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