8
Pump Overloads Driver
Speed too hig
h.
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 an
d 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 cav
itating from too high a suction lift.
Air entrainment in the pump suction due to low submergence.
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