Crude dichlorobenzene is pumped from a storage tank to a distillation column. The tank is blanketed with nitrogen and the pressure above the liquid surface is held constant at 0.1-bar gauge pressure. The minimum depth of liquid in the tank is 1 m. The distillation column operates at a pressure of 500 mmHg (500 mm of mercury, absolute). The feed point to the column is 12 m above the base of the tank. The tank and column are connected by a 50-mm internal diameter commercial steel pipe, 200 m long. The pipe run from the tank to the column contains the following valves and fittings: 20 standard radius 90 elbows, two gate valves to isolate the pump (operated fully open), an orifice plate and a flow-control valve. If the maximum flow rate required is 20,000 kg/h, calculate the pump motor rating (power) needed. Take the pump efficiency as 70% and allow for a pressure drop of 0.5 bar across the control valve and a loss of 10 velocity heads across the orifice. Density of dichlorobenzene 1300 kg/m3 , viscosity 1.4 cp

Noted: (please solved using equivalent pipe diameter method )