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submersible pumps

Date post: 15-Apr-2017
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Submersible pump
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Submersible pump

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Produced and Executed by –Roll no. Name

99. Abhishek Shanbag.

100. Dakshant Sharma.

101. Parikshit Sharma.

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Introduction:- 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 pump and the fluid surface. Submersible pumps push fluid to the surface as opposed to jet pumps having to pull fluids. Submersibles are more efficient than jet pumps.

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Principle :- The submersible pumps used in ESP installations are multistage centrifugal pumps operating in a vertical position. Although their constructional and operational features underwent a continuous evolution over the years, their basic operational principle remained the same. Produced liquids, after being subjected to great centrifugal forces caused by the high rotational speed of 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.

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Working :- The pump shaft is connected tothe gas separator or the protector by a mechanical coupling at thebottom of the pump. Well fluids enter the pump through an intakescreen and are lifted by the pump stages. Other parts include the radial bearings (bushings) distributed alongthe length of the shaft providing radial support to the pump shaft turningat high rotational speeds. An optional thrust bearing takes up part of the axial forces arising in the pump but most of thoseforces are absorbed by the protector’s thrust bearing.

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Advantages :-The major advantage

to a submersible pump is that it never has to be primed, because it is already submerged in the fluid.

They are also very efficient because they don’t really have to spend a lot of energy moving water into the pump. Water pressure pushes the water into a submersible pump, thus “saving” a lot of the pump’s energy.

Submersible pumpsare quiet, because they are under water, and cavitation is never an issue, because there is no “spike” in pressure as the water flows through the pump.

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Single stage pumps are used for drainage,sewage pumping, general industrial pumping and slurry pumping.

They are also popular with pond filters. Multiple stage submersible pumps are

typically lowered down a borehole and used for water abstraction, water wells and in oil wells.

They are used in applicationsincluding sewage treatment plants, fire fighting, mine dewatering, irrigation systems and water supply systems.

Applications :-

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