Pump NRV faulty
Frequent
starts and
stops
The water level electrodes
or level switches have not
been installed correctly
Riser pipe leakage
Check and repair riser pipe
Lift pump and rectify NRV
Adjust the intervals of the
electrodes to ensure suitable
time between the cutting-in
and cutting-out of the pump.
If the intervals between
stop/start cannot be changed
automatically, the pump
capacity may be reduced by
throttling the discharge valve
changed
Pull out the pump and clean
or replace the non-return
valve
The non-return valve is
leaking or stuck half open
Long
period until
water flow
after start
Increase the installation
depth of the pump, throttle
the pump or replace it with a
smaller model to obtain a
smaller capacity
The pump is oversized for
borehole
Water hammer
Fit a surface non-return valve
and a diaphragm tank on
the surface delivery piping
Loud noise
in the
pipework
Pump cavitation due to low
system head resulting in
operation at insufficient
pressure
Throttle the pump or replace
it with a lower pressure
alternative
Mechanical
damage to
pump and
motor
13
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