The progressing cavity pump is a positive displacement pump that uses a helix-shaped rotor to pull fluids of varying viscosities into isolated cavities and discharge them. It is useful for wastewater management and other environments with suspended sediment. Flow rate is adjustable, and maintenance is required. Manufacturers offer a range of sizes and speeds, and rental and leasing options are available. It is important to select a pump that can handle current and future needs.
A progressing cavity pump is a type of pump useful for liquids and slurries with a range of viscosities. This design features a helix-shaped rotor mounted inside a sealed container. As the rotor spins, it pulls the fluid in the container into a series of isolated cavities, discharging it out the other end. The design is also known as an eccentric screw pump, as it looks similar to a corkscrew inside the container, or as a Moineau pump, after the French inventor who first developed it.
The progressing cavity pump is an example of a positive displacement pump, functioning to move a fluid from one location to another by trapping it. This pump does not require priming, as it does not rely on holding pressure to operate, and can handle very low flows and very thick materials, as the rotor acts mechanically to pull the fluid until it reaches the discharge tube.
This pump design can be useful for wastewater management facilities and a variety of other environments where fluids may have suspended sediment. Flow rate is adjustable by changing the rotational speed of the rotor, allowing the operator to decide how much fluid to move in a given amount of time with a progressing cavity pump. Maintenance requirements include lubricating the rotor shaft, periodically cleaning the intake and exhaust pipes to remove blockages, and confirming that the seal is still tight.
Manufacturers with lines of progressing cavity pumps usually feature a range of sizes and speeds for different applications. For customers who are unsure of which model is best for their purposes, it may be helpful to seek advice and assistance from a company representative. It is important to select a pump that can handle a given flow rate and consider future pumping needs; if volumes are likely to increase, for example, purchasing a pump rated for the current application will not be sufficient, as it will start to overload as volume increases.
Sometimes you can rent a progressing cavity pump for a specific application or use it in a trial run to see if it meets your needs. Companies may also offer leases and sales of used pumps to provide consumers with more options. For companies looking to buy a new unit, the manufacturer can offer periodic offers for new customers that can lower the price and make the progressing cavity pump more affordable.
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