CAUTION
Abnormal noises, vibrations, temperatures or leakage
Damage to the pump!
▷ Switch off the pump (set) immediately.
▷ Eliminate the causes before returning the pump set to service.
✓ The system piping has been cleaned.
✓ Pump, suction line and inlet tank, if any, have been vented and primed with the
fluid to be pumped.
✓ 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.
Start up the motor.
4. Immediately after the pump has reached rated speed, slowly open the shut-off
element in the discharge line and adjust it to comply with the duty point.
CAUTION
Misalignment of pump and coupling
Damage to pump, motor and coupling!
▷ When the operating temperature has been reached, switch off the pump set
and check the coupling alignment.
5. Check the coupling alignment and re-align the coupling, if required.
6.1.12 Checking the shaft seal
The mechanical seal only leaks slightly or invisibly (as vapour) during operation.
Mechanical seals are maintenance-free.
6.1.13 Shutdown
✓ The shut-off element in the suction line is and remains open.
✓ On pump sets with double mechanical seal, apply the required pressure specified
in the general arrangement drawing to the mechanical seal chamber also during
standstill.
✓ Also ensure quench liquid supply is ON during pump standstill.
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 in the discharge line may remain open, provided the site's requirements
and regulations are taken into account and observed.
Mechanical seal
6 Commissioning/Start-up/Shutdown
RPH
35 of 76
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