Operation and Maintenance Manual
13/13
Reverse rotating direction.
Check each impeller and other parts for
loose and retighten it if loosened.
-
Abnormal wear of pump
component.
-
Overhaul and repair the pump.
Overloaded driver.
Too high rotational speed.
-
Adjust governor.
Pump running significantly
deviated
from
its
rated
condition.
Adjust discharge valve opening degree.
-
Inclusion
of
sludge
and
foreign matter in pump.
Once stop and restart.
Overhaul and clean.
High specific gravity and
viscosity of fluid.
Reduce
discharge
rate
up
to
the
allowable limit of driver.
Reduce the number of impeller
stage,
refinish
the
impeller
diameter, or increase motor output.
Over
tightening
packing
rings.
Adjust to proper clamping torque.
-
Overheated
bearing.
Deviated
shaft
center
alignment.
-
Re-align.
Additional load to bearing
by piping.
Checking the alignment at flange joint.
Change pipe support if necessary.
Damaged bearing.
Check, repair or replace.
Overheated gland.
Too tightened packing ring.
Once
loosen
the
gland
and
then
gradually
re-tighten
it
to
increase
leakage.
Replace packing rings if necessary.
Too
high
sealing
water
pressure in gland.
Close a little sealing water cock a little.
Lower sealing water pressure.
Insufficient
gland
sealing
water rate.
Raise water rate a little.
-
Vibration, abnormal
noise.
Pertly clogged impeller.
Once stop and restart.
Overhaul and clean.
Break of impeller.
-
Overhaul and replace.
Too small discharge rate.
-
Operate
at
around
specified
discharge rate.
Deviated alignment of pump
to driver.
-
Re-align.
Air invasion, cavitation.
-
Inspect and clean suction line.
Running at a point of critical
speed.
As
it
possibly
happens
of
speed
changing, operate at high speed or low
speed side.
-
Damaged bearing.
-
Inspect and repair or replace.
Damaged coupling rubber.
-
Replace with spare rubber.
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