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Dansk Centrifugalpumpefabrik
Installation, Operation and Maintenance Instructions
Pump type W
7
Fault Finding Chart
FAULTS
SYMPTOMS
Pump not primed
Pump or intake pipe not completely filled with liquid
Suction lift too high
Insufficient margin between intake pressure and vapor pressure
Excessive amount of air or gas in liquid
Air pocket in intake pipe
Air leaks into intake pipe
Inlet valve too small
Inlet valve partially clogged
Inlet pipe insufficiently submerged
Blocked inlet
Inlet pipe too small or length of inlet pipe too long
Speed too low
Speed too high
Wrong direction of rotation
Total head of system higher than design head
Total head of system lower than design head
Specific gravity of liquid different from design value
Viscosity of liquid different from design value
Operation of very low capacity
Entrained air in pump
Badly installed pipeline or gaskets
Misalignment
Foundations not rigid
Shaft bent
Rotating part rubbing stationary part
Motor bearing worn
Impeller damaged or worn
Shaft seal improperly installed
Shaft running off-center because of worn bearings or misalignment
Impeller out of balance
Foreign object in impeller
Excessive thrust caused by mechanical failure inside the pump
Before attempting to diagnose any fault, make sure that the electricity supply has been switched off.
Discharge
Reduced
Insufficien
Pump
failure
discharge
t pressure
loses
delivery
prime
PROBABLE FAULTS
23 of 41
Excessive
Vibration
Short life
Overheat
horsepow
and noise
of motor
of motor
er
from
bearings
required
pump
Hopper
overflow
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