The operating manual of any centrifugal pump often starts with a general statement,
“Your centrifugal pump will give you completely trouble free and satisfactory service only
on the condition that it is installed and operated with due care and is properly maintained.”
Despite all the care in operation and maintenance, engineers often face the statement
“the pump has failed i.e. it can no longer be kept in service”. Inability to deliver the desired
flow and head is just one of the most common conditions for taking a pump out of service.
There are other many conditions in which a pump, despite suffering no loss in flow or head,
is considered to have failed and has to be pulled out of service as soon as possible. These
include seal related problems (leakages, loss of flushing, cooling, quenching systems, etc),
pump and motor bearings related problems (loss of lubrication, cooling, contamination of
oil, abnormal noise, etc), leakages from pump casing, very high noise and vibration levels,
or driver (motor or turbine) related problems.
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