Omega
16
8 Special Instructions for
Subassemblies (Shaft Seal Variants)
The shaft seal variant supplied is shown in the purchase order
and order--processing documents.
8.1 Gland packing
The gland packings used by KSB are asbestos--free and suita-
ble for drinking water applications.
Installation and commissioning
Before installation, ensure that the gland space is clean (no
packing remnants or corrosion). The shaft protecting sleeve
must be bright and have no scoring. Otherwise a new shaft pro-
tecting sleeve must be used.
Cutting the packing rings to size
If moulded packing rings are not available, the rings can best
be cut to size using a special cutting gauge. If no cutting gauge
is available, take a tube with the same diameter as the shaft,
wind the packing around the tube in a spiral and cut the rings
from the spiral. We recommend a straight cut.
Installing the packing rings
Push the packing rings with the stuffing box insert into the gland
space one by one. The joints of the packing rings must be offset
by 90_ . The number of rings and the arrangement of the lantern
ring are shown in the general drawing (see appendix). After fit-
ting all the packing rings, put on the stuffing box insert and gland
cover and tighten them so that the packing rings adapt to the
gland space. Then loosen the gland cover again to relieve the
load on the packing. This procedure is not necessary if moulded
packing rings are used.
Commissioning
When the pump is started up, the gland must only be gently tigh-
tened (by hand). A high leakage rate (approx. 50 to 200 drops
per minute), depending on the liquid being pumped, must be ac-
cepted until the packing material has settled and has adapted
to the temperature conditions (approx. 10 to 15 minutes).
Then the gland cover must be c arefully and evenly tightened to
reduce the leakage to a minimum. If there is no leakage, there
is a risk that the packing will run hot.
Also note the following:
Leakage and temperature rise: If necessary, shut down the
pump. After a short cooling period (approx. 10 to 15 minutes)
the pump can be restarted. The necessary minimum leakage
depends on the liquid being pumped, the pressure, sliding velo-
city and temperature. It is approx. 10 to 120 drops per minute
(20 drops of water correspond to approx. 1 ml).
Disassembly
A packing puller must be used for pulling out the packing rings.
Maintenance
Gland packings must be repacked in accordance with the sec-
tion ”Installation and commissioning” after prolonged stand-
still, repair work or heavy leakage. Therefore, the leakage rate
must be observed during operation, also to avoid possible over-
heating.
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