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Page 2 <br /> Gross Volume over Shell <br /> The gross volume above the shell is a prism equal in length to the tank shell and <br /> having a trapezoidal cross-section. <br /> 1 f I <br /> 9V5= 2L5 2 {(r + f)+ [r+f+ (r+h)(an30'])(r+ h) = 2Ls lr + f+ Z(r+ h)tan30'l(r+h) <br /> Gross Volume over Ilead ` <br /> The gross volume above both heads comprises two halves of a truncated cone with <br /> height equal to (r+h) and major acid minor radii equal to r+f+ (r+h)tan30' and r+f <br /> respectively. <br /> 2 } <br /> JVh = 3 (r + h){(r+ f)2 , (r - f)(r.f> (r+h)tan30°] + [r+f+ (r+h)tan30°]2 <br /> I <br /> =rr (r + h) (r+ f)[r+f+ (r+h)tan30°) + 3 [(r+h)tan30']Z� <br /> Soil Weights <br /> Wsoil =',/s (�%s - ,Vh - aVt - AVO <br /> PLSISTANCL jQ FLOTATION <br /> The net negative buoyancy is the total of the tank, riser and soil weights minus the <br /> total buoyant force. The tank will resist flotation if the net negative buoyancy is <br /> positive. Die safety, factor against flotation is the total of the tank, riser and soil <br /> weights divided by the total buoyant furce- <br /> Fnb = Wviil + Wt + Wr - Fbt <br /> W soil + Wz + Wr Fnb y I <br /> FS = -- F _ 'F <br /> V bt <br />