In a detergent making process, 25 m3/h of water flows through a 5 cm diameter pipe system as follows: Point 1, the suction side of the pump, is at a pressure of 175 kPa. After exiting from the pump, the water runs through a 2 m horizontal length of pipe, a fully-open gate valve, another 2 m horizontal run, a 90º bend, 0.5 m vertical rise, 90º bend, 4 m horizontal run, 90º bend, 1.5 m vertical rise, 90º bend, 2 m horizontal run, half-open globe valve, 6 m horizontal run, 90º bend, 4 m vertical rise, 90º bend, 4.5 m horizontal run, 90º bend, 4 m vertical rise, 90º bend, 9 m horizontal run, fully- open gate valve, 1 m horizontal run then, finally, entry into a tank containing 10 m of liquid. Point 2 is the liquid surface in the tank, which is open to atmosphere. (a) If the center-line of the pump and the bottom of the tank are both at grade level, estimate the head that the pump must deliver. Take the density and viscosity of water as 1000 kg/m3 and 10-3 Pa·s, respectively. (b) What is the pump outlet pressure? (c) Calculate the power consumed by the pump.
In a detergent making process, 25 m3/h of water flows through a 5 cm diameter pipe system as
follows:
Point 1, the suction side of the pump, is at a pressure of 175 kPa. After exiting from the pump,
the water runs through a 2 m horizontal length of pipe, a fully-open gate valve, another 2 m
horizontal run, a 90º bend, 0.5 m vertical rise, 90º bend, 4 m horizontal run, 90º bend, 1.5 m vertical
rise, 90º bend, 2 m horizontal run, half-open globe valve, 6 m horizontal run, 90º bend, 4 m vertical
rise, 90º bend, 4.5 m horizontal run, 90º bend, 4 m vertical rise, 90º bend, 9 m horizontal run, fully-
open gate valve, 1 m horizontal run then, finally, entry into a tank containing 10 m of liquid. Point
2 is the liquid surface in the tank, which is open to atmosphere.
(a) If the center-line of the pump and the bottom of the tank are both at grade level, estimate the
head that the pump must deliver. Take the density and viscosity of water as 1000 kg/m3 and 10-3
Pa·s, respectively.
(b) What is the pump outlet pressure?
(c) Calculate the power consumed by the pump.
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