FLOWTECH flowboost F.H Operation And Maintenance Manual page 14

Insufficient flow 4a. Pipes and accessories
with diameter too small
causing excessive loss of
head
4b. Presence of deposits
or solid bodies in the
internal passages of the
rotor
4c. Rotor deteriorated
4d. Worn rotor and pump
case
4e. Excessive viscosity of
the liquid pumped (if other
than water)
4f. Incorrect direction of
rotation
4g. Suction head
excessive in relation to the
suction capacity of pump
4h. Suction pipe too long
Noise and vibrations 5a. Rotating part
from the pump unbalanced
5b. Worn bearings
5c. Pump and pipes not
firmly attached
5d. Flow too strong for the
diameter of the delivery
pipe
5e. Functioning in
cavitation
5f. Unbalanced power
supply
5g. Incorrect alignment of
pump-motor unit
Leakage from the 6a. The mechanical seal
mechanical seal has functioned when dry
or has stuck
6b. Mechanical seal
scored by presence of
abrasive parts in the liquid
pumped
6c. Mechanical seal
unsuitable for the type of
application
6d. Slight initial drip during
filling or on first start-up
In cases 6a), 6b) and 6c), replace the seal, if necessary contact an authorised service center
4a. Use pipes and accessories suitable for the specific
application
4b. Clean the rotor and install a suction filter to prevent
other foreign bodies from entering
4c. Replace the rotor, contact Flowtech
4d. Replace the rotor and the pump casing
4e. The pump is unsuitable
4f. Invert the electrical connections on the terminal board
or control panel
4g. Try to close the feeder gate partially and/or reduce
the difference in level of the pump and the liquid being
aspirated
4h. Bring the pump closer to the suction tank so as to use
a shorter pipe. If necessary use a pipe of a wider diameter
5a. Check that no solid bodies are obstructing the rotor
5b. Replace the bearings
5c. Anchor the delivery and suction piping as needed
5d. Use bigger diameters or reduce the pump flow
5e. Reduce the flow by adjusting the feeder gate and/or
using pipes with a bigger internal diameter. See point 4g)
too
5f. Check that the mains voltage is right
5g. If necessary, the unit must be re-aligned
6a. Make sure that the pump casing (and the suction pipe
if the pump is not self-priming) are full of liquid and that all
the air has been expelled. See point 5 e) too.
6b. Install a suction filter and use a seal suited to the
characteristics of the liquid being pumped.
6c. Choose a seal with characteristics suitable for the
specific application
6d. Wait for the seal to adjust to the rotation of the shaft. If
the problem persists, see points 6a), 6b) or 6c) or contact
an authorised service center.
14