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Lecture 25.pptx

Lecture 25.pptx - Lecture 25 CBE 218 Fluid Mechanics April...

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Lecture 25 CBE 218 Fluid Mechanics April 5, 2015
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Centrifugal pump
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Centrifugal pump Pump head = h (height to which the pump will lift a fluid at a given flow rate. h =P 4 -P 1 / g = 2 (r 3 2 -r 2 2 )/g + (V 1 2 -V 2 2 )/2g – ( F 1-2 + F 3-4 )/g Course outcome- Understand the performance of a centrifugal pump, including the concept of net positive suction head (NPSH), and is able to apply that knowledge to design and predict the performance of a pump in a piping system.
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Example problem- A centrifugal pump has inlet pipe size 2 in, outlet pipe size 1.5 in, impeller diameter (i.d) 2 in and outer diameter (o.d) of 6.75 in and rotational velocity of 1800 rpm. What is the pump head for a volumetric flow rate of 100 gpm?
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Net-Positive-Suction-Head (NHSH) The height or elevation that must be large enough to prevent boiling of a fluid. NPSH (available) = NPSH a = The absolute pressure at the suction port of the pump NPSH (required) = NPSH R = Minimum pressure required at the suction port of the pump
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