Troubleshooting - ProMinent DULCOflex DFAa 003 Assembly And Operating Instructions Manual

7.3 Troubleshooting

Problem
Increased pump temperature
Reduced flow or pressure
Vibration in the pump
Short operational lifetime of the
hoses
Pump hose pulled into the pump
housing
Maintenance, repair, malfunctions, disposal and spare parts
8. Mount the pump hoses from both the discharge and suction
sides
9. Open all of the valves
Possible cause
Pump hose has no lubricant
Increased product temperature
Insufficient or poor suction condi‐
tions
Pump speed too high
Valves on discharge and or suc‐
tion side completely or partially
closed
Pump hose insufficiently com‐
pressed
Pump hose rupture (the product
leaks out into the housing)
Partial blockage of the suction line Clean pipe
Insufficient product quantity in
storage container
Insufficient diameter on the suc‐
tion side
Suction line too long
High viscosity of medium
Air introduction in the suction con‐
nections
Pump speed too high
Pump base plate loose
Chemical stress
High pump speed
High conveying temperature
High operating pressure
Pump cavitations
High inlet pressure (> 3 bar)
Pump hose filled with deposits
Solution
Lubricate pump hose
Reduce product temperature
Check suction line for blockages
Reduce pump speed
Open valves
Check roller fastening
Exchange pump hose
Fill storage container or exchange
pump
Increase the diameter on the suc‐
tion side, as far as possible
Shorten the suction line, as far as
possible
Reduce viscosity, as far as pos‐
sible
Check connections and accesso‐
ries for air tightness
Reduce pump speed
Fasten base plate
Check the compatibility of the
hose with the liquid being con‐
veyed, the cleaning fluid and the
lubricant
Reduce pump speed
Reduce product temperature
Reduce operating pressure
Check the suction conditions
Reduce inlet pressure
Clean or replace the pump hose
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