Laserfiche WebLink
API 653 Out-of-Service Inspection Report <br /> for ■ir a■ <br /> J.R. Simplot Inspection <br /> Tank No. 8 August 27-28,2008 <br /> Lathrop, CA Page 19 of 54 <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= 45 = Nominal Diameter of Tank (ft.) <br /> G = 1.8 = Highest Specific Gravity of Contents <br /> H= See Table = Product Height(ft.) <br /> E = See Table = Joint Efficiency <br /> Course Product Joint Allowable Average Required <br /> Height Height Efficiency Stress Thickness Thickness <br /> Course in. ft. (psi) in. in. <br /> 1 84 23.00 1.00 23,600 0.456 .0.109 <br /> 2 96 16.00 1.00 23,600 0.335 0.100 <br /> 3 96 8.00 1.00 26,000 0.192 0.100 <br /> Shell thickness calculations obtained during this inspection indicate a maximum safe fill <br /> height of 23.00 feet can be utilized with product specific gravities up to 1.8 (sulfuric acid <br /> at 98% concentration). The hydrostatic test height can, therefore, utilize this maximum <br /> fill height (ref. API 653, Para. 4.3.3.1). These calculations do not take into account <br /> operational restrictions from such items as high-level alarms or owner 1 operator- <br /> imposed safe fill restrictions. <br /> APIRPTNE.D01 REV 2 2628030418r.doc 912512008 10:09 AM <br />