How to Size Liquid Ring Vacuum Pumps


Liquid ring vacuum pumps are commonly used to handle gas or “wet” gas mixtures (i.e., gas containing condensable vapors and steam), and powder gas without granule.

An impeller is installed eccentrically in pump casing. As the impeller rotates, it throws water by centrifugal force to form a so called liquid ring. The liquid ring creats a space between the impeller blades. As the impeller further rotates, the spaces between impeller vanes are reduced, so that the gas is compressed and is forced out the outlet port.

To size liquid ring vacuum pumps, following information is needed:

  • inlet pressure, usually expressed in mm Hgor hpa

  • inlet gas temperature

  • liquid (usually water) flow rate, usually expressed in L/hor L/min and the molecular weight of fluid components

  • vapor pressure data for each fluid component

  • seal fluid data, if other than water: specific gravity, specific heat, viscosity, thermal conductivity, molecular weight and vapor pressure data

  • seal fluid or cooling water temperature

  • discharge pressure


Each of these factors influences the sizing of the liquid ring vacuum pump.

Sizing and selection of suitable liquid ring vacuum pump requires full information concerning not only what fluids the pump will handle, but how it will be operated.

If you need any kind of pumps, welcome to contact with us,we will select suitable model for you, just send us pump application industry, processed gas details, working condition etc.

Or you can check our liquid ring vacuum pump collection.


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