Troubleshooting - ProMinent Dulco flex DFBa Series Operating Instructions Manual

Maintenance, repair, malfunctions, disposal and spare parts
7.3

Troubleshooting

Problem
Increased pump temperature
Reduced flow or pressure
Vibrations on pumps and pipelines The pipes are not correctly
Short operational lifetime of the
hoses
32
8. Turn the rotor with the help of the motor so that the remaining
roller presses against the pump hose
9. Re-attach the second roller with spacer plates back onto the
rotor
10. Attach the front cover to the pump housing
11. Mount the pump hoses from both discharge and suction
sides
12. 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
suction side completely or partially
closed
Pump hose insufficiently
compressed
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
suction side
Suction line too long
High viscosity of medium
Air introduction in the suction
connections
fastened
Pump speed too high
Insufficient nominal width of the
pipes
Pump base plate loose
Pulsation dampers insufficient or
missing
Chemical exposure
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
suctions side, as far as possible
Shorten the suction line, as far as
possible
Reduce viscosity, as far as
possible
Check connections and accesso‐
ries for air tightness
Fasten pipes correctly (e.g. wall
brackets)
Reduce pump speed
Increase nominal width
Fasten base plate
Install pulsation dampers on
suction and / or discharge side.
Check the compatibility of the
hose with the liquid being
conveyed, the cleaning fluid and
the lubricant