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• API 653 In-Service Inspection Report <br /> for <br /> Pacific Ethanol HMT Inspection <br /> Tank No. T-6103 August 7,2013 <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 /> r min = 2.6(H—1)DG <br /> SE <br /> Where: <br /> S = See Table = Allowable Stress (psi) <br /> D = 30.00 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 /> Joint <br /> Height Height Stress Thickness Thickness <br /> Course in. ft. Efficient (psi) in. <br /> 1 48 36.00 0.70 23,600 0.254 0.165 <br /> 2 48 32.00 0.70 23,600 0.253 0.146 <br /> 3 48 28.00 0.70 26,000 0.185 0.116 <br /> 4 48 24.00 0.70 26,000 0.186 0.100 <br /> 5 48 20.00 0.70 26,000 0.187 0.100 <br /> 6 48 16.00 0.70 26,000 0.186 0.100 <br /> 7 48 12.00 0.70 26,000 0.187 0.100 <br /> 8 48 8.00 0.70 26,000 0.185 1 0.100 <br /> 9 48 4.00 0.70 26,000 1 0.180 1 0.100 <br /> Shell thickness calculations indicate the safe fill height of 36.0 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 / <br /> operator-imposed safe fill restrictions. <br /> RECEIV <br /> • AUG 14 2014 <br /> APIRPTNE.DpT REV 23262688R6f03r(Rev i) ENVIRd 13ENTAL HEALTH <br /> DEPARTMENT <br />