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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 /> _ tact — tmin _ tprev — tact tact — tmin _ tact — tmin <br /> Lr Cr Cr DY Iut — 2 C I„ 4Cr <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 2.6 23595 1 0.047 0.094 0.066 <br /> 2 Unknown 3.3 23595 1 0.047 0.094 0.066 <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 /> Due to the fact that the original thickness is unknown we can only estimate the service life. <br /> 10 <br />