The characteristic curve of a centrifugal pump running at 1 300 rpm can be constructed from the following table:
Volume flow rate, (m³/s)
Total pressure head, (m)
Power input, (kW)
0 0.075 0.15 0.20 0.25 0.3
73 72 70 67 62 53
0 112 147 170 189 198
The pump is connected to a piping system and discharges water to a tank 62 m above the pump. The pump is 1.5
m above the sump and the suction pipe with its fittings has an equivalent length of 20 m. The discharge pipe with
its fittings has an equivalent length of 130 m. The suction as well as the discharge pipes have diameters of 300
mm. Assume f = 0.006 and the density as 1 000 kg/m³, determine:
a) The discharge (volumetric flow rate), as well as pump efficiency,
[0.189 m³/s; 76.4%]
b) The pressure at the inlet of the pump.
[-24 010 Pa]
c) Determine the pump's operating point when operating at the speed of 1 400
[0.27 m³/s; 72 m]
