200 180 Performance Curve 160 140 Head Use this line if the total pump head is known. BEP Efficiency (%) 120 70 (ft) Efficiency 60 100 50 80 15 40 60 30 10 40 bhp 20 bhp 5 20 Use this line if the flow rate is known. 10 0 0 0 0 50 100 150 200 250 300 Flow (gpm)
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The graph shows three main curves: "Performance Curve" (Head vs. Flow), "Efficiency" (Efficiency vs. Flow), and "bhp" (Brake Horsepower vs. Flow). The x-axis is "Flow (gpm)" (gallons per minute). The left y-axis is "Head (ft)" (feet). The right y-axis has two Show more…
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A 9 -in.-diameter centrifugal pump, running at 900 rpm with water at $68^{\circ} \mathrm{F}$ generates the following performance data: $$\begin{array}{lcrrrrr} \text { Flow rate, } Q(\mathrm{cfm}) & 0 & 200 & 400 & 600 & 800 & 1000 \\ \text { Total head, } H(\mathrm{ft}) & 23.0 & 22.3 & 21.0 & 19.5 & 17.0 & 12.5 \\ \text { Power input, } \mathscr{P}(\mathrm{hp}) & 3.13 & 3.50 & 4.06 & 4.47 & 4.88 & 5.09 \end{array}$$ Plot the performance curves for this pump; include a curve of efficiency versus volume flow rate. Locate the best efficiency point. What is the specific speed for this pump?
Data from tests of a water suction pump operated at 2000 rpm with a 12 -in. diameter impeller are $$\begin{array}{lrrrrr} \text { Flow rate, } Q(\mathrm{cfm}) & 36 & 50 & 74 & 88 & 125 \\ \text { Total head, } H(\mathrm{ft}) & 190 & 195 & 176 & 162 & 120 \\ \text { Power input, } \vartheta(\mathrm{hp}) & 25 & 30 & 35 & 40 & 46 \end{array}$$ Plot the performance curves for this pump; include a curve of efficiency versus volume flow rate. Locate the best efficiency point and specify the pump rating at this point.
Use data from Appendix $D$ to choose points from the performance curves for a Peerless horizontal split case Type $16 \mathrm{A} 18 \mathrm{B}$ pump at 705 and 880 nominal rpm. Obtain and plot curve-fits of total head versus delivery for this pump, with an 18.0 -in.-diameter impeller.
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