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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

Piping and Instrument Diagrams

CM4120

Chemical Plant Operations

slide2
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 designations
Equipment Designations
  • D - Distillation Tower
  • E - Heat Exchanger
  • F - Filter
  • M - Misc. Equipment
  • P - Pump
  • R - Reactor
  • T - Tank
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