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

Piping and Instrument Diagrams

CM4120

Chemical Plant Operations


Piping and instrument diagrams

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

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

Line Designator - Pipe Size

  • Following line number

    is the line size

  • Given in inches


Line designator pipe spec

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 symbols1

Equipment Symbols


Equipment designations

Equipment Designations

  • D - Distillation Tower

  • E - Heat Exchanger

  • F - Filter

  • M - Misc. Equipment

  • P - Pump

  • R - Reactor

  • T - Tank


Manual valve symbols

Manual Valve Symbols


Control valve symbols

Control Valve Symbols


Valve failure positions

Valve Failure Positions


Instrument symbols

Instrument Symbols


Control symbols

Control Symbols


Isa instrument identification

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

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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