Why You Should Almost Never Use Progressive Cavity Pumps

Progressive cavity (PC) pumps, while they possess unique capabilities for handling difficult media, are often not the universal solution they are made out to be. In many industrial applications, the use of PC pumps can introduce inefficiencies and unnecessary complexities. Understanding when not to use these pumps can save your operation time, money, and a lot of hassle. 

So, why might progressive cavity (PC) pumps not be the best choice for many scenarios?

Understanding the Limitations

Firstly, PC pumps are well recognized for their ability to handle both low and highly viscous materials, as well as solids like fruit and vegetables. They offer continuous, gentle, and low-pulsation flow, which is crucial for precise dosing and handling of abrasive and corrosive fluids. However, these benefits come with a set of limitations that restrict their use in broader applications.

The Problem with Specific Needs for Lubrication

One of the most significant drawbacks of progressive cavity pumps is their requirement for a fluid film to keep the sliding surfaces lubricated. This dependency means they fail when run dry. For many industrial processes, where dry running can occasionally occur due to variable process conditions or human error, this is a critical vulnerability. The cost of downtime and repair in such instances can be substantial, negating the benefits offered by these pumps.

Inefficiencies in Flow and Movement

Despite their capabilities, PC pumps are inherently slower moving and don’t produce large amounts of flow compared to other pump types. To address this, installations often require additional components such as variable frequency drives (VFDs) or gear reducers, which not only increase the complexity and initial costs but also the ongoing maintenance expenses. Further, the volumetric efficiency of these pumps can be compromised if the viscous fluid does not flow quickly enough into the pump, imposing strict speed limits and operational constraints.

Distance and Efficiency Concerns

Another point to consider is that PC pumps can only pump fluids a limited distance. This limitation is compounded by high slippage rates due to the rotor/stator fits, causing the pump to operate less efficiently over time. In applications requiring long-distance fluid transport or where efficiency is paramount, progressive cavity pumps may not be the optimal choice.

Application Specificity

While PC pumps are well-suited to certain applications like slurry and sludge transfer, or handling shear-sensitive materials such as fruits and vegetables, their specialization can also be a drawback. For general applications, where such precise handling of materials is not required, the cost-effectiveness and operational simplicity of other types of pumps often outweigh the specialized benefits offered by PC pumps.

Cost vs. Benefit

The decision to use a progressive cavity pump should not be taken by default. Given their specialized nature, PC pumps are often more expensive not only to purchase but also to maintain. Industries must evaluate whether the benefits derived from their use justify the higher total cost of ownership compared to other pumping solutions that might be more forgiving and versatile.

While progressive cavity (PC) pumps have their place in handling complex and challenging fluid media, their use should be carefully considered against the operational requirements and economic implications. (Also read: Pros and Cons of PC Pumps)

At Vissers Sales Corp, we believe in providing our clients with the most effective and efficient solutions tailored to their specific needs. If you are considering the type of pump to use for your operations, or if you have any questions about pump selection and maintenance, please reach out to our experts at 1-800-367-4180. We are here to ensure that you make the best decision for your unique operational requirements.