Abstract
Valve stiction is one of the most prominent problems in chemical process monitoring. In each, chemical plant there are 500 – 5,000 process control loops, most of them have fluid as their main element and need valves as the primary control equipment. As those valves tend to have irregular maintenance and stick regularly. While the problem itself is not a big deal, when combined with how typical controllers in the industries work, it causes limited oscillations in the fluid flow rate as well as all related state variables of the process. Several surveys showed that valve stiction is a cause of around 20-30 % of oscillation problems, it is the main problem in process monitoring so many automatic valve stiction detection models have been developed such as Choudhury’s model, Kano’s model, and He’s model. This paper proposes the study of valve stiction by He’s model to predict by simulated valve characteristic transfer function affecting the water tank process.
