Laserfiche WebLink
API 653 In-Service Inspection Report <br /> for <br /> Pacific Ethanol HMT Inspection <br /> Tank No. T-6105 August 7,2013 <br /> Stockton, CA Page 15 of 45 <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 min 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. Efficiency (Ps 1) in. in. <br /> 1 95 40.00 0.70 23,600 0.385 0.319 <br /> 2 95 32.08 0.70 23,600 0.383 0.254 <br /> 3 95 24.17 0.70 26,000 0.253 0.172 <br /> 4 95 16.25 0.70 26,000 0.258 0.113 <br /> 5 95 8.33 0.70 26,000 0.251 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 /> D <br /> is <br /> AUG 14 2014 <br /> APIRPTNE.DOT REV 2 23262866rM6105r(Rev 1) 1116120131:43 PM <br /> ENVIRONMENTAL HEALTH <br /> W77PARTMENT <br />