Displacement Pumps

The decision to select a positive displacement pumps in GA over a centrifugal pump is not always a clear one. Both types each possess very different behaviors and if you are not familiar with them, it may be difficult to understand how a positive displacement pump could fit into your process.

Positive displacement pumps are a more effective choice than centrifugal pumps in some circumstances. If any of the conditions or applications listed below are in your practice, a positive displacement pump should probably be used.

Higher Viscosity: Centrifugal pumps experiences issues pumping thick liquids, making them very inefficient at even fairly small levels. Positive displacement pumps, on the other hand, have no difficulty moving viscous liquids.

Low Flow: A centrifugal pump is often run off its (best efficiency point) BEP when a lesser flow is desired, much to the pump’s disadvantage. Running a centrifugal off its BEP can cause extreme energy consumption, harm to the pump, and overall poor performance.

A positive displacement pump, however, is well-suited for these conditions, providing constant flow of fluid at a given pump speed. If you’re attempting to get the pressure or flow you need by operating a centrifugal pump off its best efficiency point (BEP), a positive displacement pumps in GA may be a smarter choice.

Metering: A positive displacement pumps is a great choice for metering applications. They provide constant flow, allowing them to easily meet process requirements. Some common types of positive displacement pumps that are used for metering include:
• Peristaltic
• Gear
• Diaphragm
• Plunger
• Piston

High-Pressure Needs: Positive displacement pumps in GA are an excellent choice for processes that require high pressure, with some models producing over 1,000 psi (2,300 ft). But because of the positive displacement pump’s design, if kept in operation against a closed discharge valve, it will continue to build pressure until the line bursts, the pump is broken, or both.

Shear Sensitive Liquids: Centrifugal pumps generally operate at higher speeds when compared to positive displacement pumps in GA. the higher speeds can shear liquids, making centrifugal pumps a poor choice for liquids such as tomato paste and latex paint. Positive displacement pumps that operate at lower speeds can be milder on products and are usually preferred in these types of processes.

Centrifugal pumps and positive displacement pumps in GA behave very differently. Understanding their behaviors can help you be sure to choose the right one for your application. Don’t leave it to chance! Call our office today to speak with one of our experts so you can make the best choice for your application.