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Hydrostatic, Soil and Concrete Calculations <br />for Waste Oil Tank: <br />Hydrostatic pressure in tank: <br />Note that UL 142 requires testing at the factory under 25 psi pressure <br />For tank bottom perimeter: <br />Area of tank bottom <br />1936 sq in <br />Total force on bottom of tank due to liquid pressure <br />1501 <br />lbs <br />Tensile strength of steel <br />36,000 <br />Ib/sq in <br />Weld efficiency <br />70 <br />% <br />Effective yield strength <br />25,200 <br />Ib/sq in <br />Total length, tank bottom perimeter <br />176 <br />in <br />Tank thickness, measured <br />0.149 <br />in <br />Cross section area of tank bottom perimeter <br />26.2 <br />sq in <br />Tensile stress at bottom tank perimeter <br />57 <br />Ib/sq in <br />Factor of safety <br />440 <br />Pressure on concrete: <br />for Waste Oil Tank: <br />Weight of tank and contents 3001 lbs <br />Number of supports on which tank rests 2 <br />Area of supports on which tank rests 352 sq in <br />Pressure on concrete 8.53 Ib/sq in <br />Compressive strength, concrete 3000 Ib/sq in <br />Factor of safety 352 <br />Pressure on soil: <br />Pressure on soil due to concrete alone 0.462 Ib/sq in <br />Total pressure of tank, contents and concrete 8.99 Ib/sq in <br />Allowable pressure, soil 1500 Ib/sq in <br />Factor of safety 167 <br />See Table 11 <br />ok <br />ok <br />ok <br />