Batch Control Systems: Design, Application, and Implementation, 2nd Edition

Batch Control Activities

Recipe Translation

The amount of effort that is required to translate a general or site recipe into a master recipe depends on the degree of matching between the general and master procedural elements. 88.00.03 contains a thorough explanation of general recipes and the translation process.

88.01 recommends that you keep everything on a process function basis until you get to the equipment phases. This makes it very likely that a process function that is required by a general recipe will have a counterpart in the set of master recipe procedural elements. Further, it is very likely that some equipment entity has an equipment phase with the same name that performs the process function, no matter what kind of equipment actually does the processing.

When you are faced with an operating process that does not have an 88 recipe structure then it is best to start with the equipment and not the recipes. Identify the process functions of each piece of equipment, perhaps finding other functions that the equipment could perform. Combine as many similar functions as possible into one equipment phase. Then build a set of equipment phases and write descriptions of their behavior.

Give the descriptions to the recipe authors. Ask them if this is an adequate set or if they need other process functions. Additional functions should be rare, given that this is an operating plant. Give the final descriptions to the control engineers. Ask them to upgrade the equipment control systems so that they...

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