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To produce a high head multi-stage centrifugal pumps, the impellers are connected :
- a)in parallel
- b)in series
- c)in parallel and in series both
- d)none of the above
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
To produce a high head multi-stage centrifugal pumps, the impellers ar...
Explanation:
Introduction:
Multi-stage centrifugal pumps are used to generate high head or pressure in various applications, such as water supply, irrigation, oil and gas industry, and power plants. These pumps consist of multiple impellers that are arranged in a specific configuration to achieve the desired head.
Impeller Connection:
The impellers in a multi-stage centrifugal pump are connected in series. This means that the discharge of one impeller is connected to the suction of the next impeller, and so on. In this configuration, the fluid passes through each impeller in a sequential manner, with the pressure increasing at each stage.
Reasons for Series Connection:
1.Increased Head: Connecting the impellers in series allows the pump to generate a higher head compared to a single-stage pump. Each impeller adds to the total head by increasing the pressure of the fluid. Thus, the total head is the sum of the heads produced by each impeller.
2. Efficiency: Series connection of impellers allows for better efficiency in high head applications. Each impeller operates at a lower head, reducing the load on individual impellers and improving overall efficiency. This is because the power required to generate a high head in a single-stage impeller would be significantly higher, resulting in lower efficiency.
3. Compact Design: Series connection of impellers allows for a more compact pump design compared to parallel connection. This is because the series connection requires a single shaft to connect all the impellers, whereas parallel connection would require multiple shafts and bearings.
4. Balancing: Series connection allows for better hydraulic balancing of the impellers. As the fluid passes through each impeller, it imparts some axial thrust. In a series connection, the axial thrusts of all the impellers are balanced, resulting in smoother operation and reduced wear on bearings.
Conclusion:
In summary, multi-stage centrifugal pumps for high head applications have their impellers connected in series. This configuration allows for increased head, better efficiency, compact design, and improved hydraulic balancing.
Introduction:
Multi-stage centrifugal pumps are used to generate high head or pressure in various applications, such as water supply, irrigation, oil and gas industry, and power plants. These pumps consist of multiple impellers that are arranged in a specific configuration to achieve the desired head.
Impeller Connection:
The impellers in a multi-stage centrifugal pump are connected in series. This means that the discharge of one impeller is connected to the suction of the next impeller, and so on. In this configuration, the fluid passes through each impeller in a sequential manner, with the pressure increasing at each stage.
Reasons for Series Connection:
1.Increased Head: Connecting the impellers in series allows the pump to generate a higher head compared to a single-stage pump. Each impeller adds to the total head by increasing the pressure of the fluid. Thus, the total head is the sum of the heads produced by each impeller.
2. Efficiency: Series connection of impellers allows for better efficiency in high head applications. Each impeller operates at a lower head, reducing the load on individual impellers and improving overall efficiency. This is because the power required to generate a high head in a single-stage impeller would be significantly higher, resulting in lower efficiency.
3. Compact Design: Series connection of impellers allows for a more compact pump design compared to parallel connection. This is because the series connection requires a single shaft to connect all the impellers, whereas parallel connection would require multiple shafts and bearings.
4. Balancing: Series connection allows for better hydraulic balancing of the impellers. As the fluid passes through each impeller, it imparts some axial thrust. In a series connection, the axial thrusts of all the impellers are balanced, resulting in smoother operation and reduced wear on bearings.
Conclusion:
In summary, multi-stage centrifugal pumps for high head applications have their impellers connected in series. This configuration allows for increased head, better efficiency, compact design, and improved hydraulic balancing.
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To produce a high head multi-stage centrifugal pumps, the impellers ar...
If a centrifugal pump consists of two or more impellers, the pump is called a multistage centrifugal pump. The impeller may be mounted on the same shaft or on different shafts.
A multistage pump is having the following functions:
To produce high heads:
A multistage pump is having the following functions:
To produce high heads:
- For developing a high head, a number of impellers are mounted in series or on the same shaft.
N = Number of identical impellers mounted on the same shaft
Hm = Head developed by each impeller
Total head developed = N × Hm
The discharge passing through each impeller is the same.
To discharge a large quantity of liquid:
- For obtaining a high discharge, the pumps should be connected in parallel.
N = Number of identical pumps arranged in parallel
Q = Discharge from one pump
Total discharge = N × Q
Each of the pumps is working against the same head.
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