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Process flow diagram
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<p>A process flow diagram (PFD) is a diagram commonly used in <a href="/facts/Chemical_engineering/Fb64amQf">chemical</a> and <a href="/facts/Process_engineering/tgNFNxwD">process engineering</a> to indicate the general flow of plant processes and equipment. The PFD displays the relationship between <i>major</i> 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 <i>process</i> <i>flowsheet</i>. It is the key document in process design. </p>