A submersible pump and a centrifugal pump both rely upon the centrifugal force to pump out the water. However, they are installed at different locations due to being built in different ways. A submersible pump is installed underwater whereas a centrifugal pump is installed on the ground. Therefore, submersible pumps are used for groundwater extraction through deep wells and centrifugal pumps are ideal for water supply and drainage applications in urban areas or for industrial purposes.
Submersible Pump
Design
Submersible pumps are designed to stay submerged inside a pond, tank, or other storage locations. The motor of submersible pumps remains sealed inside the cavities filled with oil. These cavities stay sealed from exposure to transfer media. It is possible to modify the structure of a standard pump (bladder/dewatering/fountain pump) and let it work as a submersible pump.
Installation
Submersible pumps are installed in bore wells or boreholes and remain submerged in water.
Working Principles
- The claw couplings or single-key barrel couplings keep the motor connected to the pumps.
- The pumps are fitted with three-core cables of varying parameters.
- The starting equipment is an air-switch of different capacity levels.
- The pump has an auto-decompression pneumatic device and a water pipe.
- It is fitted with steel pipes of different diameters that remain connected with the help of flanges.
- A ‘gate valve’ controls the high-lift electric pump.
Use
This pumping device can lift water from deep wells. The entire unit of a submersible pump remains submerged. The pump changes the rotary energy into kinetic energy which transforms into pressure energy in order to drive the groundwater to the surface.
Application
A submersible pump can be used to:
- Pump out the larger solids or to grind the larger solids into smaller particles
- Move wastewater at higher pressure and larger flow rates.
- Pump water from the bottom of the pond. The process of pumping water depends upon a pump’s design.
This type of pump is used in mining, Navy, rescue missions, wastewater services, or fire services. They are used for pumping sewage, management of saltwater, drainage, dirt-treatment, extraction of groundwater, irrigation of artificial lifts, dewatering of mines, firefighting, agricultural applications, etc.
Structure
Submersible Pumps is Made up of:-
- Delivery Casing
- Diffuser
- Impeller
- Bearing
- Neck Ring
- Pump Shaft
- Strainer
- Coupling
- Suction InterConnector
Centrifugal Pumps
Design
The design of centrifugal pumps prevents them from being submerged. Hence, they are kept outside the water-body. This type of pump can be easily accessed and centrifugal pumps offer a higher level of pressure in comparison to a submersible pump. They are available in different sizes and voltages. The stationary parts of a centrifugal pump are nozzles, casing, and bearing housing. The impeller and shaft are the rotating parts.
Installation
It is installed on the ground near the source of water.
Working Principles
A centrifugal pump transforms the centrifugal force into kinetic energy in order to drive the water out. At first, the water is driven into the pump and the droplets start rotating when the impeller rotates at high speed. The energy generated through the rotation of the impeller drives the water out with the help of a diffuser. In centrifugal pumps, the motor shaft and water-pump shaft are the same.
Use
This type of pump is used to transport liquid (oil, chemicals, water, etc.) based upon the principle of centrifugal force.
Application
Centrifugal pumps can be used to convey different types of liquid substances, such as water, liquid organic substances, solvents, acid, oil, etc., for industrial, domestic, or agricultural applications.
Structure
Centrifugal pumps are made of:
- Pump body
- Impeller
- Pump shaft
- water retaining ring
- Pump cover
- Sealing ring
- Bearing
- Axial force balance device
- Stuffing box etc.
Final Words
A centrifugal pump and a submersible pump are used in the extraction of water or liquid substances. Both of these pumps work on the principle of centrifugal force. However, they have different applications since they are installed at different locations due to the variation in their structure. Find more information on Submersible pumps by visiting us at Unnati Pumps. For inquiry contact us by clicking here.