ISO 15519-2, “Specifications for diagrams for process industry – Part 2: Measurement and control,” has just been released. This new standard complements ISO 15519-1 on general rules for these diagrams. It covers how to prepare different types of diagrams including the use of graphical symbols, letter codes and reference designations.
What kinds of industries should use ISO 15519-2? This standard has been written for all types of process industry fields. Some examples of this would be the chemical, petrochemical, power, pharmaceutical, food, pulp and paper industries.
What kinds of diagrams are included in this ISO standard? You’ll find information on the representation of measurement, actuation and control for process diagrams that include process flow diagrams (PFD), process and instrument diagrams (PID), process control diagrams (PCD) and typical diagrams (TYD).
Does this standard apply to the software that I use to generate process diagrams? Indeed it does. The ISO 15519-2 covers both the principles of process diagramming as well as the symbols used and their meanings. It also reviews the interrelationship between ISO diagrams and IEC diagrams, since process diagrams contain elements of both schema. So it can be used to understand the criteria by which a rules based system using a defined set of symbols should be implemented.
How is the ISO 15519-2 organized? It starts with the usual scope, referenced documents and definitions sections. Next it covers documentation and process control principles and how to exchange process control information. Section 6 is centered on representation in general. Then Section 7 specifically reviews representation in diagrams. In this section, there’s an introduction and then each of the 4 types of diagrams I mentioned above are discussed. The standard is completed by 5 Informative Annexes and a 14-item Bibliography. Topics covered in the Annexes include a list of graphical symbols, examples of how to represent meanurement, control, and actuation tasks, diagram examples, the information exchange between process and control equipment, and the relationship between terms for closed loop control, measurement, actuation and so on.
By the way, the standard contains a note from the committee that it plans to withdraw all parts of the ISO 3511 series. FYI: The graphical symbols have already been moved over to the ISO 14617 series of standards. Diagram rules are of course now in this ISO 15519 series. Letter codes for process variables and control functions are also moving, this time from the ISO 14617 series to this ISO 15519 series.
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