Vacuum compression applications are commonly used in processes such as distillation, degassing, dry stripping, solvent recovery, evaporation, filtration, crystallization, exhaust gas compression, steam recovery, reactor service, and gas pressurization.

Many vapors/streams that require compression in the process industry are toxic, explosive, reactive, corrosive, wet, or saturated. When you evaluate the vacuum technology required for a process, the first thing to do is to eliminate pump systems that do not meet process conditions, such as discharge pressure, gas inlet temperature, capacity, and vacuum degree.

The next step required for evaluation is to review the operating characteristics that arise when the gas/steam is compressed. Any process that requires you to consider the effects of gas/steam pollution.

Liquid ring pumps are capable of handling the dirtiest processes. They are highly tolerant of harsh environments as it is also for aggressive saturated air that may or may not contain steam loads. Vacuum pumps and compressors using liquid ring technology can also act as direct contact condensers. When they need to handle a highly condensable steam load, condensation occurs within the liquid ring and leads to increased pump efficiency, resulting in an increase in pumping speed on the performance curve (cubic feet per minute/horsepower).

Vacuum pumps using dry screw technology are more suitable for relatively dry and clean airflow, as well as zero tolerance for any process contamination.

These pumps can reach deeper partial vacuum levels, which must be considered when you need vacuum levels below 10 torr, even in these applications where multistage liquid ring systems can be used.

There is only one moving part in the liquid ring pump design, the impeller/shaft assembly. The bearings in these designs are located outside the pump, in the rotating parts and in the housing, and there is never any contact between metal and metal.

These design features make the maintenance and maintenance of the liquid ring pump easy. In most industrial applications, oil-sealed liquid ring pumps can be used for 10,000 hours without an oil change, and even this oil change is simple and inexpensive, thus eliminating the need for expensive contracts with technicians.

In the case of dry screw pumps, the lubricating oil in the gear chamber needs to be replaced and the inlet filtration system needs to be maintained due to the tight internal clearance.

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