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American BiodieselSilo S-1 <br /> Stockton,CA g v_= Out of Service Inspection <br /> 6.0 Remaining Life Calculations <br /> The following details the calculated corrosion rates and remaining life based on the findings from this <br /> inspection. The following items have been calculated: <br /> C = t previous— t actual in inches per year <br /> Years between t previous and t actual <br /> R -- tactual- train in ears <br /> RL Cr <br /> Cr= Corrosion Rate in inches per years <br /> R, = The Remaining Life of a tank component in years. <br /> t previous= Thickness at the same location as t actual measured during a <br /> previous inspection or nominal thickness, in inches. <br /> taetaal= The thickness measured at the time of inspection for a given <br /> location or component used to determine the minimum allowable <br /> thickness, in inches. <br /> taia,= The minimum allowable thickness for a given location or <br /> component, in inches. <br /> 6.1 Shell Plates Remaining Life <br /> Course t previous Year t actual Year Cr train RL <br /> Remaining Life <br /> (in.) Obtained tp (in.) Obtained to (In./yr.) (in.) <br /> (yr.) <br /> 3 0.250 1989 0.210 2007 0.0022 0.100 50.00 <br /> 2 0.250 1989 0.227 2007 0.0013 0.100 97.70 <br /> 1 (Cone) 0.250 1989 0.227 2007 0.0013 0.100 97.70 <br /> t previous data is based on nominal plate thickness <br /> 6.2 Top Head Plate Remaining Life <br /> Plate t previous Year t actual Year Cr thein RI <br /> Remaining Life <br /> No. (in.) Obtained tp (in.) Obtained to (In./yr.) (in.) <br /> r. <br /> 0.250 1989 0.220 2007 0.0017 0.090 76.47 <br /> t previous data is based on nominal plate thickness <br /> Report Date Petroleum&Refractory, Inc. Page 9 of 21 <br /> March 6,2007 TankReporter 13.91 <br />