PFD vs P&ID Explained with a Practical Level Control Automation Example
PFD and P&ID comparison with a practical level-control loop. Quick Summary A Process Flow Diagram, or PFD, explains the overall process and its major equipment. A Piping and Instrumentation Diagram, or P&ID, provides the detailed information required to understand piping, valves, instruments, control loops and process-safety functions. Process engineers, production teams, maintenance personnel and automation engineers frequently use PFDs and P&IDs. Although both drawings represent the same process, they are prepared for different purposes and contain different levels of detail. In this article, we will compare a PFD with a P&ID and then examine a practical automatic level-control loop for a storage tank. 1. What Is a Process Flow Diagram? A Process Flow Diagram, or PFD , provides a high-level representation of a manufacturing process. I...