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5.2.2 Grease
5.2.2.1 Regreasable
Single shielded regreasable bearings. When the
grease lubrication option is specified, single shielded
bearings, grease fittings and vent pipe plugs are
installed inboard and outboard.
Figure 5-8: Horizontal pump shield orientation
Horizontal pump bearings are packed with Exxon
POLYREX EM grease prior to assembly. For
relubrication, a grease with the same type base
(polyurea) and oil (mineral) should be used. To
regrease, remove the pipe plug from both the inboard
and outboard bearing location. (See figure 5-9.)
After relubricating the bearings three times, it is
typically recommended that the old grease be
cleaned out of the bearing housing.
Make sure to be electrically grounded
prior to regreasing in an explosive atmosphere. To
regrease bearings under coupling guard, stop pump,
lock the motor, remove coupling guard, and then
regrease the bearings.
Figure 5-9: Regreasable configuration
The amount of grease required for horizontal pumps
is shown in figure 5-10.
Page 26 of 52
USER INSTRUCTIONS POLYCHEM GRP ENGLISH 71569132 12-04A
Figure 5-10: Horizontal lubrication amounts
Housing
Group 1 Inboard
Group 1 Outboard
Group 1 Duplex
Group 2 Inboard
Group 2 Outboard
Group 2 Duplex
Group 3 and 4
Inboard
Group 3 and 4
Outboard
Group 3 and 4
Duplex
greased bearings are used. The oil will leach the
grease out of the bearings and the life of the bearings
may be drastically reduced.
5.2.2.2 Grease for life
Double shielded or double sealed bearings
These bearings are packed with grease by the
bearing manufacturer and should not be relubricated.
The replacement interval for these bearings is greatly
affected by their operating temperature and speed.
Shielded bearings typically operate cooler.
5.2.3 Oil mist
The inlet port for all horizontal pumps is the plugged
½ in. NPT located at the top of the bearing housing.
A vent fitting has been supplied on the bearing
carrier, as well as a plugged ¼ in. NPT bottom drain
on the bearing housing. (See section 4.6.6.4, Oil mist
lubrication system.) Do not allow oil level to remain
above the center of the bearing housing sight glass
window with purge mist (wet sump) systems.
The optional oil slinger must not be used with an oil
mist system.
5.3 Impeller clearance
Before carrying out this procedure ensure that the
mechanical seal(s) fitted can tolerate a change in
their axial setting, otherwise it will be necessary to
dismantle the unit and reset the seal axial position
after adjusting the impeller clearance.
5.3.1 Final impeller clearance
The open impeller design used by the PolyChem
GRP is set off the casing to achieve the final
operational gap. The impeller clearance was set at
the factory. (See figure 5-11.)
Initial lube
Until grease comes out
of plug
Until grease comes out
of plug
3
3
34 cm
(2.1 in
)
Until grease comes out
of plug
Until grease comes out
of plug
3
3
68 cm
(4.1 in
)
Until grease comes out
of plug
Until grease comes out
of plug
3
3
115 cm
(7.0 in.
)
Do not fill the housing with oil when
Relubrication
3
7.5 cm
3
(0.46 in.
)
3
14 cm
3
(0.85 in.
)
3
17 cm
3
(1.0 in.
)
3
17 cm
3
(1.0 in.
)
3
28 cm
3
(1.7 in.
)
3
34 cm
3
(2.1 in.
)
3
30 cm
3
(1.8 in.
)
3
54 cm
3
(3.3 in.
)
3
60 cm
3
(3.7 in.
)
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