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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 & better can easily be expected. Mechanical Boosters offer a completely dry pumping solution and do not add to any vapor load, unlike steam ejectors, and therefore, do not require large inter stage condenses. At low vacuums, higher pumping speeds are required to maintain the through-put, since the specific volume increases with the increase in vacuum. Vacuum boosters enhance the pumping speeds by about 3-10 times depending upon the selection by virtue of which one can expect higher process rates and through-puts. The drawbacks of steam ejector system such as sensitivity to motive fluid pressures and discharge pressure are overcome easily by the Mechanical Boosters, since the volumetric displacements/pumping speeds are insensitive to the inlet & outlet working pressures.

Typical Booster Installation.

(1) Evaporator (2) Gauge (3) Condenser (4) Mechanical Booster. (5) backup Pump.

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  1. Everest ................. Leaders in Vacuum Booster Technology Boosters for Vacuum Process © Everest Transmission January, 2005.
  2. Calculating the Pump Capacity: - Based on the fundamental gas laws PV= RT, an expression can be derived for Volumetric Flow Rates required for pumping different vapors/gases. Based on the Mass flow rates one can estimate the pump capacity required.

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V = R . Tgas / P Q1/M1 + Q2/M2 ............. Qn/Mn. Where V = Inlet Volume flow rate m3/hr. R = Universal gas Constant, 83.14 mbar m3/ Kgmol x ºK

Tgas = Gas/Vapor abs. Temp, in ºK

P = Process Absolute Pressure in mbar.

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Q1, Q2, Q3 = Gas / Vapor flow rate, in Kg/hr.

M1 , M2 ,M3 = Molar mass, in Kg/mol. of gas /vapor.

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