VERDER Verderflex Rapide Original Operating Manual page 25

8.1 Pump Malfunctions (continuous)
Rapide 5000 Pump Troubleshooting List:
Problem Cause
Ratio of inner diameter/wall thickness too large
for the application (tube too 'soft').
Viscosity too high.
Suction lift too high, resulting in tube not fully
Low Flow / Low
returning to fully round.
Discharge Pressure
Tube wall thickness does not match the specifi-
cations of the rotor assembly.
Discharge pressure too high, causing excessive
backflow.
Using non-standard tubing.
Tube blockage.
Tube not installed correctly.
Tube walks
through pump
Tube wall thickness does not match the specifi-
head
cations of the rotor assembly.
Premature tube fail- Tube wall thickness does not match the specifi-
ure cations of the rotor assembly.
Tube wall thickness does not match the specifi-
cations of the rotor assembly.
Excessive noise
Pulsation
Tube Burst Not De-
Contamination of the optical sensor. (if fitted)
tected
Table 9 Rapide 5000 Pump Troubleshooting List
Rapide
Solution
Use thicker wall tube with the same inner diameter. This
will require a different rotor assembly.
Run pump slower with larger inner diameter tube.
Check pipework dimensions and layout - revise as
required.
Run the pump slower.
Use thicker wall tube. This will require a different rotor
assembly.
Revise pipework.
Use thicker wall tube with the same inner diameter. This
will require a different rotor assembly.
Suction line too long or tube internal diameter too small.
Revise pipework.
Purchase appropriate tubing or rotor assembly or
change tube wall thickness.
Rotor assembly will discharge more pressure in the
clockwise direction.
Reduce discharge pressure.
Revise pipework.
Use Verderflex approved genuine tubing.
Check tube for obstructions.
Check installation of tube.
Purchase appropriate tubing or rotor or change tube wall
thickness.
Purchase appropriate tubing or rotor or change tube wall
thickness.
Purchase appropriate tubing or rotor or change tube wall
thickness.
Check pipework dimensions and revise as required,
eliminate small radius bends.
Clean contamination from the surface of the tube burst
sensor if fitted. (→ Figure 14 Tube Burst Detector)
2.0v-11.2019 25 | Page