Pumps – With condition responsive pumped fluid control – Plural separate sensing means for a single fluid controller
Patent
1991-12-05
1993-03-23
Bertsch, Richard A.
Pumps
With condition responsive pumped fluid control
Plural separate sensing means for a single fluid controller
417300, 415 27, F04B 4900
Patent
active
051958759
ABSTRACT:
Method and apparatus for operating a compressor to avoid surge conditions. The compressor is controlled by determining a surge line for the compressor as a function of compression ratio and the flow coefficient (M.sqroot.RTZ)/P.sub.s ; measuring the differential head, h, across a flow element, the suction pressure, P.sub.s, and the discharge pressure, P.sub.d ; generating a process signal that is a function of P.sub.d /P.sub.s and .sqroot.h/P.sub.s and comparing the process signal with a set point signal to control recycling of discharge flow to the inlet flow to prevent operation of the compressor in surge conditions.
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Bertsch Richard A.
Dresser-Rand Company
Freay Charles G.
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