With Fleet Bioprocessing having several different types of water pumps, differentiating them can be somewhat confusing. Hopefully, this guide will help you figure out the differences and how each water pump works so that you make the right choice.
• Centrifugal Water Pumps
They are pumps that increase the liquid pressure or induce a flow that results in a pumping action. They are often referred to as hydraulic pumps and are the most preferred type for industrial and domestic applications. Centrifugal water pumps are relatively cheap to maintain and straightforward to operate, which is probably why they are the most common choice.
The centrifugal pump has a case holding an impeller consisting of a set of curved vanes. The vanes rotate when the device is submerged in water. The rotation causes a build-up of centrifugal force in the water particles that force the liquid out. A practical example of how this works is when water flicks off of a car tyre as it moves on a wet road. The vanes do not generate a scooping action but rather generate a centrifugal force.
For this kind of pumps to work, they should be submerged in water. They can also work with flooded suction lines. However, the primary drawback with the centrifugal water pumps is air. When the average centrifugal pump encounters the air, it does not pump water effectively because of what’s known as an air-bound. The pump starts pumping air instead of water because it lacks the force needed to push out the water.
If the centrifugal pump is working correctly, it will be full of water without any air. If air gets in, then it will bind the pump, causing it to get jammed. The only solution is thus getting rid of the air so that the pump can work properly again.
• Peripheral Water Pumps
A peripheral pump has a close resemblance to a peripheral centrifugal pump. However, the difference is internal; in which the former is set up in a way that causes it to generate high discharge heads at low water flow rates. The water is pumped into a peripheral channel that is often around the edge of the pump’s casing. The pumps are also called turbine or regenerative water pumps, and the curves remain constant even as the water flow decreases. In short, the flow takes place along the circumference of the inlet to the casing’s outlet with increasing pressure.
• Self-Priming Centrifugal Water Pumps
A self-priming centrifugal water pump is a smart version of the standard centrifugal pump, in that is designed to overcome the weakness associated with the latter. With this kind of water pump, you will not have to deal with air binding because it mixes it with the water creating a fluid similar to pure water that it can pump normally. Once this process is complete, the pump will extract the air and push the water like how the typical centrifugal pump works.
The pump has a priming cycle in which air enters and mixes with the water at the impeller. The mixture will then exit by the centrifugal force generated by the impeller into a water reservoir where the air will rise as the water sinks. Once it is free of air, the water becomes heavier and flows back into the impeller that is self-priming as more air enters the suction line. A vacuum will then be created in the suction line once all the air is gone, and the pressure pushes the water into the suction line and to the impeller so that the pumping can start.
The re-circulation of the water halts when the pumping starts, and it will self-prime the next time it is used. The pump will once again mix air and water to create a liquid that it can pump until it is ready to operate normally.