Overall PFDs

Overall PFDs are developed to show:

Entire facility on a single drawing
applies to Offshore Platforms and Onshore Process Plants

Examples:

Overall process facilities
Overall tankage and loding/unloading facilities
(for onshore process plant)
Major utilities distribution networks
e.g. Hot Oil, Cooling Water, Compressed Air, Steam (for Onshore Plant)

Identify different process units or sections
e.g. use lines to demarcate production, compression, fuel gas, compressed air etc

Show interconnections