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How does a submersible well pump work?

Published in Well Pump Operation 2 mins read

A submersible well pump works by pushing water to the surface, offering high pressure and flow rate while being fully immersed in the water.

Here's a breakdown of how it works:

  • Immersion: The pump is designed to be submerged inside the well.
  • High Pressure & Flow Rate: It can deliver water at a high pressure and flow rate, even from significant depths (according to the [YouTube video reference][]).
  • Mechanism: Instead of sucking water, the submersible pump pushes the water to the surface. While the reference doesn't explicitly detail the internal mechanism, submersible pumps typically use a series of impellers and diffusers.
    • Impellers: Rotating blades that increase the water's velocity and kinetic energy.
    • Diffusers: Stationary components that convert the kinetic energy into pressure.
  • Multi-Stage Design: Many submersible well pumps use a multi-stage design, with multiple impeller/diffuser sets stacked on top of each other, further increasing pressure output.

Here's how the process typically unfolds:

  1. Water Enters: Water enters the pump through a screen, preventing large debris from entering and damaging the impellers.
  2. Impeller Rotation: The motor spins the impellers, accelerating the water outward.
  3. Pressure Increase: As the water passes through the diffusers, its velocity is reduced, and the pressure increases.
  4. Discharge: The pressurized water is then forced upwards through the drop pipe to the surface.

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