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API 653 In-Service Inspection Report <br /> for <br /> Pacific Ethanol HMT Inspection <br /> Tank No. T-7704 August a,2013 <br /> Stockton, CA Page 15 of 42 <br /> 4.3.2 SHELL THICKNESS CALCULATIONS <br /> The minimum acceptable shell plate thickness for tanks with a diameter equal to or less <br /> than two hundred (200)feet is calculated as follows (ref. API 653, Para. 4.3.3.1): <br /> 2.6(H—1)DG <br /> t min = <br /> SE <br /> Where: <br /> S = See Table = Allowable Stress(psi) <br /> D = 14.50 ft. = Nominal Diameter of Tank(ft.) <br /> G = 1.00 = Highest Specific Gravity of Contents <br /> H= See Table = Product Height(ft.) <br /> E= See Table _ Joint Efficiency <br /> Course Product Allowable Average Required <br /> Height Height Joint Stress Thickness Thickness <br /> Course in. ft. Efficiency (psi) in. in. <br /> 1 47 28.75 0.70 23,000 0.188 0.100 <br /> 2 47 24.83 0.70 23,000 0.188 0.100 <br /> 3 47 20.92 0.70 26,000 0.188 0.100 <br /> 4 16 . 17.00 0.70 26,000 0.188 0.100 <br /> 5 47 15.67 0.70 26,000 0.188 0.100 <br /> 6 47 11.75 0.70 26,000 0.188 0.100 <br /> 7 47 7.83 0.70 26,000 0.188 0.100 <br /> 8 47 3.92 0.70 26,000 0.188 0.100 <br /> Shell thickness calculations indicate the safe fill height of 28.75 feet can be utilized with <br /> product specific gravities up to 1.050. The hydrostatic test height can, therefore, utilize <br /> this maximum fill height (ref. API 653, Para. 4.3.3.2). These calculations do not take into <br /> account operational restrictions from such items as the high-level alarms or owner 1 <br /> operator-imposed safe fill restrictions. <br /> RECEIVE® <br /> AUG 14 2014 <br /> APIRPTNE.DOTREV 2 2325286617-776ar(Rey 1) ENVIROMML HEALTH <br /> DEPARTMENT <br />