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• API 653 In-Service Inspection Report <br /> for <br /> Pacific Ethanol HMT Inspection <br /> Tank No. T-6102 August6,2013 <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 = tact-tmin <br /> N= tpm,-tact/Y <br /> tvr=tett-tmm/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 /> = 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. (t,.,)* Thickness (in.) (in.) (in.) (in./yr) (years) <br /> (in.) (GA (M (tr) <br /> t, <br /> 1 0.250 0.257 0.000 0.165 0.092 0.0000 5 <br /> 2 0.250 0.254 0.000 0.146 0.108 0.0000 5 <br /> 3 0.188 0.188 0.001 0.116 0.071 0.0001 5 <br /> 4 0.188 0.188 0.000 0.100 0.088 0.0000 5 <br /> 5 0.188 0.191 0.000 0.100 0.096 0.0000 5 <br /> 6 0.188 0.187 0.001 0.100 0.087 0.0001 5 <br /> 7 0.188 0.188 0.001 0.100 0.087 0.0001 5 <br /> 8 0.188 0.191 0.000 0.100 0.091 0.0000 5 <br /> 9 0.188 1 0.190 1 0.000 0.100 0.090 0.0000 5 <br /> = Original thickness data provided by client to facilitate corrosion rate calculations. <br /> RECEIVED <br /> AUG 14 2014 <br /> APIRPTNE.DOT REV 2 2326286W1 102r(Rev 1) 11W0131:10 PM <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <br />