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API 653 In-Service Inspection Report <br /> for <br /> Pacific Ethanol HMT inspection <br /> Tank No. T-6105 August 7,2013 <br /> Stockton, CA Page 17 of 45 <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_tm7n <br /> N= tprev— tact/Y <br /> 1VT= tact—tmfn/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.1yr) (years) <br /> (in.) (t A (M U.) <br /> MA <br /> 1 0.375 0.385 0.000 0.319 0.065 0.0000 5 <br /> 2 0.375 0.383 0.000 0.254 0.129 0.0000 5 <br /> 3 0.250 0.253 0.000 0.172 0.080 0.0000 5 <br /> 4 0.250 0.258 0.000 0.113 0.145 0.0000 5 <br /> 5 0.250 0.251 0.000 0.100 0.151 0.0000 5 <br /> * = Original thickness data provided by client to facilitate corrosion rate calculations. <br /> AUG 14 2014 <br /> AP{RPTNE.DOT REV 2 23262668a-6105r(Rev 1) 1116/2013 1:43 PM <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <br />