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• API 653 In-Service Inspection Report <br /> for <br /> Pacific Ethanol HMT Inspection <br /> Tank No. T-6102 August 6,2013 <br /> Stockton, CA Page 16 of 46 <br /> 4.3.3 SHELL CORROSION RATE CALCULATIONS <br /> When the corrosion rate is not known, the maximum interval shall be 5 years (API 653, <br /> Para. 6.3.3.2 a). When the corrosion rate is known, the maximum interval shall be the <br /> smaller of RCA/2N years or fifteen (15)years (API 653, Para. 6.3.3.2 b): <br /> RCA = tact-tm/n <br /> N= tp.- tact/Y <br /> 1UT= tact- tmin/2N <br /> Where: <br /> RCA= See Table = Difference between the measured shell thickness <br /> and the minimum required thickness in inches. <br /> N= See Table = Shell corrosion rate in inches per year <br /> Y= Years in service 6 <br /> 1UT= See Table = Inspection interval for the next Ultrasonic (UT) <br /> testing, in years (not exceeding 15 years) <br /> • <br /> Previous Current Minimum Next <br /> Thickness Measured Material Required Corrosion Ultrasonic(UT) <br /> Course (in.) Average Loss Thickness RCA Rate Thickness <br /> No. (ta, )� Thickness (in.) (in.) (in.) (in./yr) Inspection <br /> (in.) (t .) (M (years) <br /> t, t r <br /> 1 0.250 0.257 0.000 0.165 0.092 0.0000 15 <br /> 2 0.250 0.254 0.000 0.146 0.108 0.0000 15 <br /> 3 0.188 0.188 0.001 0.116 0.071 0.0001 15 <br /> 4 0.188 0.188 0.000 0.100 0.088 0.0000 15 <br /> 5 0.188 0.191 0.000 0.100 0.096 0.0000 15 <br /> 6 0.188 0.187 0.001 0.100 0.087 0.0001 15 <br /> 7 0.188 0.188 0.001 0.100 0.087 0.0001 15 <br /> 8 0.188 0.191 0.000 0.100 0.091 0.0000 15 <br /> 9 0.188 0.190 0.000 0.100 0.090 0.0000 15 <br /> = Original thickness data provided by client to facilitate corrosion rate calculations. <br /> • <br /> E 'V ED <br /> AUG 14 2014 <br /> APIRPTNEoOT REV 2 232628681T6102r(Rev 1) 1116/20131:10 PM <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <br />