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API 653 In-Service Inspection Report <br /> for <br /> Pacific Ethanol HMT Inspection -- <br /> Tank No. T-7702 August s,2013 <br /> Stockton, CA Page 15 of 41 <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 /> min - <br /> SE <br /> Where: <br /> S = See Table = Allowable Stress (psi) <br /> D = 12.50 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. Efficient (psi) in. in. <br /> 1 60 13.00 0.85 27,000 0.177 0.100 <br /> 2 60 8.00 0.85 27,000 0.175 0.100 <br /> 3 36 3.00 0.85 27,000 0.175 0.100 <br /> Shell thickness calculations indicate the safe fill height of 13.0 feet can be utilized with <br /> product specific gravities up to 1.840. 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 /> E <br /> C"E I 1*t!TE:D <br /> AUG 14 2014 <br /> APIRPTNE.DOT REV 2 23262868rT-7702r(Rev 1) 11/672013 2:13 PM <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <br />