Piping and instrument diagrams
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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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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

Control Logic Diagram

Something to Convey Process Information!


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


Line Designator - Pipe Size

  • Following line number

    is the line size

  • Given in inches


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


Equipment Symbols


Equipment Symbols


Equipment Designations

  • D - Distillation Tower

  • E - Heat Exchanger

  • F - Filter

  • M - Misc. Equipment

  • P - Pump

  • R - Reactor

  • T - Tank


Manual Valve Symbols


Control Valve Symbols


Valve Failure Positions


Instrument Symbols


Control Symbols


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


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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