Tag Archives | process flow

PFD (Process Flow Diagram)

A diagram commonly used in engineering to indicate the general flow of plant processes and equipment. The PFD displays the relationship between major equipment of a plant facility and does not show minor details such as piping details and designations. Another commonly used term for a PFD is a flowsheet. Typically, process flow diagrams of a single unit process will include the following: process piping; major bypass and recirculation lines; major equipment symbols; names and identification numbers; flow directions; control loops that affect operation of the system; interconnection with other systems; system ratings and operational values as minimum; normal and maximum flow; temperature and pressure and composition of fluids.