In this article, we are going to focus on pump efficiency. By the end of this blog post, you will understand what pump efficiency is.
What is pump efficiency?
Pump efficiency is how well the pump turns incoming energy, such as the mechanical power from an electrical motor, into the energy required to move the fluid through the system. Understanding pump efficiency is crucial because it directly affects cost, reliability, and performance across your entire application.
An electric motor produces rotational energy, which must be transferred to the pump shaft. Typically, a coupling connects the motor to the pump so the motor’s rotation can drive the pump and move the fluid. There are other methods of connecting a motor to a pump as well. During this process, some energy is inevitably lost due to factors such as friction, heat, and mechanical inefficiencies.
The chart below shows the efficiency of an MS50 impeller. Efficiency increases with flow up to the best efficiency point; beyond that additional flow causes higher friction and losses, reducing efficiency.
Where do energy losses come from?
In centrifugal pumps, the largest contributors to energy loss are hydraulic losses. These include:
- Turbulence within the pump
- Flow separation along impeller vanes
- Internal recirculation
- Losses caused by impeller and casing design
How the Pump’s Design Affect Efficiency.
A well-designed pump produces lower hydraulic losses and therefore operates with higher efficiency. Multistage pumps (such as our MS Series) are generally more efficient in high pressure applications because their design uses multiple impellers to build pressure gradually. Each impeller works together, spreading the load across several stages, which benefits BEP. This results in lower energy loss per stage, reduces turbulence, more controlled flow, and ultimately higher overall efficiency.
Summary
Learning what pump efficiency is very important for ensuring that your application performs as expected. Almost every pump manufacturer provides a pump efficiency curve that shows how efficiently a pump operates at different flow rates and pressures. Understanding this curve helps users select the correct pump, reduce energy consumption, lower operating costs, and extend the lifespan of the equipment.
END
Thank you for taking the time to read this post. I hope it gives you a clearer understanding of why pump efficiency matters and how it impacts performance, reliability, and long‑term costs.
If you’d like to dive deeper into pump technology, maintenance tips, or industry insights, explore our full blog collection. We’re constantly adding practical, easy‑to‑use information to help you stay informed and ahead in the pump world.
Author: Jimmy Cross
