A liquid ring vacuum pump is easy to operate and is utilized in several applications across various industries. A liquid ring pump works with a sealant needed in its operation. This liquid can be water, oil or any additional 
solvent which is oil-free air compress rotated by an impeller within the casing of the pump.
The typical oil used in a sizable rotary piston vacuum pump is a mineral oil that is through a distillation process to reduce its vapor pressure. These vacuum pumps possess an ultimate vacuum, occasionally called “blank off” vacuum, of 0.010 Torr (10 microns, 1 x 10-2 Torr or 0.0133 mbar).