Commissioning, Startup, Operation, and Shutdown
Model API 3171 Installation, Operation, and Maintenance Manual
31
recommended oil for the oil mist is an ISO VG 100. See the table for recommended oil mist
airflows. Follow the instructions from the oil mist system supplier. The oil mist system must be
interconnected with the pump so that the pump will shut down if the mist system fails.
Table 3: Recommended oil mist airflows
This data is based on an oil/air ratio of 0.4 cubic inch (0.22 ounce) per hour per cfm.
Frame size
Airflow in cfm (l/m)
S/ST
0.10 (2.83)
M/MT
0.16 (4.53)
L
0.22 (6.23)
Flush the steady bearings
There are five 1/4-in. NPT pipe plugs on the standard support plate that you use to connect the
flush lines. Each plug connects with each of the five bearings. Pumps with less than five
bearings still have five plugs, but only the required number are connected to bearings.
1. Remove the plugs from the holes that are connected to flush lines.
2. Connect an external source of clean water to the taps.
The water source must be able to deliver 1 to 2 GPM to each bearing.
3. Turn on the water in order to begin the flush.
Sealed bearings
Sealed bearings have a lip seal above and below the bearing in order to keep grit out of the
bearing. Sealed bearings use a spring-loaded grease cup for lubrication. The bearings are pre-
lubricated at the factory, but the grease cups ship in a separate box in order to prevent shipping
damage. Fill the grease cups with grease and screw the cups into the taps that are connected
to the bearings. Refill the cups with fresh grease as needed. Frequently inspect the grease
cups after startup in order to check usage and establish the best relubrication interval.
123
Deflector
197
Steady bearings
213
Housing, steady bearings
333H
Lip seal
369
Retaining ring, steady bearing
Figure 14: Sealed bearings
Lubricate the sealed bearings with grease cups
For models with grease-lubricated bearings, the spring-operated automatic grease cups are
designed to maintain constant lubrication of the intermediate pump bearings that are fixed to
the vertical pump housing. The center stem protrudes out of the housing when the cup is full
and gradually moves down into the housing as the grease is used. After the wing nut is
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