Submersible Pump

Overview

A borehole submersible pump is installed at depth in a well and pushes water up to the surface, rather than drawing it up by suction from above. Both the motor and the pump run fully submerged: the water-filled motor sits at the bottom and a stacked multistage hydraulic end above it lifts the water through many small pumping stages in series. Because lift is generated by pressure from below, a submersible avoids the suction-lift limit that caps surface pumps, which is what makes deep wells practical.

How it works

Drive comes from the Submersible Motor, a water-filled induction motor whose deionized fill fluid cools and lubricates the bearings while an equalizing diaphragm balances internal pressure against the well. A tilting-pad thrust bearing carries the downthrust of the whole impeller stack. Power reaches it through the Submersible Cable, a flat submersible cable spliced to the potted motor leads, and torque passes to the pump through the splined Motor Coupling.

The Hydraulic End does the lifting. It is a stack of eight identical stages, each an impeller spinning inside a fixed diffuser that converts velocity into pressure and feeds the next stage, so head builds cumulatively up the stack. Water enters through an intake strainer at the suction interconnector and leaves through the discharge head, where an integral check valve prevents backflow and water hammer. A Flow Shroud sleeve forces well water past the motor for cooling. At the surface a Control Box provides motor starting, run capacitance and overload protection, while a Pressure Switch cycles the pump on well demand. Inter-section joints are sealed by an O-Ring Set.