Abstract: Systems for evacuating process fluids having condensable and incondensable components, especially those including corrosive constituents, include a condenser for condensing at least part of the condensable component and discharging the condensate from the system, a jet diffuser supplied with atmospheric air as a motivating fluid for diluting and increasing the pressure of the uncondensed portion of the process fluid, and a liquid ring suction pump for further increasing the pressure of the diluted uncondensed process fluid and discharging it from the system.

Abstract: Purging passages are machined or cast into the casing of a liquid ring compressor through which soluble or nonsoluble contaminants which may be present in the liquid ring may be removed from the compressor. These passages in single lobe pumps are located in the outer peripheral zones of the casing approximately 240.degree. from the pump land in the direction of rotation of the rotor in the area of the drive and idle ends of the rotor.