PumpingQuestion 1 of 20

A lift station has two identical centrifugal pumps that can run in series to push wastewater to a high point. Use the pump curve (for ONE pump) and the system curve table provided. When both pumps run in series, the combined pump head at a given flow equals the sum of each pump’s head at that same flow. Assume both pumps are the same model and operate at the same speed. Based on the tables, what is the approximate operating point (flow and total dynamic head, TDH) when BOTH pumps are running in SERIES? (Extra info not needed: 1 MGD = 694.4 gpm.)

Pump Curve
Flow (gpm)	Head (ft)
0	120
500	110
1,000	95
1,500	75
2,000	50
2,500	20

System Curve
Flow (gpm)	Head (ft)
0	30
500	45
1,000	65
1,500	90
2,000	120
2,500	155

A) About 1,500 gpm at about 150 ft TDHB) About 2,660 gpm at about 82 ft TDHC) About 1,330 gpm at about 82 ft TDHD) About 1,875 gpm at about 113 ft TDH

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