1. What information is required to select a liquid ring vacuum system?
Please provide the required operating vacuum, pumping capacity, gas composition, inlet temperature, condensable vapour content, operating duration, cooling-water conditions and installation environment. If the gas is corrosive, toxic or contains solvents, please also provide its concentration and material compatibility requirements. Based on these parameters, we can select the pump size, working liquid, heat exchanger, separator and control configuration.
2. Can the working liquid be recycled in a closed-loop system?
Yes. A closed-loop liquid ring vacuum system circulates the working liquid through a gas-liquid separator and heat exchanger before returning it to the pump. This arrangement reduces water consumption and wastewater discharge. Water, compatible process liquids or selected solvents may be used depending on the pumped medium. In some applications, using the process solvent as the working liquid can also improve solvent recovery.
3. Can a liquid ring vacuum system handle corrosive gases and condensable vapours?
Yes. Liquid ring vacuum systems are particularly suitable for wet gases, condensable vapours and certain corrosive media. The sealing liquid can condense part of the vapour and improve pumping performance. For corrosive service, the pump material, seals, piping and protective coating must be selected according to the gas composition and operating temperature. Optional corrosion-resistant materials and coatings are available after a process review.
