Speck pumpen Normblock Installation & Operating Manual page 90

Mechanical seal
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6 Commissioning/Start-up/Shutdown
6.1.3 Start-up
DANGER
Non-compliance with the permissible pressure and temperature limits if the pump is
operated with the suction and/or discharge line closed.
Explosion hazard!
Leakage of hot or toxic fluids!
▷ Never operate the pump with the shut-off elements in the suction line and/or
discharge line closed.
▷ Only start up the pump set with the discharge-side shut-off element slightly or
fully open.
DANGER
Excessive temperatures due to dry running or excessive gas content in the fluid
handled
Explosion hazard!
Damage to the pump set!
▷ Never operate the pump set without liquid fill.
▷ Prime the pump as per operating instructions.
▷ Always operate the pump within the permissible operating range.
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.
✓
The 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 full rotational speed, slowly open the
shut-off element in the discharge line and adjust it to comply with the duty
point.
6.1.4 Checking the shaft seal
The mechanical seal only leaks slightly or invisibly (as vapour) during operation.
Mechanical seals are maintenance-free.
Normblock