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How to calculate the Minimum Remaining Thickness from Soil Side Corrosion after Repairs (RTbc)on a storage tank bottom?

Dear Dhurjati Sen, your answer to my t-min Question was very helpful. Thanks, Leon Charles.

Can anyone tell me where to find instructions on how to perform an API 653 survey settlement? I would like information on setting up the laser instrument at different location around the tank and how to perform the calculations with information obtained.

S is stress values = S(dbf/in.2)

I'm having trouble with the t-min calculation for an above ground storage tank. I followed instructions in API 653, but the final answer does not look correct, see below. Tmin-? D - 28.5' G - 1.00 S - 24,900 E - .100 H - 45.9'-1 = 44.9' Tmin = 2.6(H-1)DG/SE Tmin = 2.6 x 44.9' x 28.5 x 1.00 =...