General Recipes As Contracts With ManufacturingDownload Now
General recipes are the ANSI/ISA 88s definition of how to document the way a product is manufactured without specifying the exact production equipment. General recipes are transformed through an engineering process into master recipes, and they can often map to a wide range of physical equipment layouts. The target equipment often varies in unit layout, level of automation, physical properties, and process control capability. Usually, local engineers with a deep understanding of the target process cell layout do the transformation from a general or site recipe to a master recipe. The general recipe thus becomes the controlling document that is exchanged between sites. The general recipe can be considered a contract document between Research & Development (R&D) and manufacturing, defining the chemistry and physics that must be performed to manufacture the product. Because this document must be unambiguous, the elements that make up the general recipe must also have an unambiguous definition. In the ANSI/ISA 88 model these elements are process actions and equipment constraints. The actions and constraints are used during master recipe creation to identify master recipe unit procedures and operations and to bind the master recipe unit procedures to equipment. This paper defines the rules and considerations in defining corporate-wide process actions and equipment constraints so that they can become the complete and unambiguous definitions required by manufacturing.