Omega
38
Trouble--shooting Table
Pum
p
pressure
too
low
Pum
p
pressure
too
high
Flow
rate
too
high
Flow
rate
too
low
Pow
er
consum
ption
too
high
P
um
p
fa
ils
to
pum
p
liqui
d
af
ter
bei
ng
sw
itc
hed
on
Pum
p
ceases
to
pum
p
liquid
Pum
p
does
not
run
sm
oothly
(noise,
vibrations)
Inadm
issible
tem
perature
increase
at
pum
p
/
seal
casing
Bearing
tem
perature
too
high
Exessive
leakage
at
shaft
seal
D
rive
overloaded
Leakage
at
pum
p
Cause
Remedy
1
)
F
F
Gland cover, seal cover
tightened incorrectly,
wrong packing material
Alter
Replace
Correct
Replace gland packing
Replace worn components
F
F
Lack of cooling liquid or
cooling liquid chamber con-
taminated
Check flushing / sealing liquid pressure
Clean sealing liquid line, possibly introduce
sealing liquid from an external source or
increase its pressure
Increase cooling liquid flow
Clean cooling liquid line.
F
F
Pump mis--aligned or reso-
nance vibrations in the pi-
ping
Re--align pump / drive
Check piping connections and pump
mounting, if necessary, improve mounting
of piping
Apply vibration--damping measures
F
Excessive axial thrust
Check duty point / pump selection
Check mode of operation
Check suction -- side flow.
F
Too little, too much or un-
suitable lubricant
Clean bearing
Replace lubricant
Top up, reduce or change lubricant
F
F
F
F
Motor is running on two
phases only
Replace defective fuses
Check electrical connections
Check switchgear.
F
F
F
Rotor is out of balance
Clean rotor
Check run--out, straighten if necessary
Re--balance rotor.
F
F
F
Bearings damaged
Replace / change
F
F
Flow rate too low
Re--adjust operating point
Fully open shut--off valve in the intake pipe
Fully open shut--off valve in the discharge
pipe
Recalculate or measure the hydraulic los-
ses H
V
.
1
) Consult KSB