In this course, we will learn how a petroleum refinery interacts with other systems such as instrumentation technology and information technology. The interaction of a petroleum refinery, instrumentation technology, and information technology happens through a system called an interface. A refiner could own and develop the process and system interface or use a system developed and owned by other providers, known as vendor companies. They usually offer full service or customer service. The processes and systems from a refining unit will connect to instrumentation and information technology such as a plant process database (PI, Ph.D.), ODBC interfaces (LIMS, ATG), and excel drives (PIMS) through interfaces. This topic will discuss process and systems interfaces, offline blend optimizer interfaces, tank quality tracking system interfaces, online blend control interfaces, offline/online blender interfaces, oil movement interfaces, etc.