In practice, to determine the design value of the thickener area, a number of laboratory sedimentation tests are run using 2 litre cylinders and determining the value of ν S for a range of F values. The maximum value of A is taken as the design crosssectional area of the thickener tank.

We generally operate at a thickener rake speed of 8 to 12m/min Thus gearbox output rpm = = rake tip speed (m/min) π x diameter (m) = 8 π X 12 = rpm (d) Electric motor sizing To size an electric motor, we would use the following calculation; P = 2 π N T 60 x E x 1000