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A process flow diagram (PFD) is a diagram commonly used in chemical and process 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''. ==Typical content of a process flow diagram== Typically, process flow diagrams of a single unit process will include the following: * Process piping * Major equipment items * Control valves and other major valves * Connections with other systems * Major bypass and recirculation streams * Operational data (temperature, pressure, mass flow rate, density, etc.), often by stream references to a mass balance. * Process stream names Process flow diagrams generally do not include: * Pipe classes or piping line numbers * Process control instrumentation (sensors and final elements) * Minor bypass lines * Isolation and shutoff valves * Maintenance vents and drains * Relief and safety valves * Flanges Process flow diagrams of multiple process units within a large industrial plant will usually contain less detail and may be called ''block flow diagrams'' or ''schematic flow diagrams''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Process flow diagram」の詳細全文を読む スポンサード リンク
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