A complete fault detection and isolation system is designed for a gas-liqui
d separation unit. It involves the determination and identification of grey
box models, the design of a model-based residual generator, and finally th
e evaluation of the residuals via a set of statistical tests. The latter ar
e cumulative sum (CUSUM) tests which are combined in such a way that both f
ault detection and fault isolation can be achieved. The performance of the
resulting diagnosis system, such as missed alarm rate: wrong isolation rate
and mean detection delay, are studied via simulations. (C) 2000 Elsevier S
cience Ltd. All rights reserved.