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  • Users: TXTank
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  1. TXTank

    API 620 conical roof thickness calculation questions

    Should the roof live load and snow load be included in the roof weight when calculating the unit force T1 (equation 8 of 5.10.2.5)? For example, suppose I have a tank with a 100 foot diameter tank with conical roof with alpha = 80, plate density = 0.2833, and internal pressure of 0.1 psi. The...
  2. TXTank

    API 620 umbrella roof design

    Are umbrella roofs allowed for API 620 and, if so, what equations should be used in their design?
  3. TXTank

    API 650: Are rafter supported roofs considered self-supporting?

    Should API 650 section V.7.2 be applied if the roof has rafters but no columns? My vote is no, but a senior engineer here says the opposite. Any thoughts or clarification would be appreciated.
  4. TXTank

    API 620 Footnote 16

    In section 5 of API 620 there are several references to Footnote 16 (e.g. "NOTE: See Footnote 16 for information applicable to Equation (10)" on page 5-21). The only Footnote 16 I can find is in section 4 on page 4-10: "If better grades of bolts are used, higher bolt stress values are not...
  5. TXTank

    API 650 12th Ed. Addendum 1 update to S.3.6.6

    Addendum 1, which came out this September, updated section S.3.6.6 so that the old M.6 requirement to modify according to temperature the yield stress used in calculating the unstiffened shell height for stainless steels is no longer required. Section X.3.7.2 (duplex steels) was updated to...
  6. TXTank

    Warping Constant formula for channels

    I am trying to find a good formula for Warping Constant for C channel sections. This formula will be used in conjunction with AISC 360-10 section F2. In another thread (thread723-206373) I saw a reference to xcalcs.com where a formula is given along with sample results. However, I have yet to be...

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