English (GB)
26
11.5 Startup
Before starting the pump, completely open the
isolating valve on the suction side of the pump and
leave the isolating valve on the discharge side
almost closed.
Start the pump.
Vent the pump during startup by loosening the air
vent screw in the pump head/cover until a steady
stream of liquid runs out of the vent hole.
When the pipework has been filled with liquid, slowly
open the isolating valve on the discharge side until it
is completely open.
Check the overload by measuring the motor current
consumption and comparing the value with the
nominal current stated on the motor nameplate. In
case of overload, throttle the valve on the discharge
side until the motor is no longer overloaded.
It is advisable always to measure the motor current
consumption during startup.
11.6 Shaft seal run-in period
The seal faces are lubricated by the pumped liquid,
meaning that there may be a certain amount of
leakage from the shaft seal. When the pump is
started for the first time, or when a new shaft seal is
installed, a certain run-in period is required before
the leakage is reduced to an acceptable level. The
time required for this depends on the operating
conditions, i.e. every time the operating conditions
change, a new run-in period will be started.
Under normal conditions, the leaking liquid will
evaporate. As a result, no leakage will be detected.
Liquids such as kerosene will not evaporate, and
drops will be visible, but this is not a shaft seal
failure.
11.7 Start/stop
11.8 Reference readings of monitoring
equipment
We recommend taking initial readings of these
parameters:
• inlet and outlet pressure (use pressure gauges).
The readings can be used as reference in case of
abnormal operation.
Warning
Pay attention to the orientation of the vent
hole to ensure that the escaping water
does not cause personal injury or damage
to the motor or other components.
In hot-liquid installations, pay special
attention to the risk of personal injury
caused by scalding hot liquid.
In cold-liquid installations, pay special
attention to the risk of personal injury
caused by the cold liquid.
Warning
If the pump is fitted with a motor with an
output selected on the basis of a specific
maximum flow rate, the motor may be
overloaded if the differential pressure is
lower than anticipated.
At the moment of start, the input current of
the pump motor is up to six times higher
than the full-load current stated on the
motor nameplate.
Frame size
Max. number of starts/hour
Number of poles
246
56-71 100 250 350
80-100 60 140 160
112-132 30 60 80
160-180 15 30 50
200-225 8 15 30
250-315 4 8 12
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