Table 14: Leakage rate of pure graphite packing (rings)
Quantity Leakage rate
Minimum 10 cm³/min
Maximum 20 cm³/min
Adjusting t h e 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.
The leakage can be reduced.
1.
Tighten the nuts of 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.
No leakage:
Switch off the pump set immediately!
Loosen the gland follower and repeat start-up.
Checking t h e 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 at minimum fluid pressure.
6.1.9 Shutdown
✓ The shut-off element in the suction line is and remains open.
✓ On pump sets with double-acting mechanical seal, properly vent the mechanical
seal chamber and apply the required pressure specified in the general
arrangement drawing (also during standstill).
✓ Also ensure quench liquid supply 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 valve may
remain open.
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.
CAUTION
Danger of frost/freezing during standstill of the pump
Damage to the pump!
▷ Drain the pump and any cooling/heating chambers and protect them against
freezing.
For prolonged shutdown periods:
1.
Close the shut-off element in the suction line.
2. Close the auxiliary connections.
If the fluid to be pumped is fed in under vacuum, also supply the shaft seal with
Prior to commissioning
After five minutes of
operation
6 Commissioning/Start-up/Shutdown
42 of 78
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