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Some of Tai-Ji’s main features include:
Meanwhile, Process Doctor prepares the application for its step test by surveying regulatory controller performance, and identifying bad actors, such as controllers that aren’t performing well, and helping to determine if they need tuning, maintenance, or repair. Once the regulatory controllers are working well, the step test is ready to begin.
Tkatch says users should ensure that their data is being archived in at least two different places, set up the Tai-Ji modeling analysis using common sense combinations of variables, and keep the model analysis setup simple, but inclusive. Then, after approximately 24 hours of stepping, models can be run. Model results are graded using estimated error bounds, including:
Tkatch adds that model identification is successful if most expected models have A and B grades, but this doesn’t not mean that all models must be A or B. Next, he advises users to:
So far, Hovensa has now used Tai-Ji for stepping and model identification on five process units. These include revamping its Crude Unit 6 in 2005 with two sub-controllers on its crude tower and stabilizer; revamping its fluid catalytic cracking (FCC) unit in 2006 with three controllers; and revamping its BTX unit and distillate desulphurization unit in 2007. Tkatch adds that Hovensa plans to conducted closed loop tests on its Crude Unit 5 and Vacuum Unit 3 this year.