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13. MOUNTING POSITION
PEARL submersible motors are designed primarily for operation in the vertical, shaft-up position.
During acceleration, the pump thrust increases as its output head increases. In cases where the pump head stays
below its normal operating range during startup and full speed condition, the pump may create upward thrust. This
creates upward thrust on the motor upthrust bearing. This is an acceptable operation for short periods at each start,
but running continuously with upthrust may cause excessive wear on the upthrust bearing
With certain restrictions, motors are also suitable for operations in positions from shaft-up to shaft-horizontal. As
the mounting position becomes further from vertical and closer to horizontal, the probability of shortened thrust
bearing life increases. For normal thrust bearing life expectancy with motor positions other than shaft-up, follow
these recommendations:
1.
All the motors in the range can be installed horizontally as long as the axial thrust of the
pump never falls below 100 N while it is working.
2.
Do not use in systems which can run even for short periods at full speed without thrust
toward the motor
3.
Minimize the frequency of starts, Six inch motors should have a minimum of 20 minutes
between starts or starting attempts
4MWP
4" Submersible Motors
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