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Calculations for Shell & Cone-Shaped Tank Bottom - per API 620 <br /> Owner American Biodeisel <br /> Tank No. silo S-2 <br /> Diameter, D 14.000 ft 168.00 inches <br /> Shell Height, H 18.125 ft 217.50 inches <br /> Fill Height 18.125 ft 217.50 inches <br /> Nominal Shell thickness 0.250 inches <br /> Measured Shell thickness, tc 0.236 inches Average near spring line <br /> Nominal Cone thickness 0.250 inches <br /> Measured Cone thickness, th 0.240 inches Average near spring line <br /> Specific Gravity of contents of tank, SG 1.000 <br /> Depth of Cone, d 145.50 inches <br /> S, allowable tensile stress of shell & cone 15,200 psi <br /> Joint Efficiency cone-to-shell, E, 0.70 <br /> Joint Efficiency shell vertical joints, E2 0.70 <br /> Operating Pressure at top of tank, Po 0.00 psi 0 psf <br /> Note that per API 620 the max. operating pressure at top of tank is 15 psig. <br /> 1/2 Apex angle, alpha = a 0.523576 radians 30.00 degrees <br /> Total Pressure, P at plane AA 1131.00 psf(includes hydrostatic head+ Po) 7.85 psi <br /> H <br /> A ° A <br /> c <br /> Figure No. Al <br /> 1) Shell Unit Forces @ Plane AA, See Figure No. A2 <br /> Sum FX = 0 <br /> 2T2s = PD <br /> T2s = P D/2 <br /> T2s = 660 Ib/in <br />