KSB CTN - Checking the Shaft Seal; Shutdown

6 Commissioning/Start-up/Shutdown
33 of 76
CTN / CTN-H
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. In a dry installation configuration, fully open the shut-off element in the inlet/
suction 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 the duty point.
DANGER
Seal leakages at operating temperature
Hot or toxic fluid could escape!
▷ For dry installation only: Once the operating temperature has been reached
and/or in the event of leakage, switch off the pump set and re-tighten the bolts
between pipe assembly/suction cover/volute casing.
▷ Check the coupling alignment. Re-align the coupling if required.
5. For dry installation only: Once the operating temperature has been reached
and/or in the event of leakage, switch off the pump set and re-tighten the bolts
between pipe assembly/suction cover/volute casing.
6. Check the coupling alignment. Re-align the coupling if required.
(ðSection5.3,Page20)
6.1.11 Checking the shaft seal
DANGER
Excessive temperatures caused by gland packings
Explosion hazard!
▷ Never use gland packings in potentially explosive atmospheres.
Mechanical seal The mechanical seal only leaks slightly or invisibly (as vapour) during operation.
Mechanical seals are maintenance-free.
Gland packing The gland packing must drip slightly (on models with barrier/flushing fluid supply).
(Approximately 20 drops per minute)
6.1.12 Shutdown
ü The shut-off element in the suction line is and remains open.
ü 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.
ü 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.