Submersible Pumps - An Overview

Submersible pumps, as the name suggests are pumps which can be immersed in the water.  They are useful in situations where the water is from a deep source.  The submersible pump is a compact and hermetically sealed assembly containing the motor and the impeller in a single body.  The motor and the impeller are placed in a  single vertical shaft.  A centrifugal impeller is used.  The water enters the pump from an opening in the bottom.  It is pressurized and is conducted through the casing of the pump upwards to the surface.

The submersible pump should always be below the water level as the water is used to cool the pump.  The pump can get overheated if the water level falls or if the pump is operated out of the water.

Submersible pumps should never be used in water where people may swim.  There is a risk of electricity leaking and people may get electrocuted.

Advantages of submersible pumps over jet pumps.

Submersible pumps are more efficient.
They do not require priming
They are quieter.
They do not require any extra space.

Disadvantages of submersible pumps

High initial cost
Risk of current leakage in water