FLOWTECH flowboost F.V Operation And Maintenance Manual page 19

Pump blocked
The pump functions
but no water comes
out
Insufficient flow
flowboost
2a. Prolonged periods of
inactivity with formation
of rust inside the pump
2b. Presence of solid
bodies in the pump rotor
2c. Bearings seized
3a. Possible infiltration
of air from suction tube
connections, drain plugs
or filling of pump or
from the gaskets of the
suction pipe
3b. Foot valve blocked
or suction pipe not fully
immersed in liquid
3c. Suction filter blocked 3c. Clean the filter, if necessary, replace it. See point 2a)
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 4h. Bring the pump closer to the suction tank so as to
F.V Pump Manual
2a. Rotation may be started directly from the pump shaft
or from the joint (remember to turn off the electricity
supply first ) or contact an authorised service centre
2b. If possible, dismantle the pump casing and remove
any solid foreign bodies inside the rotor, if necessary
contact an authorised service centre
2c. If the bearings are damaged replace them or if
necessary contact an authorised service centre
3a. Check which part is not tight and seal the connection
adequately
3b. Clean or replace the bottom valve and use a suction
pipe suitable for the application
also.
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, if necessary, contact an authorised
service center
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
use a shorter pipe. If necessary use a pipe of a wider
diameter
19