Water pumps serve a variety of purposes, from acting as a way to continuously supply water to commercial establishments to being part of a dewatering project, especially after large rain events. Although most useful for general tasks, there's no doubt that choosing the right pump is essential to helping reduce downtime and operational costs.
The two most common pumps are centrifugal and positive displacement pumps, both of which move water from one point to another. Which one best suits your project’s needs, though?
Centrifugal Water Pumps
Centrifugal pumps are powerful and versatile: with the help of their rotating impellers, they increase the pressure of the discharge flow of water. Through centrifugal force, they push the fluid away in a system of circular motion. Furthermore, although the hydraulic pump can handle any type of liquid, they work best on clear, fresh water with high flow rates.
Those handling the domestic water supply may opt for a centrifugal water pump due to their low maintenance costs and high operating efficiency. Additionally, it is useful for both domestic and industrial applications — from draining water tanks to functioning as a pressure source for fire protection systems. They may, however, be prone to corrosion due to liquid exposure and overheating after prolonged use.
Positive Displacement Pumps
Positive displacement pumps move fluids through mechanical contraction and expansion: the pump traps liquid in an enclosed cavity until there is enough pressure to move it out of the discharge system. In fact, due to their ability to create high pressure, they are an excellent choice for pumping high viscosity liquids from one point to another. Furthermore, they are ideal for moving liquids that contain suspended or fragile solids.
For optimum benefit, maintain a close clearance between the rotating pump and the outer edge. If the pump operates at higher speeds, it could cause the liquids to erode and, as a result, damage the pump.
Selecting the right pump means understanding the different purposes they serve. Being aware of your needs and the kinds of liquids you work with can make the process of choosing the right pump a lot easier.