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Oil sealed vacuum pumps such as vane and piston pumps can tolerate a certain amount of water and other condensable vapors such as alcohols, acetone, and solvents. For the integrity of the sealant oils, and to achieve a good vacuum (lower than the vapor pressure of the liquid), it is best to prevent the condensables from entering the oil sealed vacuum pumps or removing them after they do enter the vacuum pump. The following discusses various methods for this removal and mostly refers to the condensate as water. The discussion of water is also applicable to other vapors and liquids, especially ones having a vapor pressure close to or higher than water. Trapping and filtering condensable vapors upstream of the...Full Article