|Process and Instrument Drawings
A P&ID is a complex representation of the various units
found in a plant . It is used by people in a variety of
crafts. The primary users of the document after plant startup
are process technicians and instrument and electrical, mechanical,
safety, and engineering personnel.
In order to read a P&ID, the technician needs an understanding
of the equipment, instrumentation, and technology. The next
step in using a P&ID is to memorize your plant’s
process symbol list. This information can be found on the
process legend. Process and instrument drawings have a variety
of elements, including flow diagrams, equipment locations,
elevation plans, electrical layouts, loop diagrams, title
blocks and legends, and foundation drawings. The entire
P&ID provides a three-dimensional look at the various
operating units in a plant.