Omega
36
11.2 Trouble--shooting Table
Pump pressure too low
Pump pressure too high
Flow rate too high
Flow rate too low
Power consumption too high
Pump fails to pump liquid after being switched on
Pump ceases to pump liquid
Pump does not run smoothly (noise, vibrations)
Inadmissible temperature increase at pump /
seal casing
Bearing temperature too high
Exessive leakage at shaft seal
Drive overloaded
Leakage at pump
Cause Remedy
1)
F F F F F F F F F
Operating point B does not
lie at the calculated inter-
sections of Q and H
Re-- adjust operating point
F
Pump or piping incomple-
tely vented or not primed
Vent.
F F F F F F
Suction pipe or impeller
blocked
Clean impeller
Check plant for impurities
Remove deposits in pump and / or piping
Check strainer / suction opening
F F F
Formation of air pockets in
the piping
Correct suction conditions
Alter piping
F F F F F
Suction head too high
(NPSH
available
too low) /
water level too low
Check mode of operation
Correct suction conditions
Increase positive suction head
Increase back pressure by throttling
Install pump at a lower level
Alter intake pipe if resistances are too high
F F F F
Air is drawn in at shaft seal Clean sealing liquid line, possibly introduce
sealing liquid from an external source or
increase pressure
Check level of liquid in feed tank
Replace shaft seal
Replace shaft protecting sleeve
F F F F F
Wrong direction of rotation Interchange two phases of the power cable
Check electrical connections
Check impeller position, correct if neces -
sary
F F F
Speed too low Increase speed
1)
,
Check switchgear,
Fit larger impeller
1)
.
F F F F
Internals worn Check duty point / pump selection
Increase back pressure by throttling
Check medium handled for contamination
by chemicals and solids c ontent
Replace worn components
F F
Pump pressure is lower
than specified in the order
Re-- adjust operating point
Increase back pressure by throttling.
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