Interpreting Lines on PFDs and P&IDs

Interpreting Lines on PFDs and P&IDs
R. Russell Rhinehart
20 min
Article / Blog

Lines on a process flow diagram (PFD) indicate material flow.  In contrast, on a piping and instrument diagram (P&ID), the control overlay for the PFD, the lines represent information flow.  Material and information conveyance are different, and you need to understand the difference to understand the P&ID and, more so, to design a control strategy.



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