PROCESS CONTROL-Conclusion: Ethylene plant uses best practices to improve controller performance

Nova Chemicals Corp. used a holistic, best-practices approach to help sustain and improve the performance of control system assets at its Joffre, Alta., ethylene plant.This article, the second of two, will discuss a case study that describes the maintenance of a multivariable predictive control (MPC) controller, quickly identifying problems in the MPC itself, and in the regulatory control and instrumentation layers.The first part (OGJ, Oct. 9, 2006, p. 52) discussed MPC systems, causes of poor performance, and the best-practices approach.NOVA Chemicals case studyNOVA Chemicals Corp. operates three ethylene plants and two polyethylene plants at Joffre, Alta. This case study describes a DMC...

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