DANGER
Seal leakage at operating temperature
Hot or toxic fluid may escape!
▷
Once the operating temperature has been reached, re-tighten the hexagon nuts
at the casing/discharge cover.
▷
Check the coupling alignment. Re-align the coupling if required.
5. After the operating temperature has been reached and/or in the event of
leakage, switch off the pump set and retighten the bolts between lantern and
casing.
6. Check the coupling alignment. Re-align the coupling if required.
6.1.6 Checking the shaft seal
The mechanical seal only leaks slightly or invisibly (as vapour) during operation.
Mechanical seals are maintenance-free.
The packed gland must leak slightly during operation.
If a pure graphite packing ring is used, there must always be leakage.
Table 9: Leakage rate of the pure graphite packing ring
Quantity
Values
Minimum
10 cm
³
/min
Maximum
20 cm
³
/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.
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 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 at minimum fluid pressure.
6.1.7 Shutdown
CAUTION
Heat build-up inside the pump
Damage to the shaft seal!
▷
Depending on the type of installation, the pump set requires sufficient after-run
time – with the heat source switched off – until the fluid handled has cooled
down.
✓
The shut-off element in the suction line is and remains open.
1. Close the shut-off element in the discharge line.
Mechanical seal
Gland packing
Pure graphite packing ring
Prior to commissioning
After five minutes of
operation
6 Commissioning/Start-up/Shutdown
Etanorm
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