Mechanical boosters on clean or corrosive applications

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Abstract
This paper discusses in detail the methods that are adopted to either reduce contamination of the oil in the coupling and gears from corrosive vapors in the system, or conversely ensure that the oil vapors cannot reach the high vacuum system. The method of sealing the mechanical booster pump interior from the oil boxes is described and the alternative ways of pumping these boxes are shown. The vacuum that can be achieved above a mechanical booster taking these precautions is given and the level of organic vapors determined by using both a quadrupole mass spectrometer and a quartz crystal microbalance.

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