FLOWTECH flowpac compact 311S Operation And Maintenance Manual page 14

4. 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 and/or in the
diffusers
4c. Rotor deteriorated
4d. Worn rotor and
diffusers
4e. Excessive lowering
of the
dynamic level of the well
4f. Incorrect direction of
rotation
4g. Leaking from delivery
pipe
4h. Presence of
dissolved gases
in the water
5. Noise and 5a. Rotating part
vibrations from unbalanced
the pump
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
6. Leakage from 6a. The mechanical seal
the mechanical has functioned when dry
seal or has stuck
6b. Mechanical seal
scored by presence of
abrasive parts in the
liquid pumped
In cases 6a), and 6b), replace the seal, if necessary contact an authorised service center
4a. Use pipes and accessories suitable for the
specific application
4b. Extract the pump and contact an authorised
service center
4c. To replace the rotors contact an authorised
service center
4d. Contact an authorised service center to replace
the rotors and the sealing rings of the diffusers, or
diffusers themselves if worn
4e. Increase the depth of immersion of the pump as
far as compatible with pump characteristics, reduce
the flow requested by narrowing the suction valve.
Pump too big for the dynamic level of the well
4f. See 2e)
4g. Locate the points in which the delivery pipe is
leaking, if located in the vertical section of the well,
extract the pump and repair the pipe as needed.
4h. Contact an authorised service center.
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
6a. Make sure that the pump casing is full of liquid
and that all the air has been expelled.
6b. Use a seal suited to the characteristics of the
liquid being pumped.
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