Rely on a Liquid Ring Pump

Replace a defective ejector-based vacuum system with a liquid ring pump to improve evaporator performance and capacity.

Ejector-based vacuum systems utilize steam to create vacuum. These systems typically experience significant wear and under-perform. Poor vacuum then results in lost evaporator capacity and high temperature operation with all of the related side effects (on efficiency and product quality, for instance). These systems are best replaced with a modern liquid ring pump arrangement that uses electric power for vacuum generation.

BTW: There is no such thing as a small vacuum leak. As much as 90 percent of all evaporator performance problems are traceable back to vacuum leaks. Read more in this blog post on investigating vacuum leaks in your evaporator.

The vacuum pump is the heart of a vacuum evaporator system and 95% of all evaporators use them. You can find them in evaporation units used for heat-sensitive products such as food and dairy, but also in any type of multi-effect evaporator to maximize energy efficiency.

More on the Liquid Ring Pump

The Liquid Ring Vacuum Pump (LRVP) has been around for over 100 years and is the workhorse in nearly all vacuum evaporator applications. It is pulsation free, has no valves and only one moving part — the impeller. It is very reliable. Water is used as a seal and creates the effect of a plunger, compressing the gas from vacuum to atmospheric pressure.

Read more about liquid ring pumps in this blog post.

More on Vacuum Issues

Caloris has extensive material available on vacuum issues in evaporator systems. In addition to the links above, check out these additional resources:

Blog: Leaky Vacuum Vessels May Be Costing You Money
Blog: More on Vacuum and Venting in Your Evaporator
Webinar: Evaporator Troubleshooting (Vacuum & Venting)

Ready to Talk to an Engineer?

Call Caloris at 410-822-6900 or send email to, if you are interested in discussing the installation of a liquid ring pump or other evaporation issues.



About Caloris

Caloris transforms process systems design for the better with unexpected, future-focused solutions that solve real operational problems. We engineer efficient, dependable and productive solutions that also improve environmental sustainability where practical. Designed with the end user in mind to drive plant productivity. Caloris offers evaporation, membrane filtration and spray drying process systems for food and dairy industries, as well as for water reuse and wastewater treatment applications. Both Caloris’ custom and pre-engineered packaged systems are designed to meet our customers’ specific concentration/purification needs utilizing the most cost effective and energy efficient technologies available. Whether concentrating dairy, food or juice products at a high-volume production facility, or processing industrial wastewaters to reduce transportation and treatment costs and recover re-usable water, Caloris provides a range of options and technologies.