and cool down over a 48...
  8. Sail_Fish

    Thermal Cycling

    Thank you for the replies. I took a look at the screening method B (5.5.2.4) and it looks as though I am interested in Steps 5 - 8. correct? In steps 5 - 7 it asks for a maximum temperature difference between to adjacent points, with the adjacent points calculated using L=2.5SQRT(Rt). Would...
  9. Sail_Fish

    Thermal Cycling

    Thank you for the replies. I took a look at the screening method B (5.5.2.4) and it looks as though I am interested in Steps 5 - 8. correct? In steps 5 - 7 it asks for a maximum temperature difference between to adjacent points, with the adjacent points calculated using L=2.5SQRT(Rt). Would...
  10. Sail_Fish

    Thermal Cycling

    Hello, I have a vessel (drier) designed to ASME VIII Div 1 that is undergoing daily temperature swings from 100F (38'C) to 380F (193'C) within half an hour. The design conditions are 260 PSIG @ 500F. Is there any guidance on allowable temperature swings before you need to assess for thermal...

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