Читать книгу Automation of Water Resource Recovery Facilities - Water Environment Federation - Страница 76

Process and instrument diagrams typically are the most important design documents for a control system because they define the process, physical facilities, interconnections between units, measurement types and points, control elements, and control loops. These documents reflect the consensus of the designer and owner, and help design teams coordinate their efforts.

A typical wastewater project requires between 40 and 50 P&IDs, all of which meet the International Society of Automation (ISA) S5.1, S5.3, S5.4, and S5.5 standards. Smaller facility upgrades or retrofit projects require fewer drawings depending on the extent of process modifications mandated by the project. The documents are typically printed on 28-cm by 43-cm (11-in. by 17-in.) or 56-cm by 86-cm (22-in. by 34-in.) or larger sheets of paper so the lettering is easy to read (see Chapter 4 for more details).