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• API 653 In-Service Inspection Report <br /> for Inspection <br /> Pacific Ethanol <br /> Tank No. T-6103 August 7,2013 <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 = taa-tmt„ <br /> N= tp.,-tact/Y <br /> IUT= 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 /> IIJT= 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. (tpn )* Thickness (in.) (in.) (in.) (inJyr) Inspection <br /> (in.) WA (M (years) <br /> t oe . <br /> 1 0.250 0.254 0.000 0.165 0.089 0.0000 15 <br /> 2 0.250 0.253 0.000 0.146 0.106 0.0000 15 <br /> 3 0.188 0.185 0.004 0.116 0.068 0.0006 15 <br /> 4 0.188 0.186 0.002 0.100 0.086 0.0003 15 <br /> 5 0.188 0.187 0.001 0.100 0.087 0.0001 15 <br /> 6 0.188 0.186 0.003 0.100 0.085 0.0005 15 <br /> 7 0.188 0.187 0.002 0.100 0.087 0.0001 15 <br /> 8 0.188 0.185 0.004 0.100 0.084 0.0004 15 <br /> 9 0.188 0.180 0.008 0.100 0.080 0.0008 15 <br /> * = Original thickness data provided by client to facilitate corrosion rate calculations. <br /> RECEIVED <br /> aur, d 2014 <br /> APIRPTNE.DOT REV 2 23262868,T-6103r(Rev 1) 11l&20131:30 P <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <br />