In Example 12.3, how will the maximum height, z₁, that the pump can be located above the water surface change if the water temperature is decreased to 40 °F?

Example 12.3

Net Positive Suction Head

GIVEN A centrifugal pump is to be placed above a large, open water tank, as shown in Fig. 12.13, and is to pump water at a rate of 0.5 ft³/s At this flowrate the required net positive suction head, NPSH_R, is 15 ft, as specified by the pump manufacturer. The water temperature is and atmospheric pressure is 14.7 psi. Assume that the major head loss between the tank and the pump inlet is due to filter at the pipe inlet having a minor loss coefficient K_L = 20. Other losses can be neglected. The pipe on the suction side of the pump has a diameter of 4 in.

FIND Determine the maximum height, z₁, that the pump can be located above the water surface without cavitation. If you were required to place a valve in the flow path, would you place it upstream or downstream of the pump? Why?

 

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Status NEW Posted 20 May 2017 04:05 PM My Price 8.00

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