TABLE OF CONTENTS Piping and instrumentation diagrams (P&IDs) are the foundation of the I&C engineering package of deliverables. The P&ID is a multidiscipline drawing that presents information from the piping, process, I&C, systems integration, and electrical departments. The P&ID is the "daughter" of the process flow diagram (PFD), a mechanical department product, and the heat and material balance (HMB) sheet, a process engineering department product. The PFD is simply a mechanical drawing that shows the major equipment items and their associated piping interconnections. The HMB takes the PFD and layers on the "physics" of the system. The HMB provides detail on the amount of heating or cooling that is needed, the flow rates, the dwell times, and the throughput. From these the P&ID is developed.
The "owner" of the P&ID is usually the process engineer or whoever is serving in that capacity. This individual, or group, coordinates the information that is being placed on the drawing to make sure it is consistent with its intent. A coordinator is needed since information flows to this document from many separate sources. Following is a listing of some of the different engineering disciplines that provide input to the P&ID production effort and the type of information provided:
Process engineering: drawing content, process data, vendor equipment depiction
Mechanical: pipe ID numbers, equipment numbers and labels, graphical depiction of equipment and piping
Instrumentation: instrument numbers, graphical presentation of instruments and instrument wiring/tubing
Controls/systems: control logic depiction
Electrical: motor ratings, motor...
