Process Flow Diagram (PFD) is a drawing which essentially captures the process flow for a processing plant.
PFD is used to capture the main process equipment’s, main process stream, process/design conditions in these equipments and the basic process control scheme in a single drawing.
Entire process of a plant can be described using a few interconnected PFDs.
Some items which appear on the P&ID but may not appear on the PFD are – safety valves, detailed instruments, lines, fittings, drains vents and tag numbers for all of them.
A variation of the process flow diagram is a utility flow diagram (UFD) which captures the essence of utilities required for the process such as, steam, nitrogen, water etc.
The process flow diagram below depicts a single chemical engineering unit process known as an amine treating plant:
Article Source : Instreng
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