Question $10$

Crude Oil having a specific gravity of $0\mathrm{.}93$ and a viscosity of $4CP$ is drained by gravity from the bottom of a tank. The depth of the liquid above the draw$-$off connection in the tank is $6m.$ The line from the draw$-$off is a $76\mathrm{.}2mm$ schedule $40$ commercial steel pipe. Its length is $45m$ and it contains one ell and two gate valves. The oil discharges into the atmosphere $9m$ below the draw$-$off connection of the tank. Calculate the flow rate through the line in $\frac{m^3}{h}r.$

Hint

Initial guess of the velocity can be taken as $4\frac{m}{s}$