Goulds Pumps VRS - IOM - Manual (Page 28)

MOTOR OVERLOAD
•
Speed too high
•
Total head lower than pump rating resulting in
increased flow
•
Liquid being pumped has higher specific gravity than
that for which it is rated
•
Mechanical defects: bent shaft, worn bearings, worn
impeller or other wet end parts
•
Solids locked in and around impeller
•
Rubbing or binding of rotating elements
PUMP VIBRATION
•
Foundation not sufficiently rigid
•
Impeller partially blocked causing imbalance
•
Misalignment of thrust housing - housing cocked
•
Mechanical defects: bent shaft, worn bearings, worn
impeller
WATER HAMMER
Water hammer is a high pressure surge within a closed pipe
system, created by a rapid change in the flowrate. The most
common is the sudden opening or closing of a valve or
other flow control device. Rapid changes in flowrate can
also occur when there is a sudden change in pump speed.
Extensive damage to the pump and pipeline can result from
water hammer.
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VRS IOM - 5/08