Before the holidays we talked about how vacuum-pump oil becomes contaminated. It is now time to talk about how to overcome this problem using gas ballasting – how it is performed, its advantages and limitations. Let’s learn more.
Gas ballast is the introduction of a non-condensable gas (e.g., air or nitrogen) into a rotary-vane pump, during the compression stage to intentionally impact the efficiency of the pump thereby heating the oil inside and helping to drive out water and other condensed liquids present in the pump oil. In addition to rotary-vane pumps, it is also used in scroll pumps and piston pumps, to name a few. Wolfgang Gaede developed the gas ballast principle in 1935, which was first applied to rotary-vane pumps.