Abstract
Experience based on operation of approximately 300 totally oil-free reciprocating piston pumps, which produce ultimate pressures near one Pascal, will be discussed. Entirely oil-free continuous rough pumping of vacuum systems has produced some unique operational advantages. The source of the residual gas found in a system is now entirely independent of the roughing pump but pump contamination by the system is a real possibility and concern. The presence of water vapor in either the vacuum system or produced by the process is one of the major obstacles in totally dry rough pumping. A further source of system contamination not often considered comes from the improper installation and maintenance of the discharge lines and associated equipment. The influence of various contaminants including water vapor on pump performance in relation to wear, noise and ultimate pressure will be discussed. Using a reciprocating oil-free piston pump and new operational techniques, system and pump contamination can be essentially eliminated.
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