3.) A reservoir has a low water level set at 200ft. The pump is set at 190 ft. It was determined through analysis that a...
3.) A reservoir has a low water level set at 200ft. The pump is set at 190 ft. It was determined through analysis that an existing pump is experiencing cavitation. Which of the following will decrease the risk of cavitation?
a. Increase the elevation of the pump
b. Increase the temperature of the water
c. Decrease the diameter of the suction pipeline
d. Decrease the pump speed
e. Increase the size of the pump impeller
Homework Answers
Cavitation is the formation and accumulation of bubbles around a pump impeller.when these bubbkes burst due to pressure, the impeller gets erooded and ruduces the efficiency of system. it can be avoided by many ways :
- Lower the temperature.
- Raise the liquid level in the suction vesse
- Reduce Specific Speed.
- Increase the diameter of the impeller.
- impeller inducer. Hence option E is correct.
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3.) A reservoir has a low water level set at 200ft. The pump is set at 190 ft. It was determined through analysis that a...
A reservoir has a lower water level set at 200 ft. The pump is set at...
A reservoir has a lower water level set at 200 ft. The pump is set at an elevation of 190 ft. It was determined through analysis that an existing pump is experiencing cavitation. Which of the following will decrease the risk of cavitation? Select all that apply. A) Raise the elevation of the pump. B) Increase the temperature of the water. C) Decrease the diameter of the suction pipeline. D) Operate the pump at a lower speed. E) Increase the...
A reservoir has a lower water level set at 200 ft. The pump is set at...
A reservoir has a lower water level set at 200 ft. The pump is set at an elevation of 190 ft. It was determined through analysis that an existing pump is experiencing cavitation. Which of the following will decrease the risk of cavitation? Select all that apply. A) Raise the elevation of the pump. B) Increase the temperature of the water. C) Decrease the diameter of the suction pipeline. D) Operate the pump at a lower speed. E) Increase the...
The value of (NPSHfor a pump is given by the manufacturer as 20 ft. Water is...
The value of (NPSHfor a pump is given by the manufacturer as 20 ft. Water is being pumped from a reservoir at a rate of 25 cfs. The water level in the reservoir is 6.0ft below the pump. Atmospheric pressure is 14.7 psia and water temperature is 40℉. If the total head loss in the suction pipe is 4.0 ft, is the pump safe from cavitation effects?
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A reservoir has a lower water level set at 200 ft. The pump is set at an elevation of 190 ft. It was determined through analysis that an existing pump is experiencing cavitation. Which of the following will decrease the risk of cavitation? Select all that apply. A) Raise the elevation of the pump. B) Increase the temperature of the water. C) Decrease the diameter of the suction pipeline. D) Operate the pump at a lower speed. E) Increase the...
A reservoir has a lower water level set at 200 ft. The pump is set at an elevation of 190 ft. It was determined through analysis that an existing pump is experiencing cavitation. Which of the following will decrease the risk of cavitation? Select all that apply. A) Raise the elevation of the pump. B) Increase the temperature of the water. C) Decrease the diameter of the suction pipeline. D) Operate the pump at a lower speed. E) Increase the...
The value of (NPSHfor a pump is given by the manufacturer as 20 ft. Water is being pumped from a reservoir at a rate of 25 cfs. The water level in the reservoir is 6.0ft below the pump. Atmospheric pressure is 14.7 psia and water temperature is 40℉. If the total head loss in the suction pipe is 4.0 ft, is the pump safe from cavitation effects?
3. A pump is to be used to pump water from the lower re servoir at an elevation of 10 ft The pump has a characteristic curve ft up to a reservoir shown in the graph below. What will be the volumetric flow rate of the water in this system? Elevation- 35 ft L- 50 t D-10 in -0.020 L-950 ft rid- Elevation 20A D-10 i -0.020 Elevation-15ft 80 60 40 Pump curve 20 1000 2000 3000 4000 5000 O,...
3· T ump delive lvers water at 60F from the lower at a rate of 2.5 ft/s. The suction line is 12-ft gs shown and the discharge line has a e the long with fittings ength of 190-ft with fittings shown. Assume piping used is Schedule 40 steel pipe. Detc following: a) Suction line size (1 mark) /0aase returs b) Discharge line size (1 mark) c) NPSH,for the suction line (2 marks) d) Pressure at the pump inlet (2 marks)...
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1. Water at 100°F is pumped from a sea-level reservoir to a tank open to the atmosphere through a new 14-in ID galvanized iron pipe as shown below. The minor loss coefficients in the suction and discharge piping are EK = 1.5 and Eduk = 7.2. Perform the following: a. derive the equation for the system curve as hy = a + b where he and a have units of feet and b has units of ft/gpm); b. plot the...
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