17
A.0500.301/314.A – IM-TW/10.00 GB (0401)
2.7
Trouble shooting chart
Symptom
Causes
Actions
N
o
Irregular
L
o
w
Pump
Motor
Exessive
Exessive
Noise/,
Seizure
Pump
flow
flow
capacity
over-
over-
rotor
seal
Vibra-
stalls on
heats
heats
wear
wear
tions
start up
•
Incorrect direction of rotation
Reverse motor
•
Pump not primed
Expel gas from suction line/pump chamber and prime
•
•
•
•
Insufficient NPHS available
Increase suction line dia and static suction head
Simplify suction line and reduce length
••
•
Product vapourising in suction line
Reduce pump speed and product temperature
••
•
Air entering suction line
Remake pipework joints
•
•
•
•
Gas in suction line
Expel gas from suction line/pump chamber
••
•
Insufficient static suction head
Raise product level to increase static suction head
••
•
•
Product viscosity too high
Decrease pump speed/increase product temperature
•
Product viscosity too low
Increase pump speed/decrease product temperature
••
•
•
•
Product temperature too high
Cool product/pumping chamber
••
Product temperature too low
Heat product/pumping chamber
••
•
•
Unexpected solids in product
Clean the system/fit strainer on suction side of pump
••
•
•
•
•
•
Discharge pressure too high
Check for blockages/simplify discharge line
••
•
•
•
Rotor case strained by pipework
Check pipe alignment/support pipework
••
Pump speed too high
Decrease pump speed
•
Pump speed too low
Increase pump speed
••
•
•
•
•
Seal flush inadequate
Increase seal flush to required pressure/flow
••
•
•
•
•
•
Bearing/timing gear wear
Replace worn components