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A process fluid is pumped from the bottom of one distillation column to another,using a centrifugal pump. The line is standard commercial steel pipe 75 mminternal diameter. From the column to the pump inlet the line is 25 m long andcontains six standard elbows and a fully open gate valve. From the pump outlet tothe second column the line is 250 m long and contains ten standard elbows, fourgate valves (operated fully open) and a flow-control valve. The fluid level in thefirst column is 4 m above the pump inlet. The feed point of the second column is6 m above the pump inlet. The operating pressure in the first column is 1.05 baraand that of the second column 0.3 barg.Determine the operating point on the pump characteristic curve when the flow issuch that the pressure drop across the control valve is 35 kN/m2.The physical properties of the fluid are: density 875 kg/m3, viscosity1.46 mN m2s.Also, determine the NPSH, at this flow-rate, if the vapour pressure of the fluid atthe pump suction is 25 kN/m2.Pump characteristicFlow-rate, m3/h 0.0 18.2 27.3 36.3 45.4 54.5 63.6Head, m of liquid 32.0 31.4 30.8 29.0 26.5 23.2 18.3
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