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API 653 In-Service Inspection Report <br /> for Inspection <br /> Pacific Ethanol <br /> Tank No. T-6106 August 8,2413 <br /> Stockton, CA Page 15 of 46 <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 /> t <br /> 2.6(H-1)DG <br /> SE <br /> Where: <br /> S = See Table = Allowable Stress (psi) <br /> D = 52.00 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. Effieiene si in. <br /> 1 95 40.00 0.70 23,600 0.384 0.319 <br /> 2 95 32.08 0.70 23,600 0.384 0.254 <br /> 3 95 24.17 0.70 26,000 0.256 0.172 <br /> 4 95 16.25 0.70 26,000 0.254 0.113 <br /> 5 95 8.33 0.70 1 26,000 0.254 1 0.100 <br /> Shell thickness calculations indicate the safe fill height of 40.0 feet can be utilized with <br /> product specific gravities up to 1.000. 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 /> R E 0> <br /> E <br /> AUG 14 2014 <br /> APIRPTNE.DQT REV 2 23262868,7.6106r(Rev 1) 1116120131:59 PM <br /> ENVIR®NWENTAL HEALTH <br /> DEPARTMENT <br />