1-28 - BIE 5110/6110 Sprinkle & Trickle Irrigation Fall...

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BIE 5110/6110 Sprinkle & Trickle Irrigation Fall Semester, 2004 Assignment #6 (100 pts) Pump Characteristic Curves Due: 20 Oct 04 Given: A graph of pump characteristic curves for Cornell Model 4HS Notice the abscissa scale and the note saying that the pump curves are “flat” from Q = 0 to Q = 100 gpm The desired operating point on your system curve is Q = 550 gpm at TDH = 72 ft The pump will take water from a large concrete-lined canal with water surface which can vary from 1,330 to 1,333 ft above mean sea level The suction side of the pump has a screen, 8.0 ft of 6-inch SDR41 IPS PVC pipe, and one 45-degree elbow The pump itself is located at an elevation of 1,338 ft above mean sea level The crop to be grown in the irrigated field is alfalfa Required: 1. What is the nominal pump speed (RPM)? 2. What is the pump efficiency at the desired operating point? 3. What is the WHP at the desired operating point? 4. What is the calculated BHP at the desired operating point? Does it match the BHP value given by the manufacturer on the graph? 5. Select an impeller diameter (inches) from the options given on the graph 6. What is the required pump speed (RPM) such that the desired operating point is the actual operating point?
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1-28 - BIE 5110/6110 Sprinkle & Trickle Irrigation Fall...

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