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API 653 In-Service Inspection Report <br /> for ■r <br /> Pacific Ethanol HMT Inspection <br /> Tank No. T-6106 August 8,2013 <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—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 /> 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. (tA�X Thickness (in.) (in.) (in.) (in.lyr) (years) <br /> (in.) 0.0 (M U.) <br /> tart <br /> 1 0.375 0.384 0.000 0.319 0.064 0.0000 5 <br /> 2 0.375 0.384 0.000 0.254 0.129 0.0000 5 <br /> 3 0.250 0.256 0.000 0.172 0.084 0.0000 5 <br /> 4 0.250 0.254 0.000 0.113 0.141 0.0000 5 <br /> 5 0.250 0.254 0.000 0.100 0.153 0.0000 5 <br /> * = Original thickness data provided by client to facilitate corrosion rate calculations. <br /> • <br /> RECEIVED <br /> APIRPTNE.06T REV 232628687-6106r(Rev 1) 3. 'S 14 <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <br />