KSB Omega, Installation & Operating Manual

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6.1.4 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
The temperatures at the gland packing have risen above the permissible limits
Explosion hazard!
▷
Gland packings are not approved for use in potentially explosive atmospheres.
▷
Immediately switch off the pump set!
The minimum leakage required depends on the fluid handled, pressure, slip velocity
and temperature.
Table 12: Leakage rates at the gland packing
Limits Leakage
Minimum 10 drops/min. (approx. 0.5 ml)
Maximum 120 drops/min. (approx. 6 ml)
CAUTION
Excessive leakage or no leakage at the gland packing
Damage to the pump!
▷
Excessive leakage: Re-tighten the gland follower until the required leakage rate
is reached.
▷
No leakage: Switch off the pump set immediately.
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.
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.
Mechanical seal
Gland packing
Prior to commissioning
After five minutes of
operation
6 Commissioning/Start-up/Shutdown
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Omega / Omega V