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Recent content by Soln

  1. Soln

    Hot tapping tank shell with high liquid level

    A tank that needs hot tapping at multiple elevations has liquid level that results in hoop stress of 15,000 psi. The material is known toughness, but I'm still leery of welding on the shell with that high hoop stress. API 653 states that materials of unknown toughness shall limit hoop stress...
  2. Soln

    API 650, Annex E, E.6.2.2.3- Allowable Longitudinal Stress

    Great tip JStephen. I see the max allowable compressive stress for longitudinal loads only, is 1.8X10^6t/R, and for longitudinal an circumferential compression stress, it's 10^6t/R. Still curious where the large 10^6 coefficient is derived from? Thanks again!
  3. Soln

    API 650, Annex E, E.6.2.2.3- Allowable Longitudinal Stress

    I'm trying to better understand the equations in E.6.2.2.3. Can someone help me understand what's in the coefficient 10^6 of the allowable stress equation 10^6*t/D? I think it must be some derivation possibly including 1.33FY/(12D/t) (1.33 for ASD times yield stress, all divided by D/t)...
  4. Soln

    Storage Tank Stiffener ring location (Inside or outside)

    That seems plausible- maybe a constructability issue. With the stiffener inside, they were able to run equipment in the gap between tanks...?
  5. Soln

    hi i am doing pqr for astm 516 g

    API 650 12th Ed, 9.2.2.3- For materials to be used at design metal temps less than 10*C, the qualification of the procedure for vertical shell welds shall include impact testing. Hope this helps-
  6. Soln

    Welding schedule

    For guidance, check API 650 12th Ed, Section 5.1.3. For group I, II, and III (A283 is Group I), manual welds greater than 6 mm shall be multipass, and semi-automatic welds greater than 10 mm shall be multipass. So you need to consider if you are welding using manual process such as SMAW? OR...
  7. Soln

    Cable Suspended IFR

    IFR- can you suggest a reference for hand calculating the stress on the roof due to the pointload?
  8. Soln

    ASME Section IX WPS Thickness Range

    I see... the thickness limits, indicated as a supplementary variable in Table 255 reference 403.6. The supplementary variable come into play when impact testing is required. Otherwise the qualified ranges are taken from Tables 451. Thank you for your help.
  9. Soln

    ASME Section IX WPS Thickness Range

    Thanks for getting back to me. Where does it specify that 403.6 is relative to impact testing? I'm sure it's right there, I just can't see it. I do require impact testing. Is section 403 related to impact testing? Because I have impact testing, does the combination of 403.2, and 403.6 mean...
  10. Soln

    ASME Section IX WPS Thickness Range

    I'm confused by the ASME IX, 403.2, "the max thickness qualified is the thickness of the coupon", and 403.6, "the minimum base metal is T/2 when T<1/4".. Compare that to the table 451.2, where a coupon over 3/8 is qualified for thickness range from 3/16 - 2T. I want to develop a WPS that...
  11. Soln

    Sand bed, vs concrete inside ringwall foundation?

    I will appreciate receiving experienced perspective with tanks resting on sand (inside the ringwall), vs resting on concrete. Have you seen many tanks that rest on concrete (inside the ringwall)? Are you aware of any benefits of using one, or the other? Sand may help with drainage. Sloped...
  12. Soln

    Full Contact IFR

    DISCUS?
  13. Soln

    New tank bottom, hydrostatic test?

    It's possible with the acceptance of the owner according to the conditions of 12.3.2. Hydrogen test is a common substitute if water is an issue.
  14. Soln

    replacing the 12&quot; RFSO flange

    Weld neck is a tricky weld to make in the field, and requires x-ray. I would gouge the damaged flange off, and replace with RFSO. Is there concern with heat affected zone HAZ? Remove 1/2" past weld from the neck- there will likely still be plenty of projection. Does the job- economical-
  15. Soln

    Column Seal Material by Application

    Anyone have a chart that suggests column seal material by application? I have a Naptha storage tank with internal floating roof. I'm looking for guidance in replacing the column seal material. I had a recommendation to use teflon, but I think teflon is too stiff. I appreciate if anyone is...
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