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AST ATMOSPHERIC STORAGE TANK FIXED ROOF EVALUATION <br />MINIMUM THICKNESS, REMAINING LIFE, PRESSURE CALCULATIONS Date 03/04/2023 <br />File No Report No Client Inspector Tank No Temp (deg F) <br />14479 Canary 3134A Canary Renewables Corp. Gavin Kopp T-631 3134A 100 <br />Where; <br />Ca = remaining corrosion allowance of the tank component under consideration, in inch (t act - t min). <br />Cr = corrosion rate of the tank component under consideration, in inch per year (t prev - t act / Y). <br />oz = unit of measurement, (weight, in ounces, per square inch), (16 oz per pound) <br />psi = unit of measurement, (weight, in pounds, per square inch) <br />RL = estimated remaining life of the tank component under consideration, in year (Ca / Cr). <br />t act = actual thickness measurement of the tank component under consideration, as recorded at the <br />time of inspection, in inch. <br />t min = minimum required thickness of tank component, at the design MAWP at the design temperature <br />(200 degF for atm AST's), in inch (greater of psi/wt or 0.090"). <br />t nom = design nominal thickness of tank component under consideration, in inch. <br />t prev = previous thickness measurement of the tank component under consideration, as recorded at <br />last inspection or nominal thickness if no previous thickness measurements, in inch. <br />t yn = thickness of the tank component under consideration at the next inspection at twice the <br />calculated corrosion rate, in inch (t act - (2*Cr*Yn). <br />wt = weight of plate per cubic inch. <br />wc = unit of measurement, (height, in inch, of water column bearing on 1 Sq.inch area), (27.7 wc per <br />pound) <br />Y = time span between thickness readings or age of the tank component if tnom is used for tprev, in <br />year. <br />Yn = estimated time span to next inspection of the tank component under consideration, in year. <br />ROOF PLATES - REMAINING LIFE <br />Y t prev (inch) t act (inch) t min (inch) Cr (inch/yr) Ca (inch) RL <br />9 0.250 0.256 1.274 0 0 >20 <br />ROOF MAXIMUM ALLOWABLE INTERNAL PRESSURE <br />Material Category wt <br />CS/Crom. Stl 0.3 <br />Yn tyn (inch) psi oz. wc <br />0 <br />RELIEF VALVE SETTING EVALUATION <br />Setting unit <br />10 wc = 0.361 (psi) <br />MAX Allowed <br />wc <br />Relief setting is satisfactory <br />Coating was not removed for UT inspection data.