Water transfer from down reservoir to upper reservoir Water is pumped from the reservoir for drinking purposes (see figure below). The expected flow rate is 600 m3 .h-1. The water passes through a pipe (diameter of 0.3 m) with a strainer, a valve and an elbow (see figure). At the pump outlet, water flows in another pipe of 0.5 m, 800 m long before reaching a second small reservoir Coefficients of minor head losses are the following: valve KL,v = 1.2, strainer KL,s = 3, elbow KL,e = 1.9. The pipe roughness is = 0.1 mm. The Net positive suction head NPSH of the pump at the flow rate, Q= 600 m3 .h-1, is 2 m. The vapor pressure of water is pvs = 2340 Pa. The pump efficiency is 53%. 1) Calculate the total head losses in the first pipe 2) Is there any risk of cavitation? 3) What is the power supplied to the pump?
Water transfer from down reservoir to upper reservoir
Water is pumped from the reservoir for drinking purposes (see figure below). The expected
flow rate is 600 m3
.h-1. The water passes through a pipe (diameter of 0.3 m) with a strainer, a
valve and an elbow (see figure). At the pump outlet, water flows in another pipe of 0.5 m, 800
m long before reaching a second small reservoir
Coefficients of minor head losses are the following: valve KL,v = 1.2, strainer KL,s = 3, elbow
KL,e = 1.9. The pipe roughness is = 0.1 mm.
The Net positive suction head NPSH of the pump at the flow rate, Q= 600 m3
.h-1, is 2 m. The vapor pressure of water is pvs = 2340 Pa. The pump efficiency is 53%.
1) Calculate the total head losses in the first pipe
2) Is there any risk of cavitation?
3) What is the power supplied to the pump?
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