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Abnormal operating conditions (faults) in industrial processes have the potential to cause loss of production, loss of life and/or damage to environment. The accidents, which could cost industry billons of dollars per year, can be prevented if abnormal process condition is predicted and controlled in advance. Due to the increased process complexity and instability in operating conditions, the existing control system may have a limited ability to provide practical assistance to both operators and engineers. Advanced software applications, based on expert system, has the potential to assist engineers in monitoring, detecting, diagnosing abnormal condition and thus providing safe guards against unexpected process conditions.