The global chemicals business is changing as Asian countries, particularly China, are experiencing an explosive growth in economy. What can American chemical businesses do to compete with this new giant in the industry?
This article is the first in a series of web-exclusive items designed to increase your knowledge about the HART Field Communications Protocol. Read here to find out the benefits of using HART Communication.
Author: Ed T. Ladd, Jr., HART Communication Foundation, Austin, Texas
Digital-based protocols, such as those used by fieldbus technology, are finding their way into a wider range of plant automation technologies. Read about the Fieldbus Foundation and how its technology can be implemented at your plant.
It has been nearly a decade since the Instrumentation, Systems and Automation Society (ISA) introduced S88, its first standard for batch control systems. Its still integral in optimizing operations today.
Install a flow meter in the recycle, cascade the flow set point with a pressure control loop. With proper tuning, the valve characteristics are lost in the flow control loop, which should be tuned fast with PI.