The operating characteristics of a screw pump are shown in the following table. Plot the water level in the influent chamber on the horizontal axis versus capacity and efficiency on the vertical axis. Use a second axis in the same graph to plot efficiency. When the water level is 60 percent of total, what is the pump operating capacity? Over what range of pump capacity is the efficiency greater than 70 percent?
Water Level in Influent Chamber (in.) | Pump Capacity (gpm)- | Pump Efficiency (percent) |
0 | 0 | 0 |
12 | 60 | 45 |
16 | 120 | 54 |
23 | 240 | 63 |
28 | 360 | 68 |
32 | 480 | 71 |
35 | 600 | 73 |
38 | 720 | 74 |
43 | 960 | 75 |
18 | 1200 | 75 |
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