We attempted to use data and testing to identify the point at which operators are engaged but not overwhelmed.
Control Room Operators are relied upon to control chemical processes both safely and profitably. The effectiveness of which is impacted by their ability to control the process timely. Results of this project could help ensure that console operators do not become overloaded.
How many control changes can an operator handle before performance declines?
How can the metrics be described?
How does complexity impact the metrics?
How does Batch differ from continuous?
How do we measure the level of automation in the metrics? (State-based control, automated startup / shutdown sequences, etc.)
Does the quality of HMI impact the metrics?
Operator performance as a function of workload is an inverted “U”, with high and low workload degrading performance. Excessive workload was cited as a potential contributing factor to the fire and explosion at then BP’s Texas City Refinery in 2005. However, the actual limits of the contributors to console workload are only partially known.
A previous COP study established some of the limits for alarm rates. Control changes are another major contributor to operator workload whose impact needs to be quantified. Most systems that provide statistics on alarm system performance also track console operator changes. Correlation to operator performance is needed.
In addition to the monthly and final reports, the project will provide a process for determining the operational load zones and evaluation techniques for testing and monitoring. Additionally, suggestions for future extensions of this work will be provided. The PI will clear all presentations and publications through the COP and industry partner prior to submission.