Booster Pumps

MECHANICAL VACUUM BOOSTERS:-Mechanical Vacuum Boosters are dry pumps that meet most of the ideal vacuum pump requirements. They work on positive displacement principle and are used to boost the performance of water ring /oil ring /rotating vane /piston pumps and steam or water ejectors. They are used in combination with any one of the above mentioned pumps, to overcome their limitations. Vacuum booster pumps offer very desirable characteristics which make them the most cost effective and power efficient option.The major advantages are:-(a) Can be integrated with any installed vacuum system such as Steam Ejectors, Water Ring Pumps, Oil Sealed Pumps, Water Ejectors, etc.(b) The vacuum booster is a Dry Pump as it does not use any pumping fluid. It pumps vapor or gases with equal ease. Small amounts of condensed fluid can also be pumped.(c) Vacuum boosters are power efficient. Very often a combination of Vacuum Booster and suitable backup pump results in reduced power consumption per unit of pumping speed. They provide high pumping speeds even at low pressures.(d) Boosters increase the working vacuum of the process, in most cases very essential for processperformance and efficiency. Vacuum Booster can be used over a wide working pressure range,from 100 Torr down to 0.001 Torr (mm of mercury), with suitable arrangement of backup pumps.Everest ...................... Leaders in Vacuum Booster Technology Boosters for Vacuum Process © Everest Transmission January, 2005.(e) It has very low pump friction losses, hence requires relatively low power for high volumetricspeeds. Typically, their speeds, at low vacuums are 20-30 times higher than corresponding vanepumps / ring pumps of equivalent power.(f) Use of electronic control devices such as Variable Frequency Control Drive allow to modifyvacuum boosters operating characteristics to conform to the operational requirements of the primevacuum pumps. Hence they can be easily integrated into all existing pumping set up to boost theirperformance.(g) Vacuum boosters don't have any valves, rings, stuffing box etc., therefore, do not demand regular maintenance.(h) Due to vapor compression action by the booster, the pressure at the discharge of booster (or inlet of backup pump) is maintained high, resulting in advantages such as low back streaming of prime pump fluid, effective condensation even at higher condenser temperatures and improvement of the backup pump efficiency.The Table below gives a rough estimate of how the boosters enhance the working vacuums of the processes when installed in combination with various types of industrial vacuum pumps currently used in the industry. They can effectively replace multistage steam ejectors, resulting in considerable steam savings and reduced loads on cooling towers. Mechanical Vacuum Boosters are versatile machines and their characteristics depend largely on backing pump. Various types of backing pump can be used, depending upon the system requirement and ultimate vacuum needs.However, the final vacuum is governed by the suitable selection of the backing pump and boosterarrangement. The table below gives a broad range of vacuum achieved with various backing pumps combinations.Vacuum Pump Expected vacuum Vacuum on installation Range of Booster (single stage)Single Stage Ejector 150 Torr 15 - 30 TorrWater Ejector 100 Torr 10 - 20 TorrWater Ring Pump 40 - 60 Torr 5 - 10 TorrLiquid Ring Pump 20 - 30 Torr 2 - 5 TorrPiston Pumps 20 - 30 Torr 2 - 5 TorrRotary Piston Pumps 0.1 Torr 0.01 TorrRotary Vane Oil Pump 0.01 - 0.001 Torr 0.001 - 0.0001 Torr.Everest ................ Leaders in Vacuum Booster Technology Boosters for Vacuum Process © Everest Transmission January, 2005.For example, if a process is using water ring Pump, the estimated working vacuums would be of the order of about 670-710 mmHg gauge (90-50 mmHg abs.), largely depending on the water temperature and pump design. When a Booster is installed prior to the water ring pump, in series, the vacuum levels of the order of 5-10 Torr can be easily achieved. In a Multi-Stage booster installation, vacuum levels of the order of 0.5 Torr

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