October 2008

Special Report: Process Control and Information Systems

Fault-tolerant control protects processes and products

The benefits include automatic recovery from faults, improved safety and prevention of severe product contamination

Kettunen, M., Koivisto, K., Neste Oil Oyj; Leger, J-B., Predict; Liikala, T., Sourander, M., Neste Jacobs Oy; Sauter, D., Universite Henri Poincare

Preparing for process upsets caused by faults is shown to prevent substantial economic losses and to enhance safety. These newly developed fault-tolerant control (FTC) technologies led to a decisive improvement in plant safety, product quality and process economy. Neste Oil Oyj reports consistent automatic recovery from faults, improvement in safety, and prevention of severe product contamination due to a novel FTC technology applied to a solvent dearomatization unit operated under multivariable model predictive control (MPC) in the Neste Oil Naantali Refinery, Finland. The economic losses attributable to an off-spec product tank content can grow to several million $US depending on the tan

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