This is a USSD charge existing process flow diagram. A process flow diagram is a type of diagram often used in chemical and process engineering to show the general flow of plant operations and equipment. It aims to illustrate all models and mappings associated with a process. It is a form of flow chart that is frequently used in chemical and process engineering. It is used to document a process, enhance an existing one, or design a new one. Now it is easy to create a process flow diagram on EdrawMax.