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What is a submersible pump?

The main thing that differentiates a submersible pump from another kind is the hermetically-sealed motor which is close-coupled to its body.

Submerged in water as the name suggests, these pumps push all liquids to the surface rather than pulling them in, making them more effective than many types of jet pump, especially in terms of preventing pump cavitation.

Karcher Submersible Pump

Karcher Submersible Pump

How does it work?

A series of impellers are stacked on top of one another, lifting the water. Once the motor is started, these propel the water to move in a different direction. Multiple submersible pumps can be used in conjunction with one another in order to improve the lift even more.

By pulling the water into the pump – first through the intake as a result of the impeller, and second towards the surface – they are able to convert rotary energy into kinetic energy and, finally, into pressure energy.

General advantages of submersible pumps

One major advantage to this kind of pump is that you never have to prime it because it’s already been submerged. This submersion also means that it’s generally quiet when running.

On top of this, submersible pumps don’t need to use lots of electrical energy to bring the water inside of the pump themselves, as being submerged the water pressure does a lot of this work for them. As a result they are able to run very efficiently, they also tend to deal well with solid objects that get caught up in the stream.

How can they be used?

Submersible pumps cover a wide range of applications, including general industrial pumping and sewage pumping, and uses in water wells, drilling rigs, irrigation systems and firefighting. Here we’re going to focus on why they’re a good choice for two particular types of application:

• Waste water – submersible pumps that are manufactured from high-quality stainless steel are able to cope with highly corrosive and acidic environments. They can deal with temperatures up to 200 degrees Fahrenheit; can pass solids without stopping a high volume of water; and are particularly wear-resistant.

• Flood water – given that they are designed to work underwater, submersible pumps are particularly well-sealed to prevent water damage. They can easily redirect flood water towards a drain before it fills an area, structure or room. Alongside this, they are effective at preventing damp conditions, controlling humidity levels and generally stopping mildew and mould from building up, all of which can create worse conditions in the event of flooding.

Find out more

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