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By Margaret Walker, Ed Sederlund, Jerry Gipson and Eric Cosman, The Dow Chemical Company
Innovation has always been at the heart of The Dow Chemical Company (Dow), Midland, Mich., and today it is the essence of its stated mission “to constantly improve what is essential to human progress by mastering science and technology.” To achieve this mission, we are committed to the principles of sustainable development and to achieving the triple bottom line of economic, social and environmental progress. These principles form the basis of our philosophy and approach to process automation.
For more than 100 years, Dow has been striving for true “operational excellence,” long before the term was coined by industry analysts. Over the past 30 years alone, we have evolved a standardized, redeployable process control strategy that supported our goals of overall consistency, productivity improvements, global operating discipline and innovation—all while maintaining high safety performance.
Indeed, consistency and sustainability are the foundation of that strategy. As a global company, it’s important to operate facilities in the same way every single day to achieve consistently high quality, process reliability and repeatability of best practices. Consistency and sustainability are paramount to global competitive advantage, enabling us to drive down costs while earning us the right to grow.
In the first article in this series, “The MOD Squad: Process Automation at Dow,” we described how our process control strategy led to the development of a series of proprietary process control systems, culminating in the MOD 5. That system—still in use today—has several capabilities that are not commonly available in many commercial systems. Each of these capabilities was developed in direct response to a specific business need. As a result, the application of this system has resulted in tremendous productivity benefits.
However, in early 2000, due to the speed of changing technology, we realized it would not be cost-effective to continue to invest in proprietary hardware and software systems. We needed to focus on our core manufacturing business without losing the advantages that we had gained.
After a detailed analysis of the capabilities of the MOD system, we defined a set of high-level criteria that we consider essential to any commercial process automation system. This process was described in the second article in this series, “Process Automation at Dow: Part 2.” Each criterion corresponds to a specific value that we have achieved with our proprietary MOD system.
One criterion for process automation is directly related to increasing process availability. According to a November, 2006, report from ARC Advisory Group, about five percent of production in the process industries—valued at $20 billion a year in revenues—is lost to unscheduled downtime. Most of this, says ARC, could be readily avoided through improved automation capabilities.
As part of an ongoing collaboration with Dow, industrial automation system vendor ABB recently introduced the “Load-Evaluate-Go” feature for its industrial IT System 800xA. The newest version of System 800xA includes new engineering functions that enable one to make changes to a copy of the running program, and then load that copy into the running production system with the old version of the program. This, in turn, makes it possible to evaluate the impact that such changes would have on the production process by examining the differences between the “old running program” and the intended “new program.” It is then possible to choose to commit to the new program or back out of it with the old program still running, make necessary changes, and go through the process again. This capability provides two key benefits. First, it significantly reduces the risks associated with making application changes in the running process. Second, it improves overall efficiency by avoiding production stops, missed or delayed product deliveries, and costly downtime.
Load-Evaluate-Go complements other jointly developed elements of System 800xA, including the innovative System 800xA High Integrity combined control and safety option. With embedded safety and control within the same flexible architecture, it is possible to combine control and safety functions within the same controller, or to keep control and safety functions separate within the same system. This improves process availability while reducing risk to overall plant operation by providing a common high-integrity system environment for production control, safety supervision and production monitoring.
Well before any real collaborative development took place, however, the foundation for a true collaborative relationship needed to be established. The beginning of this process was described in the third article in this series, “Collaborative Process Control: The Dow/ABB Story.” Over time, Dow and ABB have forged a relationship that nurtures ongoing development activities. This relationship consists of four key elements of collaboration:
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