Flowserve Worthington WXB - Manual (Page 18)

WXB USER INSTRUCTIONS ENGLISH - 07/14
Page 18 of 51
seal sleeve must be tightend.
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.
The balance line must be
opened prior to start up and locked open during
operation.
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.
To change the oil use the following procedure:
a) Remove the reservoir (for some type of oilers you
must loose a fixing screw or lock nut, refer to
section 5.2.3 Oil level).
b) Open the oil drain on the bearing housing to
remove the oil.
c) Close the oil drain and fill in Oil through the oiler
until the oil level reaches the bottom of the sight
glass.
d) Fill the reservoir and put it quickly to the body of the
oiler. Observe the level in the reservoir. It will
decrease until the required oil level is reached
(middle of the sight glass). Ensure that enough oil
remains in the reservoir.
e) If necessary, the oil level can be adjusted by
referring to section 5.2.3 Oil level.
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.
Use a spirit level to check the horizontal
alignment of the bearing housing.
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 (204°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
Bearing size is shown on the name plate of the pump,
and with this the correct thrust and line bearing frame
can be selected according to the following table.