Process equipment instruments and controls

Process control systems and instrumentation can be described in several ways. Flowsheets show the process equipment, instruments, and control systems, as well as interconnections, such as piping and electrical and pneumatic transmission lines. More detailed flowsheets are referred to as piping and instrumentation diagrams (P IDs), They include additional information, such as valve characteristics, piping details (e.g., pipe sizes and fittings), and miscellaneous information, such as drains, vents, and samphng fines. Both types of diagrams are widely used in the process industries. 

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