Question
What type of pump is shown in Fig. P11.5? How does it operate?
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First, we need to identify the pump shown in Fig. P11.5. Unfortunately, since the figure is not provided in the question, we cannot determine the exact type of pump. Show more…
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The centrifugal pump shown in Fig. $\mathrm{P} 12.24$ is not self- priming. That is, if the water is drained from the pump and pipe as shown in Fig. $\mathrm{P} 12.24(a),$ the pump will not draw the water into the pump and start pumping when the pump is turned on. However, if the pump is primed [i.e., filled with water as in Fig. $\mathrm{P} 12.24(b)],$ the pump does start pumping water when turned on. Explain this behavior.
The performance characteristics of a certain centrifugal pump are deternined from an experimental setup similar to that shown in Fig. $12.10 .$ When the flowrate of a liquid $(S G=0.9)$ through the pump is $120 \mathrm{gpm}$, the pressure gage at ( 1 ) indicates a vacuum of $95 \mathrm{mm}$ of mercury and the pressure gage at (2) indicates a pressure of $80 \mathrm{kPa}$. The diameter of the pipe at the inlet is $110 \mathrm{mm}$ and at the exit it is $55 \mathrm{mm}$. If $z_{2}-z_{1}=0.5 \mathrm{m},$ what is the actual head rise across the pump? Explain how you woud estimate the pump motor power requirement.
The performance characteristics of a certain centrifugal pump are determined from an experimental setup similar to that shown in Fig. $12.10 .$ When the flowrate of a liquid $(S G=0.9)$ through the pump is $120 \mathrm{gpm},$ the pressure gage at (1) indicates a vacuum of $95 \mathrm{mm}$ of mercury and the pressure gage at (2) indicates a pressure of 80 kPa. The diameter of the pipe at the inlet is $110 \mathrm{mm}$ and at the exit it is $55 \mathrm{mm} .$ If $z_{2}-z_{1}=0.5 \mathrm{m},$ what is the actual head rise across the pump? Explain how you would estimate the pump motor power requirement.
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