Loop diagrams are not a new concept. ISA standard ISA-5.4-1991, Instrument Loop Diagrams, covers a general version focused on instrumentation I/O wiring. Commonly known as ISA-5.4, the ISA loop ...

Ascertain how widespread is the use of instrument loop diagrams, and determine the degree of uniformity in symbology, semantics, and presentation among those loop diagrams. Establish whether ...