u. Water has to be supplied to a town with one lakh population at the rate of 150 litres per capita per day from a river 2000 m away. The difference in elevation between the lowest water level in, the sump and the reservoir is 36 m. If the demand has to be supplied in 8 hours, determine the size of the main and the brake horse power of the pumps required. Assume maximum demand as 1.5 times the average demand. Assumef = 0.0075, velocity in the pipe 2.4 m/sec, and efficiency of pump 80 per cent. %3D

u. Water has to be supplied to a town with one lakh population at the rate of 150 litres per capita per day from a river 2000 m away. The difference in elevation between the lowest water level in, the sump and the reservoir is 36 m. If the demand has to be supplied in 8 hours, determine the size of the main and the brake horse power of the pumps required. Assume maximum demand as 1.5 times the average demand. Assumef = 0.0075, velocity in the pipe 2.4 m/sec, and efficiency of pump 80 per cent. %3D

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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7. A flow of 0.03 m³/s must be pumped against a head of 30 m. The pump will be driven by an electric motor with a speed of 2000 rpm. What type of pump should be used and what is the corresponding efficiency?
A five cylinders reciprocating pump raises the water level by 150 m and the theoretical discharge is 0.20 m³/s. The velocity in the delivery pipe is 2.0 m/s. Total head loss in pipes is 20 m. What is the input power, if the efficiency of the pump is 0.87?
Two reservoirs A and B have elevations of 250m and 100m respectively. It is connected by a pipe having a diameter of 250mm and a length of 100m. A turbine is installed at point in between reservoirs A and B. If C = 120, compute the following if the discharge flowing in the pipeline is 150 liters/sec. Compute the power generated by the turbine.
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2. Water is pumped from a lower reservoir using a 75 kW pump. If the height of water at the higher reservoir is 120m. And the flow rate of the pump is 0.03 m^3/s, what are the head losses of the system? 0.03 m's 120m 75kW Pump
5. Water from a reservoir is pumped over a hill through a pipe 90 cm in diameter, and a pressure of 200 KPa is maintained at the summit where the pipe is 90 m above the reservoir. The quantity pumped is 1.40 m3/s and by reason of friction there is a head loss of 3 J/N between reservoir and summit. If the pump is 90% efficient, determine the input power of the pump.
Two reservoirs A and B have elevations of 250 m and 100 m,respectively. The two tanks are connected by a 250-mm diameterpipe, 250-m long, with a turbine placed along its length. If the flow ofwater in the pipe is 140 L/s and C = 120, then:Determine the power output of the turbine in kW if the efficiency ofthe turbine is 85%.
The water needs of a small farm are to be met by pumping water from a well that can supply water continuously at a rate of 5 L/s. The water level in the well is 20 m below the ground level, and water is to be pumped to a large tank on a hill, which is 58 m above the ground level of the well, using 6-cm internal diameter plastic pipes. The required length of piping is measured to be 510 m, and the total minor loss coefficient due to the use of elbows, vanes, etc. is estimated to be 12. Taking the efficiency of the pump to be 75 percent, determine the rated power of the pump that needs to be purchased, in kW. The density and viscosity of water at anticipated operation conditions are taken to be 1000 kg/m3 and 0.00131 kg/m⋅s, respectively. Is it wise to purchase a suitable pump that meets the total power requirements, or is it necessary to also pay particular attention to the large elevation head in this case? Explain.
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