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Recent content by zjliang

  1. zjliang

    The maximum plate thickness 45mm

    Thanks guys. Yes, two tanks might be a better option under the limit. However, my point here is about the limit set in the API 650, is it a strength issue or toughness concern? Any insights?
  2. zjliang

    The maximum plate thickness 45mm

    Yes, it is. For the given pump suction head and working capacity, the tank has been sized to 34m Dia X 55m H, with the high S.G and corrosion allowance, the wall thickness at the bottom course would be 1.96". Considering the small ratio of D/H, the variable-Design-Point method would not give a...
  3. zjliang

    The maximum plate thickness 45mm

    Considering the low design metal temperature and cost, CSA G40.21 Grade 350 WT has been specified. ALso the allowable stress has been elevated according to section 5.6.2.1 and 5.6.2.2. That is why i am questioning the limit ... Thanks.
  4. zjliang

    The maximum plate thickness 45mm

    Recently when sizing a storage tank, found that the required thickness will be 51mm (2"), over the limit 45mm (1-3/4") thick as set in section 4.2.1.4 of API 650. The question is whether the maximum plate thickness 45mm is mandatory? If not, what additional requirements? If so, what is the...
  5. zjliang

    What does that mean, "No Land and with 3/16" Gap"

    Thanks a lot for your guys' quick response. :)
  6. zjliang

    What does that mean, "No Land and with 3/16" Gap"

    Hey Folks, What does that mean when vendor mentioned "No Land and with 3/16" Gap" to describe the long seam preparation? Thanks, A Novice
  7. zjliang

    RT of category D butt welds per UW-11(a)

    Sorry, wrong click and not finished yet. UW11(a)(2),(4) and (5b) are related to BW on nozzles. So I think if FULL RT (specially RT-1) is specified, BW on large nozzles shall be fully RT. Comments? Thanks, guys.
  8. zjliang

    RT of category D butt welds per UW-11(a)

    Hi Folks, As stated in UW11 (a), the FULL RT is specifed for different applications, however, I have some confusion regarding the nozzle. If specified Full RT, does that mean only for vessel shell and head, or should we applied to the BW on nozzles larger than NPS 10", like Category-A long...
  9. zjliang

    Mean stress effects on fatigue, ASME section III NB3200

    Yes, the mean stress has been considered in the fatigue curves of different materials (See the notes). So, no need to shift the curve or play with the Goodman chart any more. Thx.
  10. zjliang

    VT Criteria

    Hi All, Where can I find the exact requirement for the VT criteria in the Code? I checked Sec VIII, Div 1, Sec V and Sec IX, seems there is NO clear criteria for the visual examination. I mean that if there is quantitative requirements for the imperfection on the welds/seams such as undercut...
  11. zjliang

    MAWP requirement

    Thanks for your comments and especially the good insights in those two old threads. Cheers.
  12. zjliang

    MAWP requirement

    Hey folks, Sometimes we noticed that the requirement of the MAWP limited by shells or heads instead of discontinuities like nozzles is stated either explicitely or indirectly. What do you guys think of it? Please present whatever your thoughts from experiences. Thanks in advance,
  13. zjliang

    fatigue analysis on sa-414 g

    nhtien & hjulien, Firstly, I think SA-414 Gr.G shall be a ASME material, and I did find it from the table. Secondly, if design based on stress analysis will be used to evaluate fatigue, please remember Div 2 allowable shall apply. So, even though you could not find the Sm for some materials...
  14. zjliang

    FCAW for vessel welding

    I got the same unfavorable opinions on FCAW in field vessel welding from our clients but there is no exact explaination. Now from your guys' expert post, I learned a lot. Thanks.
  15. zjliang

    Integral type of reinforcing pad

    My understanding is that intergral or self-reinforced nozzles are most often used in cyclic services. The major reason is less discontinuties and fillet welds etc, which always introduce the higher SCF and peak stress. In addition to the forgings, insert-plate type nozzles are used very often...
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