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American BiodieselSilo S-2 <br /> Stockton,CA g v_= Out of Service Inspection <br /> 7.0 Inspection Interval Calculations <br /> 7.1 Period Until Next External Inspection <br /> RCA/4N years <br /> RCA -_ Difference between the measured shell thickness and the <br /> minimum required thickness in inches. <br /> N= Shell corrosion rate in inches per year. <br /> The minimum acceptable thickness, in inches for each course as <br /> tm;ri calculated from API 653 4.3.3; however, tmin shall not be less <br /> than 0.100 inches for any tank course. <br /> Ms1 The minimum measured shell plate thickness in inches. <br /> RCA 0.109 in. <br /> Msr 0.209 in. <br /> tm;n 0.100 (in.) <br /> N 0.0023 in. <br /> The calculated inspection interval is 11.85 years. Based on the calculated interval, the next external visual <br /> inspection shall be conducted on or before 2/20/2012, 5 years. This interval is based on the Minimum Shell <br /> Plate Thickness from course number 2. <br /> Per API 653 section 6.3.2.1 the External Inspection interval shall not exceed 5 years <br /> 7.2 Period Until Next External UT Inspection <br /> RCA/2N years <br /> RCA 0.109 (in.) <br /> Mst 0.209 (in.) <br /> tm;n 0.100 in. <br /> N 0.0023 in. <br /> The calculated inspection interval is 23.70 years. Based on the calculated interval, the next external ultrasonic <br /> thickness inspection shall be conducted on or before 2/19/2022, 15 years. This interval is based on the <br /> Minimum Shell Plate Thickness from course number 3. <br /> Per API 653 section 6.3.3.1 the External UT Inspection interval shall not exceed 15 years <br /> Report Date Petroleum&Refractory, Inc. Page 10 of 21 <br /> February 27,2007 TankReporter 13.91 <br />