CAUTION
Abnormal noises, vibrations, temperatures or leakage
Damage to the shaft!
▷
Switch off the pump (set) immediately.
▷
Eliminate the causes before returning the pump set to service.
✓
The system piping has been cleaned.
✓
The pump, suction line and inlet tank, if any, have been vented and primed with
the fluid to be handled.
✓
The lines for priming and venting have been closed.
CAUTION
Start-up against open discharge line
Motor overload!
▷
Make sure the motor has sufficient power reserves.
▷
Use a soft starter.
▷
Use speed control.
1. Fully open the shut-off element in the suction head/suction lift line.
2. Close or slightly open the shut-off element in the discharge line.
3. If a mechanical seal with quench is used, make sure that the quench liquid
circulates properly.
4. Start up the motor.
5. Immediately after the pump has reached full rotational speed, slowly open the
shut-off element in the discharge line and adjust it to comply with the duty
point.
6. When the operating temperature has been reached and/or in the event of
leakage, check the connection of the individual stage casings with the pump
casing and re-tighten, if necessary.
6.1.4 Checking the shaft seal
The mechanical seal only leaks slightly or invisibly (as vapour) during operation.
Mechanical seals are maintenance-free.
6.1.5 Shutdown
CAUTION
Heat build-up inside the pump
Damage to the shaft seal!
▷
Depending on the type of installation, the pump set requires sufficient after-run
time – with the heat source switched off – until the fluid handled has cooled
down.
✓
The shut-off element in the suction line is and remains open.
1. Close the shut-off element in the discharge line.
2. Switch off the motor and make sure the pump set runs down smoothly to a
standstill.
NOTE
If the discharge line is equipped with a non-return or check valve, the shut-off element
may remain open as long as there is some back pressure.
For prolonged shutdown periods:
1. Close the shut-off element in the suction line.
Mechanical seal
6 Commissioning/Start-up/Shutdown
Vitastage
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