document: A PID standard : What , why , how ? The paper is written for all who develop and use P&ID s . It will aid in solving the long existing and continuing problem of confusing information on P&ID s . 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
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