Method for differentially pumping endblock seal cavity
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United States of America Patent
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Apr 7, 2009
Grant Date -
Mar 10, 2005
app pub date -
Aug 10, 2004
filing date -
Sep 9, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for providing a seal between a rotating part and a stationary part that comprises two seals in series separated by a cavity is disclosed. The cavity may be at low pressure and failure of either seal may be detected by a change in cavity pressure. An alarm may be triggered when cavity pressure rises above a threshold, or when it remains above a threshold for more than a predetermined period of time. In a system comprising multiple cavities, a cavity may be selectively isolated to determine if a seal associated with that cavity is experiencing a leak.
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