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API RP 12R1 Appendix F - Min. Thickness for Tank Elements

API RP 12R1 Appendix F - Min. Thickness for Tank Elements

API RP 12R1 Appendix F - Min. Thickness for Tank Elements

F.2.3 Step #3 versus Table F-1...huh? Am I missing something or are they poorly written?

I get the 5 times corrosion rate calculated minimum thickness that are cited in the step 3 narrative and the table but I get derailed with the bottom critical annulus (Tb1) and both shell elements (Ts1 & Ts2...). "Tmin" is cited in the narrative whereas "T" is used in the table and 0.75 has been omitted from the Ts1 calculated minimum relative to the narrative.

About the only two aspects of Appendix F that I find useful are the step #1 shell equation (same as what's in API Std. 653) and the "Absolute Minimum" column in Table F-1.

What obvious points am I missing?

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