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Submersible Pumps

A submersible pump (or sub pump, electric submersible pump (ESP)) is a device which has a hermetically sealed motor close-coupled to the pump body. The whole assembly is submerged in the fluid to be pumped. The main advantage of this type of pump is that it prevents pump cavitation, a problem associated with a high elevation difference between the pump and the fluid surface. Submersible pumps push fluid to the surface as opposed to jet pumps having to pull fluids. Submersible pumps are more efficient than jet pumps.

Electric submersible pumps are multistage centrifugal pumps operating in a vertical position. Liquids, accelerated by the impeller, lose their kinetic energy in the diffuser where a conversion of kinetic to pressure energy takes place. This is the main operational mechanism of radial and mixed flow pumps.

The pump shaft is connected to the gas separator or the protector by a mechanical coupling at the bottom of the pump. Fluids enters the pump through an intake screen and is lifted by the pump stages. Other parts include the radial bearings (bushings) that are distributed along the length of the shaft providing radial support to the pump shaft. An optional thrust bearing takes up part of the axial forces arising in the pump, however most of those forces are absorbed by the protector’s thrust bearing.
 

What are the advantages of a submersible pump?


If you've recently been on the market searching for a new submersible pump or any other pump for your home or farm, you may be overwhelmed by the number of options available. From submersible pumps to centrifugal pumps, the choices seem endless. However, submersible pumps can have unique advantages over other variants and may be exactly what you are looking for.

Energy efficiency
Submersible pumps typically operate within a very narrow flow of range. In order to do justice to different drilling depths, these are always multi-stage pumps. The deeper the well (i.e., static height), the more stages (more pressure) are required. The ability to adjust the number of stages to a reasonably low flow range allows pump manufacturers to create highly efficient pump designs. The key to getting the most efficient pump for your application is to have the well capacity accurately measured by a competent driller and select the correct pump size for your application based on well documented information.

No priming required
Submersible pumps are also used in applications where it would be difficult to prime a standard longitudinal suction centrifugal pump. Due to the suction of the submersible pump being submerged, priming is not required. It is vital to note that if you are using a submersible well pump in any application other than a well (such as a motor), you should make use of a flow induction sleeve to prevent overheating.

Designed for solids handling
Most submersible drainage pumps are designed to pump both solids and liquids without seizing during operation. This can be ideal for pumping out a flooded basement or draining an old well. It would be wise to purchase a submersible pump that advertises itself as solids resistant.
 

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