Laserfiche WebLink
API 653 In-Service Inspection Report <br /> for <br /> Pacific Ethanol HMT Inspection <br /> Tank No. T-7702 August a,2013 <br /> Stockton, CA Page 17 of 41 <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 /> 1VT= tact—tmin/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 /> IV, = 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�ay1* Thickness (in.) (in.) (in.) (in./yr) (years) <br /> (in.) (t0 (M 0.) <br /> -1 <br /> 1 0.188 0.177 0.011 0.100 0.077 0.0018 5 <br /> 2 0.188 0.175 0.013 0.100 0.075 0.0021 5 <br /> 3 0.188 0.175 0.013 0.100 0.075 0.0021 5 <br /> * =Assumed Original thickness data to facilitate corrosion rate calculations. <br /> REECE114FED <br /> AUG 14 2014 <br /> API RPTNE.DOTREV 2 2326286817-77D2r(Rev 1} F=N\JIQf-1h.lMZNil' L HEALTH <br /> DEPARTMENT <br />