Liquid ring pump control

A method for controlling a system, the 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;
• and a motor configured to drive the liquid ring pump;
• the method comprising:
• measuring, by a first sensor, a first parameter, the first parameter being a parameter of an exhaust fluid of the liquid ring pump;
• measuring, by a second sensor, a second parameter, the second parameter being a parameter of a gas being received by the liquid ring pump via the suction line;
• calculating, by a controller operatively coupled to the first sensor, the second sensor, and the motor, a vapor pressure of an operating liquid based on the equation:
• P
• wv
• =
• A
• *
• 10
• (
• m
• *
• T
• 1
• T
• 1
• +
• T
• n
• )
• where A is a constant, m is a constant, Tn is a constant, and T1 is the first parameter;
• and
• controlling, by the controller based on based on a function of the second parameter and the vapor pressure of the operating liquid, the motor.