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J.M.Equipment Co.Inc.,Facility(11754), Used Oil Tank,22§CCR 66265.192&STI-SP001,November 2019 <br /> A.1 Shell Service Life Evaluation <br /> The maximum inspection intervals are determined by the most restrictive shell course in regard to the remaining life and the corrosion <br /> rate calculations for each shell course using the following formulas: <br /> Lr = <br /> tact—tmin tprev—tact Itact— tmin I _ tact— tmin <br /> CC Cr = AY ut = 2C „ 4C <br /> ' r r <br /> Maximum Minimum Previous Current <br /> Allowable Joint Acceptable Measured Measured <br /> Plate Course Stress(psi) Efficiency Thickness Thickness Thickness <br /> Course Specification Length(ft) S E (in)tmin (in)t rev (in) <br /> 1 Unknown 1 23595 1 0.047 0.094 0.091 <br /> 2 Unknown 6.25 23595 1 0.047 0.094 0.092 <br /> Next <br /> Ultrasonic <br /> Corrosion Remaining Next Thickness <br /> Rate Life Inspection Inspection <br /> (in/yr)Cr (years)Lr (years)I„ (years)Iut <br /> 0.0002 >30 5 5 <br /> 10 <br />