June 2007

Special Report: Process/Plant Optimization

Model predictive control for liquefied natural gas processing plants

Applying this technology will increase your bottom line and improve operations

The earliest gas processing plants were typically controlled manually to meet operating requirements. Pneumatic control systems were quickly adopted. These systems used proportional, integral and derivative controllers sending analog outputs to control the valves. As long as a sensor is available as a process variable for the controller, then a setpoint given by the operator can be targeted automatically. Discrete control could also be accomplished with pneumatic control systems by using devices to fail with or without an air signal. In most cases, compressed air is used as the pneumatic conveyor. However, natural gas is used in some remote operations as well as hydraulic oils. A reliable

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