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API 653 In-Service Inspection Report <br /> for <br /> Pacific Ethanol HMT Inspection <br /> Tank No. T-6103 August 7,2013 <br /> Stockton, CA Page 17 of 46 <br /> 4.3.4 SHELL EXTERNAL INSPECTION <br /> The external inspection interval shall be the lesser of 5 years or RCA/4N (API 653, Para. <br /> 6.3.2.1): <br /> RCA = fact-tmin <br /> N= tprev- tact/Y <br /> IVT= tact- tm;,,/4N <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 /> 1vt= See Table = Inspection interval for the next External Visual <br /> Inspection, in years (not exceeding 5 years) <br /> Previous Current Minimum Next <br /> Thickness Measured Material Required Corrosion External Visual <br /> Course (in.) Average Loss Thickness RCA Rate Inspection <br /> No. (tPn )* Thickness (in.) (in.) (in.) (in./yr) (years) <br /> (in.) (tm.) (M U.) <br /> r-1 <br /> 1 0.250 0.254 0.000 0.165 0.089 0.0000 5 <br /> 2 0.250 0.253 0.000 0.146 0.106 0.0000 5 <br /> 3 0.188 0.185 0.004 0.116 0.068 0.0006 5 <br /> 4 0.188 0.186 0.002 0.100 0.086 0.0003 5 <br /> 5 0.188 0.187 0.001 0.100 0.087 0.0001 5 <br /> 6 0.188 0.186 0.003 0.100 0.085 0.0005 5 <br /> 7 0.188 0.187 0.002 0.100 0.087 0.0001 5 <br /> 8 0.188 0.185 0.004 0.100 0.084 0.0004 5 <br /> 9 0.188 0.180 0.008 0.100 0.080 0.0008 5 <br /> * = Original thickness data provided by client to facilitate corrosion rate calculations. <br /> • <br /> RECEIVED <br /> our 1 <br /> APIRPTNE.DDT REV 2 232628681r6103r(Rev 1) 111 l2 13 a P9014 <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <br />