Flowserve N-Series Worthington - Manual (Page 8)

N-SERIES OF THRUST POT USER INSTRUCTIONS ENGLISH 07/14
Page 8 of 20
3.0 COMMISSIONING START-UP,
OPERATION AND SHUTDOWN
These operations must be
carried out by fully qualified personnel.
3.1 Pump Lubricants
3.1.1 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.
As option a ¼” NPT connection for a purge oil mist
lubrication is provided (refer to General Arrangement
Drawing).
For recommended lubricating oils refer to the
lubrication table.
3.1.2 Purge oil mist lubrication
For preventing, that dirt or humidity get into the bearing
housing, this pump is equipped with a ¼“ NPT
connection for air or nitrogen supply.
Also at standstill the air or nitrogen supply shall be
maintained.
The pressure shall be between
0.01 bar (0.14 psi) and 0.02 bar (0.29 psi), otherwise
you have to consider an oil leakage and as a result a
bearing damage .
The provided flow rate shall be 0,1 SCFM.
The supplied air or nitrogen shall be clean and dry.
3.1.3 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.
3.1.4 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.
3.1.5 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 o ne
must 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) afte r
this running-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 mixing the lubricating oil
with a corrosion inhibitor contact your lubrication oil
supplier for proper additives inhibitors.
3.1.6 Oil quantity
Bearing size is shown on the name plate of the
pump, and with this the correct thrust bearing frame
can be selected according to the following table.
Thrust bearing No. Oil quantity l (Fl.oz.) Bearing size
0 N 0.5 (16.9) 7210 BECBJ
1 N 1.5 (50.7) 7313 BECBJ
3 N 2 (67.6) 7315 BECBJ
4 N 2.5 (84.5) 7317 BECBJ
5 N 3 (101.4) 7318 BECBJ
6 N 5 (169) 7322 BECBM
7 N 6.5 (219.8) 7326 BCBM
8 N 6.5 (219.8)
7232 BCBM
7330 BCBM