8
Pump Overloads Driver
Speed too high.
Head lower than rated, hence, pumping too much water. (This is valid for low specific speed
pumps).
Mechanical defects: stuffing boxes too tight, shaft bent, rotating element binds.
Rubbing due to foreign matter in the pump between the case rings and the impeller.
Pump Vibrates
Misalignment.
Foundation not sufficiently rigid.
Impeller partially clogged.
Mechanical defects: bent shaft, rotating element binds, bearings worn, coupling defective.
Suction and discharge pipes not anchored.
Pump cavitating from too high a suction lift.
Air entrainment in the pump suction due to low submergence.
