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Natural Gas Processing by Alireza Bahadori

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15.16. Piping & instrumentation diagrams (P&IDs)

The P&ID, based on the PFD, represents the technical realization of a process by means of graphical symbols for equipment and piping together with graphical symbols for process measurement and control functions.
The Utility Flow Diagram (UFD) is a special type of a P&ID that represents the utility systems within a process plant, showing all lines and other means required for the transport, distribution, and collection of utilities. The process equipment in the UFD can be represented as a box with inscription (e.g. identification number) and with utility connections.
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FIGURE 15.8 Typical symbols, lines, ...

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