Control system for liquid ring pumps

A control system comprising:

• a suction line;
• an exhaust line;
• an operating liquid line;
• a liquid ring pump comprising a suction input coupled to the suction line, an exhaust output coupled to the exhaust line, and a liquid input coupled to the operating liquid line;
• an operating liquid pump configured to pump operating liquid into the liquid ring pump via the operating liquid line and the liquid input;
• a motor configured to drive the operating liquid pump;
• a first plurality of sensors configured to measure at least one parameter of an exhaust fluid of the liquid ring pump;
• a second plurality of sensors configured to measure at least one parameter of a fluid received by the liquid ring pump;
• and
• a controller operatively coupled to the first plurality of sensors, the second plurality of sensors, and the motor, and configured to control the motor based on sensor measurements of the first plurality of sensors and the second plurality of sensors, wherein the controller is configured to control the motor according to a function of ΔP, wherein ΔP is determined according to a function:
• ΔP=P1−P
• wherein P1 is a pressure of a fluid being received by the liquid ring pump via the suction line, and
• P=Pwv+Poffset
• where Poffset is an offset value, and Pwv is a vapour pressure of the operating liquid calculated by the controller based on the parameter of the exhaust fluid received from the first plurality of sensors.