Compressor Controls Corporation

Paul Marvin Negley

Saul Mirsky

Naum Staroselsky

Michael Lev Tolmatsky

Serge Staroselsky

Paul A Reinke

John Tse

Robert J Sibthorp

Automatic testing for control valves is provided for diagnosing of actuators, including actuators not equipped with analog or discrete position transmitters. A valve controller confirms steady-state conditions for a turbo-compressor system that includes a control valve in a first position and sends, to an actuator for the control valve, a signal to initiate a partial valve stroke to move the control valve away from the first position. The valve controller receives feedback signals from sensors in the turbo-compressor system and monitors the feedback signals for a change from the steady-state conditions. When the monitoring detects a change from the steady-state conditions within a defined time period, the valve controller sends, to the actuator, a signal to return the control valve to the first position. When the monitoring does not detect a change from the steady-state conditions within the defined time period, the valve controller generates an alarm signal.

System and method for detecting deterioration of a control valve

A method and apparatus for maintaining a main process gas parameter such as suction pressure discharge pressure, discharge flow, etc. of a compressor station with multiple dynamic compressors, which enables a station controller controlling the main process gas parameter to increase or decrease the total station performance to restore the main process gas parameter to a required level, first by simultaneous change of performances of all individual compressors, for example, by decreasing their speeds, and then after operating points of all machines reach their respective surge control lines, by simultaneous opening of individual antisurge valves. In the proposed load-sharing scheme, one compressor is automatically selected as a leading machine. For parallel operation, the compressor which is selected as the leader is the one having the largest distance to its surge control line. For series operation, the leader has the lowest criterion 'R' value representing both the distance to its surge control line and the equivalent mass flow rate through the compressor. The leader is followed by the rest of the compressors, which equalize their distances to the respective surge control lines or criterions 'R' with respect to that of the leader.

Load sharing method and apparatus for controlling a main gas parameter

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Urbandale, IA, United States of America

Paul Marvin Negley