Unlike oil sealed ones, Liquid Ring Pump are capable of creating vacuum upto 710 mm hg only which is far less then what can be achieved by the former. But still are preferred in chemical & pharmaceutical industries. These prove economical and require less maintenance. Water is used in place of costly oil and no hassle of frequent oil changing. Require less energy to run and enjoys longer life. Even otherwise creates no pollution, no fumes and produces very little noise. higher vacuum through them can also be achieved when made to work as backing pumps in systems. They suite all applications covered by oil sealed pumps.