Process Flow Diagrams
PFDs, also called process flow charts, are a step up from the BFD in the amount of information and data it contains. The PFD contains most of the data necessary for the design of a process.
Process Flow Diagram: Note numbered circles used to follow the process.
They show all main flow streams including valves to help understand the process as well as pressures and temperatures on all feed and product lines within all major vessels and in and out of headers and heat exchangers, and points of pressure and temperature control.
- Information on construction materials, pump capacities and pressure heads, compressor horsepower, and vessel design pressures and temperatures are shown when necessary for clarity.
- Process flow diagrams usually show major components of control loops along with key utilities.
For more information on process flow diagrams see: The Engineering ToolBox.
Knowledge Check Choose the best answer for the question.
3-5. Which type of diagram is more complex and shows main flow streams, valves, pressures, and temperatures within vessels?
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