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Given below are two statements
Statement (I) : Specific speed of the pump is directly proportional to the square root of head.
Statement (II) : The specific speed for a single impeller centrifugal pump varies between 300 to 5000.
In light of the above statements, choose the most appropriate answer from the options given below.
EXPLANATION
Fluid Dynamics & Vapour Compression
- Specific Speed of Centrifugal Pumps:
- Statement (I): Specific speed of the pump is directly proportional to the square root of head. $\implies$ Incorrect.
- The dimensionless/standard specific speed of a pump is given by:
- Specific speed is directly proportional to the square root of discharge ($\sqrt{Q}$) and inversely proportional to head raised to the power 3/4 ($H^{3/4}$).
- Statement (II): The specific speed for a single impeller centrifugal pump varies between 300 to 5000. $\implies$ Correct.
- In US customary units (rpm, gpm, ft), single-impeller radial centrifugal pumps operate between 500 and 4000 (up to 5000 for mixed flow).
- Conclusion: Statement (I) is incorrect but Statement (II) is correct (Option 4).
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