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Wear suitable clothes and protection such as gloves Please use also
a face protector.
• Use pliers.
• Never touch the parts of the pump that can be hot.
• At the end of the purge, close tight the air vent.
CAUTION!
Uncompleted gas purging can reduce significantly the lifeti-
me of the pump.
8.5 Electrical connection
The motor must be connected at set out in the circuit diagram in the
terminal box.
8.6 Checks before switching-on
Before switching-on of pump, make sure that
nobody can be endangered by this starting.
Before switching-on the pump unit, the following
points should be checked:
1. Is all pipework connected and are the unions tight?
2. Has the shaft seal been installed?
3. Are the supply lines, if any, to the shaft seal open?
4. Is the coupling aligned exactly?
5. Is the pump including the pipework filled properly?
6. Is the shut-off valve in the discharge line closed?
7. Is the shut-off valve in the suction line completely opened?
8. Is the motor ready for operation?
9. Is the direction of rotation of the motor correct? (Check by running
the motor for a short time)
10. Is the gland finger slightly tight? (A FIG. 7).
FIG. 7
8.7 Start-up operation
For starting proceed as follows:
- Open fully the valve on the suction side.
- Close the valve on the discharge side.
- Switch on the motor.
- Check the pressure gauges at the pressure measuring points If the
pumping pressure does not increase consistently with increasing
speed,
- switch off the motor again and vent the pump one more.
- After reaching operating speed, regulate the operating point of the
pump by adjusting the valve in the discharge line (see technical
data for permissible range of operation).
- For "running in" the packing, the gland should be tightened only
slightly (even in the case of considerable leakage initially). After
approx. 30 minutes tighten the gland to such an extent that it leaks
only slightly. Check it several times, until leakage from the packing is
about 20 to 40 drops a minute. In extreme operating conditions and
high temperatures this rate may be higher. Pumping against a clo-
sed valve in the discharge line is permitted only if a minimum out-
put via a bypass line is guaranteed.
- If the installation is protected with a pressure relief valve, ensure that
the pressure setting do not exceed the resistance of the pump
casing.
- The alignment of the pump / motor must be checked when the
functioning temperature is arisen.
8.8 Switching frequency
The permissible switching frequency is listed in the table bellow
accordingly the pump size:
Pump size
32-125, 32-160, 32-200, 32-250,
40-125, 40-160, 40-200, 40-250,
50-125, 50-160, 50-200, 65-125,
65-160, 65-200, 65-250, 80-160,
80-200, 80-250,100-160,
100-200, 100-250, 100-315,
125-200, 150-200, 150-250
40-315, 50-250, 50-315, 65-315,
80-315, 80-400, 100-400,
125-250, 125-315, 125-400,
150-315, 150-400, 150-500,
200-250, 200-315, 200-400,
200-500, 250-300, 250-315,
250-400, 250-500, 300-400,
300-500
8.9 Special instructions
During operation the following points must be
checked:
- Ensure that the pump runs without vibration.
- Control the liquid level in the suction line and/or inflow tank.
- Control the bearing temperature (max. temperature 100 °C).
Shaft sealing
Execution with stuffing box:
For correct operation of the shaft seal a slight leakage (20 - 40 drops
per minute) is essential. If the leakage is reduced too much by retigh-
tening the packing, the packing rings will be destroyed.
Execution with mechanical seal:
During running-in slight leakage may occur. If the pump is equipped
with an external flush, quench or heating, the flush, quench or heating
supply has to be switched on before the pump is started. The mecha-
nical seal must be allowed to cool before the next re-start.
CAUTION!
For executions with stuffing box: : If the leakage increases
considerably and cannot be adjusted by retightening the
gland, the packing is worn and must be replaced by a new one.
For executions with mechanical seal: : If the initial leakage does not
disappear within 5 minutes of operation, stop the pump, dismantle
the seal and check for damage of the seal faces and auxiliary sea-
ling.
8.10 Shutting-down
Before shutting down close the valve on the discharge side.
As soon as the pump stops, all the valves must be closed.
The valves of the auxiliary optional pipework connections, (quench,
heating, external flush), have to be closed in the last place. If there is
a risk of very low ambient temperatures, remove the pump and then
drain it using the threaded plug 90.30.
23
Maximum frequency of
switching on per hour
15
8
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