6 Commissioning/Start-up/Shutdown
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HPK
1121.8/06-EN
Not enough leakage:
Slightly loosen the nuts at the gland follower.
No leakage:
Immediately switch off pump set!
Loosen the gland follower and repeat commissioning.
Checking the leakage
After the leakage has been adjusted, monitor the leakage for about two hours at
maximum fluid temperature.
Check that enough leakage occurs at the gland packing at minimum fluid pressure.
6.1.13 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.
NOTE
If the discharge line is equipped with a non-return or check valve, the shut-off
element may remain open provided that the system conditions and system
regulations are considered and observed.
NOTE
If shut-off is not possible, the pump will run in reverse direction.
The reverse runaway speed must be lower than the rated speed.
For prolonged shutdown periods:
1. Close the shut-off element in the suction line.
2. Close the auxiliary connections.
If the fluid to be handled is fed in under vacuum, also supply the shaft seal with
barrier fluid during standstill.
Only turn off the cooling liquid supply after the pump has cooled down.
CAUTION
Risk of freezing during prolonged pump shutdown periods
Damage to the pump!
▷ Drain the pump and the cooling/heating chambers (if any) or otherwise protect
them against freezing.
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