Flowserve WUC Worthington - Manual (Page 24)

WUC USER INSTRUCTIONS ENGLISH - 07/14
Page 24 of 52
c) During filling the pump shall reach the specified
temperature, so pumps for hot liquids (T > 100 °C
(212 °F)) shall be warmed up by preflushing with a
rate of 50 °C (78 °F) per hour. Unless otherwise
specified the external temperature of the pump
must be within 30 °C (54 °F) of the temperature
of the liquid to be pumped at that time.Cryogenic
pumps must be cooled down. The lower part of the
seal gland, the gascofferdam and the headstock
must be completely coated with ice. The ice has
good isolating properties and limits the heat input
from the ambient.
d) Check the sense of rotation of the pump (Coupling
spacer dismantled).
Sense of rotation is counter clockwise viewed to
the drive end of the pump.
e) The pump rotor and the shaft seal must be in
correct axial position. Mounting plates of
mechanical seal must be locked at the seal gland
in open position. Drive-collar of the mechanical
seal sleeve must be tightened.
f) Check the readiness of all auxiliary systems (seal
sys., lubrication sys.,...) for start up.
g) All pipe work, including the internal and the
auxiliary pipe work, must be connected correctly
and must be absolutely tight. Check the tightness
of all connections of the auxiliary pipe work. The
suction valve must be open, the discharge valve
shall be closed.
h) Turn the pump by hand, if required with the help of
a lever, to check the free rotation of the rotor. The
rotor must turn uniformly and noiselessly. Some
resistance may be felt due to friction in bearings
and seals.
i) Check the readiness of the driver for start up. Refer
to the manual of the driver (preheating for
explosion proof E-motor).
5.2 Pump Lubricants
5.2.1 Lubrication
The bearing housing shall be filled with proper
lubricating oil prior to start up. If the pump will be
started after a longer storage period, the bearing
housing should be first flushed and cleaned with
gasoline. It is not necessary to remove the
preservation oil as this will mix up thoroughly with the
lubrication oil.
Lubrication is provided by the pumping effect of the
rotating ball bearings. Maintaining the correct oil level
(middle of the oil sight glass) ensures that the lower
ball bearing is covered with oil.
For recommended lubricating oils refer to the
lubrication table 5.2.6
5.2.2 Oil change
After first start up, the oil shall be changed after 200
service hours.
Every further oil change shall take place after about
2000 service hours or at least every 6 month.
5.2.3 Oil level
The correct oil level is in the middle of the oil sight glass
and shall be checked when pump is not in operation.
Periodically check if the lubricating oil is mixed with any
condensed water. Careful opening of the oil drain
during a stop of the pump will show any water.
During operation the level will decrease
due to circulation of the oil through the bearings.
A too high oil level will result in higher bearing
temperatures and therefore poorer lubrication.
5.2.4 Oil quality
Oil used for lubrication should only be of high quality.
The viscosity of the oil at working temperature must
be at least 10 cSt. The pouring point of the oil must
be in accordance with the lowest expected
temperature of the bearing housing during a stop of
the pump. For recommended lubricating oils refer to
the lubrication table.
Having selected the corresponding oil quality the
actual oil temperature at the bearing housing must be
checked after two service hours of the pump.
Considering this measured oil temperature the actual
viscosity must be determined by using the data sheet
of the oil, to verify the minimum required viscosity of
10 cSt. Do not forget, the oil temperature in the
bearing itself is about 10 °C (
∆ 18 °F) higher than the
oil temperature at the bearing housing. On the
following table the oil viscosity is given at 40 °C (104
°F). Determining the correct lubricating oil one mu st
take into consideration that all bearings will have
higher temperatures during the first 20 service hours.
In constant operation the bearing temperature will
decrease about 10 °C (50 °F). The oil temperature
shall be lower than 85 °C (185 °F) after this runni ng-
in time. The bearing outer race temperature should
not exceed 95°C (203°F). If the temperature is
higher, the reason may be a wrong oil quality, wrong
oil level or overload of the pump because of
excessive wear.
If the humidity at the site is high, the roller bearings
become easily rusty during stand still periods. To
avoid that, we recommend to mix the lubricating oil
with a corrosion inhibitor contact your lubrication oil
supplier for proper additives inhibitors.
5.2.5 Oil quantity