Process Flow Diagrams (PFD) – Creative Engineers, Inc.

Process flow diagrams (PFD) describe a manufacturing process in terms of the various steps involved and the inputs and outputs from those steps. This is often the initial document generated in a new process, as it gathers the data known, sets the process operating conditions, and allows the sizing of equipment. The PFD usually refers to a mass and energy balance,which is often incorporated right into the diagram in the form of a table.

Typical information on a PFD includes:

  • Blocks for each unit operation
  • Lines indicating the flow of materials (process streams)
  • Lines indicating the flow of energy
  • Unique identification of each steam and energy input or output

When the mass and energy balance is included on the PFD, it will include information such as:

  • Materials, chemicals, and utilities such as steam, hot oil, air, etc.
  • Total flows, flows per unit time or other rate information
  • Physical properties of materials if necessary
  • Conditions such as temperature, pressure, quality, etc.
  • Other information that may be helpful for those preparing the P&ID or equipment or piping specifications

> Also see Piping and Instrumentation Diagrams (P&ID)

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graphic example of typical process flow diagrams (PFD)