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.
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.
6.1.11 Checking the shaft seal
The mechanical seal only leaks slightly or invisibly (as vapour) during operation.
Mechanical seals are maintenance-free.
The gland packing must drip slightly during operation.
DANGER
Impermissibly high temperatures at gland packings
Explosion hazard!
▷ Always use suitable temperature monitoring for gland packings.
▷ Gland packing must be tightened correctly.
If a pure graphite packing is used, there must always be some leakage.
Table 13: Leakage rate of the pure graphite packing
Quantity Values
Minimum 10 cm³/min
Maximum 20 cm³/min
Adjusting the leakage
1. Only lightly tighten the nuts of the gland follower by hand.
2. Use a feeler gauge to verify that the gland follower is mounted centred and at
a right angle to the shaft.
⇨ The gland must leak after the pump has been primed.
WARNING
Unprotected rotating parts
Risk of personal injury!
▷ Do not touch rotating parts.
▷ When the pump is running, perform any work with utmost caution.
The leakage can be reduced.
1. Tighten the nuts on the gland follower by 1/6 turn.
2. Monitor the leakage for another five minutes.
Excessive leakage:
Repeat steps 1 and 2 until the minimum value has been reached.
Not enough leakage:
Slightly loosen the nuts at the gland follower.
Mechanical seal
Gland packing
Pure graphite packing
Prior to commissioning
After five minutes of
operation
6 Commissioning/Start-up/Shutdown
38 of 74
MegaCPK
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