Consider the liquid storage system in Fig. E8.13. Suppose that q 1 must be kept constant, and,

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Consider the liquid storage system in Fig. E8.13. Suppose that q1must be kept constant, and, consequently, h2is to be controlled by adjusting q2. Suppose that the q2control valve is fail-close. Should the level controller for h2be reverse acting or direct-acting?

92 96 h2 LT hi 95 LT 94 q3 Figure E8.13

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Process Dynamics and Control

ISBN: 978-1119385561

4th edition

Authors: Dale E. Seborg, Thomas F. Edgar, Duncan A. Mellichamp, Francis J. Doyle

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