Controlled variables checklist

Completeness is hard to achieve By verifying checklists for the manipulated variables and controlled variables, omissions can be avoided as much as possible. When developing the behavioral model, it is still required to feedback to the environmental model. 

Skill-based Errors manual variability strong but wrong action sequences Train for physical and manipulative skills (repeated practice and feedback) Checklists setting out starting and finishing activities and checks Layout and labeling of controls and process lines Distinguish tetween plant areas with similar appearance but different functions Provide feedback... 

After a controller has been designed, built, and tuned in an off-line environment, the next big step is to install it in the plant computing hardware and commission it. Since, at this stage, it becomes possible for the controller to directly modify how the plant is running, one must proceed methodically and with caution. Use checklists. Be observant and, at least initially, monitor all of the variables related to the controller frequently and thoroughly. Below is a good suggested procedure. 

Used to define and measure the effect of variables outside the control of an organisation, PEST is an acronym of the four categories of change - political, economic, social, and technological. A broad-brush instrument, it constitutes an environmental checklist of the external elements that augment... 

Data collection gathers information about feed composition, overhead purity, and bottom purity. Three analyzers are placed in each of these streams to allow each process technician on shift to monitor and record the process. Figure 12-6 shows information collected from the overhead line. In addition to the product lines, data is collected continuously on each control loop, and alarms are located on key equipment. A unit checklist is filled out during every shift as part of the data collection process concerning unit variables. 

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