scope:

This Practice addresses the format and content shown on a P&ID. The Practice is independent of time in a facility life cycle and encompasses design, construction, operations and maintenance.

This Practice covers the generation of new P&IDs and does not apply to the revision of existing P&IDs. It also applies to P&IDs provided by packaged equipment vendors.

A P&ID is a detailed graphical representation of a process including the hardware and software (e.g., piping, equipment, instrumentation) necessary to design, construct and operate the facility. Common synonyms for P&IDs include EFDs (Engineering Flow Diagrams), UFDs (Utility Flow Diagrams) and MFDs (Mechanical Flow Diagrams). This Practice applies to all diagrams that fit the definition of a P&ID.

The criteria presented in this Practice can be applied to whichever CAD system is employed for developing the P&IDs and are not vendor, hardware or software specific.

The example P&IDs included in the Appendices are not intended to recommend specific design details or requirements. Example P&IDs are included to provide an illustration of how the elements of the recommended Practice are combined into a P&ID.

Purpose

This Practice provides criteria for the development of Piping and Instrumentation Diagrams (P&IDs).