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Here is a simple process flow diagram example a process and instrument drawing pid includes more details than a pfd it includes both major and minor flows control loops and instrumentation pid is sometimes referred to as a piping and instrumentation drawing such diagrams are also called flowsheets pids are applied by process . A piping and instrumentation diagram pid is a detailed diagram in the process industry which shows the piping and process equipment together with the instrumentation and control devices superordinate to the piping and instrumentation diagram is the process flow diagram pfd which indicates the more general flow of plant processes and the relationship between major equipment of a plant . Both pfd process flow diagram and pid piping process instrumentation diagram are chemical process engineering drawings these drawings are very useful as they convey the right amount of process information as needed during various stages of bidding engineering design procurement construction operating commissioning phases of the . The process flow diagram is the primary source of information for developing the pidthe pid should define piping equipment and instrumentation well enough to cost estimation and for subsequent design construction operation and modification of the process material balance data flow rates temperatures pressures and piping fitting