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ABOVEGROUND STORAGE TANK ASSESSMENT CALCULATIONS <br /> The 800-gallon waste oil aboveground storage tank (AST) is fabricated of 10-gauge steel with a standard <br /> thickness of 1/8 in, width of 72 inches, length of 48 inches, and height of 61 inches. The manufacturer, <br /> Superior Tank, indicated that the tank weighs approximately 2,000 pounds when empty. Waste oil is <br /> temporarily stored within the tank.The AST capacity of 800-gallons of waste oil weighs approximately 5,920 <br /> pounds. <br /> HORIZONTAL SHEAR CALCULATION <br /> V = 0.7 x Cs x I x Total AST Empty Weight <br /> where: V = Horizontal Shear <br /> Cs = Seismic Coefficient (Table 16-Q, 1997 Uniform Building Code (UBC)) <br /> I = Occupancy Importance Factor(Table 16-k, 1997 UBC)) <br /> V = 0.7 x 0.36 x 1.0 x 2,000 pounds force (Ibf) <br /> = 504 Ibf <br /> The horizontal shear is calculated at approximately 504 Ibf. <br /> OVERTURN MOMENT CALCULATION <br /> OT = [V x Tank Height(Hp)x 0.5] - [Total AST Empty Weight x Tank Width (Wp) x 0.5] <br /> where: OT = Overturn Moment <br /> Hp = Tank Height = 61 in <br /> Wp =Tank Width = 72 in <br /> OT = [504 Ibf x 61 in x (1 ft/12 in)x 0.5] - [2,000 Ib. x 72 in x (1 ft/12 in)x 0.5] = 1281 - <br /> = -4,719 Ibf ft <br /> The tank overturn moment is calculated at approximately— 4,719 Ibf ft. which is less than zero, therefore <br /> the tank will not overturn. <br /> SAFETY FACTOR CALCULATION <br /> SF = [(Total AST Empty Weight x Wp x 0.5)] _ [V x Tank Height (Hp)x 0.5] <br /> where: SF= Safety Factor <br /> SF = [(2,000 Ib x 72 in x (1 ft= 12 in)x 0.5)] _ [504 Ibf x 61 in x (1 ft/12 in)x 0.5] <br /> = 4.7 <br /> The safety factor was calculated at approximately 4.7 which is greater than 0, therefore the safety factor is <br /> sufficient to not overturn. <br /> Note: <br /> in=inch <br /> ft=foot <br /> Che.=7.5 Ib/gal=pounds to gallon conversion factor <br />