scope:

This Practice provides general guidelines for the format and content of Process Flow Diagrams (PFDs) for process and utility systems.

This Practice covers the development of new PFDs and does not apply to existing PFDs developed before the adoption of this Practice.

The Practice applies to all diagrams that fit the definition of a PFD in Section 3. This Practice can be applied to any CAD system used for developing PFDs and is not vendor, hardware, or software specific.

Although this Practice provides general guidelines for the development of PFDs, individual applications may require differing approaches than those recommended in this Practice. Determinations concerning fitness for purpose and matters of application of the Practice to a particular project or engineering situation should not be made solely on the information contained in this Practice.

Example PFDs in the Appendixes of this Practice are not intended to recommend specific design details or requirements, but are included to provide illustrations of various options available to the user.