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API 653 In-Service Inspection Report <br /> for <br /> Pacific Ethanol HMT Inspection <br /> Tank No. T-7704 Augusts,2013 <br /> Stockton, CA Page 17 of 42 <br /> 4.3.4 SHELL EXTERNAL INSPECTION <br /> The external inspection interval shall be the lesser of 5 years or RCA14N (API 653, Para. <br /> 6.3.2.1): <br /> RCA = tact-tm+n <br /> N= tpm,-tact/Y <br /> IvT= tact-tmtn/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 /> I,� = 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. (try)* Thickness (in.) (in.) (in.) (in./yr) (years) <br /> (in.) (t,„,,,) (M (1w) <br /> t- <br /> 1 0.188 0.187 0.001 0.100 0.087 0.0001 5 <br /> 2 0.188 0.187 0.001 0.100 0.087 0.0001 5 <br /> 3 0.188 0.187 0.001 0.100 0.087 0.0001 5 <br /> 4 0.188 0.188 0.000 0.100 0.088 0.0000 5 <br /> 5 0.188 0.188 0.000 0.100 0.088 0.0000 5 <br /> 6 0.188 0.188 0.000 0.100 0.088 0.0000 5 <br /> 7 0.188 0.188 0.000 0.100 0.088 0.0000 5 <br /> 8 0.188 0.188 0.000 0.100 0.088 0.0000 5 <br /> * =Assumed Original thickness data to facilitate corrosion rate calculations. <br /> RECEIVU) <br /> • AUG 14 2014 <br /> APIRPTNE.DOT REV 2 2326286&T-7704;(Roy 1) ENVIRO 1f aNTAL HEALTH <br /> .DEPARTMENT <br />