A centrifugal pump compresses 3000 liters/min of water from 98 kPa to 300 kPa.The inlet and outlet temperatures are 25°C. The inlet and discharge piping are onthe same level, but the diameter of the inlet piping is 15 cm, whereas that of thedischarge piping is 10 cm. Determine the pump power in kilowatts.

Given data: Q=3000 L/min=300060×1000=0.05 m3/sP1=98 kPaP2=300 kPaT1=T2=25°Cd1=15 cmd2=10 cm Need to…

Answered: A centrifugal pump compresses 3000…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A pump operates at 78% efficiency when it is pumping water (density = 1000 kg/m³) at a volume flow rate of 0.3 m³/s with a head of 17 m. The gravitational acceleration g = 9.81 m/s². The pump impeller's shaft power is kW.
When water is pumped into a water tank 20 m above a lake with a flow rate of 70 l/s, 20.4kW of electrical power is consumed. Determine the efficiency of the pump-motor group by ignoring the friction losses in the pipes and the change in kinetic energy. Determine the pressure difference between the inlet and outlet of the pump.
A pump takes water at 60°F from a large reservoir and delivers it to the bottom of an open elevated tank 25 ft above the reservoir surface through a 3 inch ID pipe. The inlet to the pump is located 10 ft below the water surface, and the water level in the tank is constant at 160 ft above the reservoir surface. The pump delivers 150 gal/min. If the total loss of energy due to friction in the piping system is 35 ft·lbf/lb. The pump and its motor have an overall efficiency of 55 %. i. Determine Delta Z (Z2 - Z1) in ft. ii. What is the actual shaft work needed for this particular mass flow rate in (ft-lbf)/s. iii. What is the mass flow rate of the water in lbm/s?
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A water pump is required to deliver 10 m2/min of water at a temperature of 27°C and the pressure is to raised from 100 kN/m2 to 300 kN/m2. Suction and delivery pipes are at 3 m and 9 m from datum with their respective diameter of pipes as 25 cm and 17 cm. Neglecting the effect of temperature on liquids, calculate the power required to drive the pump. Assume specific volume of water as 0.001 m2/kg and neglect the effect of pressure on volume.
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A turbine is discharging 10 m/s under a head of 22 m at 200 rpm. The efficiency is 90%. Determine the performance of turbine under a head of 44 m.
The centrifugal pump is operating under steady flow condition delivers 2270 kg/min of water from an initial pressure of 82740 Pa to a final pressure of 275800 Pa. The diameter of the inlet pipe to the pump is 15.24 cm and the diameter of the discharge pipe is 10.16 cm. Calculate the work of the system in kJ/ min.
A centrifugal pump driven by a 160-hp motor rotating at 2400 rpm is used to pump 70°F water in a manufacturing plant. The pump operates against a head of 100 ft and has an efficiency of 70%. If this pump is used under a head of 196 ft, what power will be required?
A pump takes water at 60°F from a large reservoir and delivers it to the bottom of an open elevated tank 25 ft above the reservoir surface through a 3 inch ID pipe. The inlet to the pump is located 10 ft below the water surface, and the water level in the tank is constant at 160 ft above the reservoir surface. The pump delivers 150 gal/min. If the total loss of energy due to friction in the piping system is 35 ft·lbf/lb. The pump and its motor have an overall efficiency of 55 %. a. Assuming that the large open reservoir is open to the atmosphere as well, what is the mechanical energy balance eq for the system? b. What is the Reynolds number for the flow ?

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