What are the differences in the drawing methods between PID diagrams and PFD diagrams from a process engineering perspective, and what are the differences in their content?
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What are the differences in the drawing methods of PID and PFD from a process perspective, and what are the differences in their content? Could I see some sample diagrams? Thank you!
Oh, I forgot to ask – what is a PAD diagram?
A PID diagram is primarily a process control PFD, which requires very detailed flow data.
PFD stands for Process Principle Flow Diagram, and it shows the main processes, the primary control logic, as well as the key material and heat balances. There is no need to illustrate any auxiliary processes; many of the valves in the main process also do not need to be drawn, only the control valves of the main process are shown. A PID is a detailed process and instrument control diagram; theoretically, this diagram should show every line and every valve present in the actual installed plant, without any omissions.
PID is a piping and instrumentation diagram that includes all the pipelines and valves on site, detailing every instrument and electrical signal. A PFD is a material balance diagram that shows the main process pipelines and the composition of the materials within those pipelines.
Sir, do you have any sample PFD diagrams? I’d like to see how material pipeline diagrams are drawn. Thank you!