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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 1936 sq in <br /> Total force on bottom of tank due to liquid pressure 1501 lbs <br /> Tensile strength of steel 36,000 Ib/sq in <br /> Weld efficiency 70 % <br /> Effective yield strength 25,200 Ib/sq in <br /> Total length, tank bottom perimeter 176 in <br /> Tank thickness, measured 0.149 in See Table 11 <br /> Cross section area of tank bottom perimeter 26.2 sq in <br /> Tensile stress at bottom tank perimeter 57 Ib/sq in <br /> Factor of safety 440 ok <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 ok <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 ok <br />