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Piping and Instrument Diagrams

Piping and Instrument Diagrams. CM4120 Chemical Plant Operations. A P&ID is: Language of Symbols Schematic of Process Displays Relative Orientation/Configuration Communication Tool Graphical Table of Contents. A P&ID is not: Piping Isometric Equipment Fabrication Diagram Scale Drawing

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Piping and Instrument Diagrams

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  1. Piping and Instrument Diagrams CM4120 Chemical Plant Operations

  2. A P&ID is: Language of Symbols Schematic of Process Displays Relative Orientation/Configuration Communication Tool Graphical Table of Contents A P&ID is not: Piping Isometric Equipment Fabrication Diagram Scale Drawing Control Logic Diagram Something to Convey Process Information!

  3. Line Designator - First Letter • W - Water or Heat Transfer Fluid • L - Process Fluid • G – Gas (not a process fluid) • V - Vent or Vacuum • S - Steam • C - Condensate

  4. Line Designator - Pipe Size • Following line number is the line size • Given in inches

  5. Line Designator - Pipe Spec. • A – 316 SS tubing w/.038” wall • C - 316 SS pipe Schedule 40 • D - Carbon Steel Sched. 40 (steam) Sched. 80 (Syltherm) • H - Copper Tubing

  6. Equipment Symbols

  7. Equipment Symbols

  8. Equipment Designations • D - Distillation Tower • E - Heat Exchanger • F - Filter • M - Misc. Equipment • P - Pump • R - Reactor • T - Tank

  9. Manual Valve Symbols

  10. Control Valve Symbols

  11. Valve Failure Positions

  12. Instrument Symbols

  13. Control Symbols

  14. ISA Instrument Identification • Transmitters/sensing elements: • FT – flow transmitter • LE – level element • Indicators: • AI – analytical indicator • LI – level indicator • PAH – pressure alarm high • Controllers: • TIC – temp indicating controller • FFIC – ratio flow controller • Controlled devices: • FY – flow transducer • LV – level valve ISA – The Instrumentation, Systems, and Automation Society

  15. References Riggs, Chemical Process Control, Appendix A The Engineering Tool Box, http://www.engineeringtoolbox.com/p&id-piping-instrumentation-diagram-d_466.html

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