De-sludging systems
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United States of America Patent
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Nov 10, 1992
Grant Date -
N/A
app pub date -
Feb 1, 1991
filing date -
Feb 8, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
Apparatus for periodically drawing accumulated sludge (12) from a settlement tank (10) includes a hydraulically powered ram type positive displacement pump (14), operation thereof being controlled automatically in a timed or other sequence in response to signals derived from a pressure transducer (34), conveniently in the hydraulic supply line (24), said signals being a function of the pressure exerted by the pump ram (22) in operation and hence the density or other properties of the material being handled by the pump, a higher pressure showing the presence of sludge and a lower pressure its absence.
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