Why is centrifugal pump discharge line smaller in diameter than suction line?
Answers
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07/01/2015
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A:
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Yongming Zhang, HQCEC, 13439348666@139.com
The line diameter is decided by pressure drop requirement, due to the NPSH requirement for centrifugal pump, that implies a smaller pressure drop limit for the pump suction line; but as the fluid at discharge line is with higher pressure, it allows a higher pressure drop in discharge line. Through the pipe size calculation, you will find the smaller pressure drop the larger diameter of pipe, and the larger pressure drop the smaller diameter of pipe.
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06/01/2015
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A:
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Ralph Ragsdale, Ragsdale Refining Courses, ralph.ragsdale@att.net
Read up on Net Positive Suction Pressure (NPSH) and note the importance of the height of the liquid level in the pump suction and the pressure drop in the suction piping. Note that if the liquid level is at the bottom of a column or an overhead receiver with vapor flowing from the drum, two of the factors in the NPSH calculation will cancel each other out. If the service is booster pump (downstream from another pump), NPSH is not as important.
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