title: A PID standard: What, why, how?
abstract: The paper is written for all who develop and use P&IDs. It will aid in solving the long existing and continuing problem of confusing information on P&IDs. The acronym P&ID is widely understood to mean the principal document used to define the details of how a process works and how it is controlled. The ISA Dictionary definition for P&ID tells what they do, "show the interconnection of process equipment and the instrumentation used to control the process. In the process industry a standard set of symbols is used to prepare drawings of processes. The instrument symbols used in these drawings are generally based on ISA-S5.1." In the paper the ISA standard is referred to as ISA-5.1. The article develops the concept of the "standard" and poses some of the questions that the "standard" can answer
keyphrases: principal document ISA standard ISA-5.1 P&ID standard process controlled