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API 653 In-Service Inspection Report <br /> for <br /> Pacific Ethanol HMT Inspection <br /> Tank No. T-7704 Augusta,2013 <br /> Stockton, CA Page 16 of 42 <br /> 4.3.3 SHELL CORROSION RATE CALCULATIONS <br /> When the corrosion rate is not known, the maximum interval shall be 5 years (API 653, <br /> Para. 6.3.3.2 a). When the corrosion rate is known, the maximum interval shall be the <br /> smaller of RCA/2N years or fifteen (15)years (API 653, Para. 6.3.3.2 b): <br /> RCA = tact-tmin <br /> N= tp,„-test/Y <br /> 1 uT= tact-tmin/2 N <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 /> 1uT= See Table = Inspection interval for the next Ultrasonic (UT) <br /> testing, in years (not exceeding 15 years) <br /> Previous Current Minimum Next <br /> Thickness Measured Material Required Corrosion Ultrasonic(UT) <br /> Course (in.) Average Loss Thickness RCA Rate Thickness <br /> No. ( �)* Thickness (in.) (in.) (in,) (in./yr) Inspection <br /> (in.) 0_0 IM (years) <br /> MA !,e <br /> 1 0.188 0.187 0.001 0.100 0.087 0.0001 15 <br /> 2 0.188 0.187 0.001 0.100 0.087 0.0001 15 <br /> 3 0.188 0.187 0.001 0.100 0.087 0.0001 15 <br /> 4 0.188 0.188 0.000 0.100 0.088 . 0.0000 15 <br /> 5 0.188 0.188 0.000 0.100 0.088 0.0000 15 <br /> 6 0.188 0.188 0.000 0.100 0.088 0.0000 15 <br /> 7 0.188 0.188 0.000 0.100 0.088 0.0000 15 <br /> 8 0.188 0.188 0.000 0.100 0.088 0.0000 15 <br /> * = Assumed Original thickness data to facilitate corrosion rate calculations. <br /> RECEIVED <br /> APIRPTNE.DOT REV 2 2326296afT-7704r(Rev 1) 2 a <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <br />