PumpingQuestion 1 of 20

A centrifugal pump has been moving wastewater from a wet well to a treatment unit. After inspection, the impeller is found to be worn. Use the table data (original pump curve, worn pump curve, and the system curve). Assume the piping/system curve does NOT change and pump speed stays the same. Based on where each pump curve intersects the system curve (operating point), how will the operating point change when the impeller is worn? Note: Plant flow data (extraneous): average flow is 1.3 MGD (1 MGD = 694.4 gpm).

Pump Curve
Flow (gpm)	Head (ft)
0	100
400	92
600	86
800	78
1,000	68
1,200	56

Worn Pump Curve
Flow (gpm)	Head (ft)
0	90
400	82
600	76
800	68
1,000	58
1,200	46

System Curve
Flow (gpm)	Head (ft)
0	40
400	48
600	56
800	66
1,000	78
1,200	92

A) Flow increases and head decreases at the new operating point.B) Flow decreases and head increases at the new operating point.C) Flow increases and head increases at the new operating point.D) Flow decreases and head decreases at the new operating point.

Practice Pumping Questions