What is a Submersible Pump?

If you have a sump pump in your basement, you are probably very familiar with submersible pumps. Submersible pumps are operated by hermetically sealed motors and are, as their name suggests, used to pump liquid that they are fully submerged in.  The pump operates by pushing the liquid it is submerged in up to the surface.

Like in a centrifugal pump, the pump consists primarily of a casing and impeller.  The sealed motor drives the impeller to draw water up into the pump, where the force of the spinning impeller against the casing sends the water around and out of the pump and up a pipe or hose to the surface.

Submersible pumps help avoid issues with pump cavitation, where the pump begins to form bubbles of vapor and inhibit correct pump function.  Being completely submerged helps prevent this issue from occurring and enables better continued use without interruption.

A sump pump in a basement is not the only place submersible pumps are used.  They have many applications, and it is important to understand what your pump needs to be able to handle before purchasing and installing.  Among other uses, they are commonly found in water treatment and petroleum applications and are widely used on construction sites and other applications. 

One important consideration is the level of solids and the kind of material being pumped.  In the future we will discuss how to select a pump for higher levels of solids and heavier liquids. 

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