Valve types and selection

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Valve types and selection

  1. 1. P&ID SYMBOLSISA Symbols and Loop Diagrams
  2. 2. P&IDsPiping and Instrumentation Diagrams or simply P&IDs are the “schematics”used in the field of instrumentation and control (Automation)The P&ID is used to by field techs, engineers, and operators to betterunderstand the process and how the instrumentation is inter connected.Most industries have standardized the symbols according to theISA Standard S5.1 Instrumentation Symbol Specification. • Piping & Instrumentation Drawing (original) • Process & Instrumentation Diagram (also used) • Process Flow Diagram – PFD (simplified version of the P&ID)
  3. 3. Temperature ProcessUsing pictorial diagrams may be informative however it is not practical or CAD friendly especially in a multi-loop process. Temperature Controller and Recorder Temperature Transmitter Steam Pneumatic Control Valve Heat Exchanger
  4. 4. Building the P&IDThe P&ID will use symbols and circles to represent each instrument and how they are inter-connected in the process. Temperature Controller and Recorder Temperature Transmitter Thermometer Temperature Sensing Bulb Pneumatic Control Valve
  5. 5. Tag NumbersTag “numbers” are letters and numbers placed within or near the instrument to identify the type and function of the device. TRC 206 TT 206 TI 206 Temperature Sensing Bulb FCV 206
  6. 6. Tag Descriptors The succeeding letter(s) areThe first letter is used to designate used to designate the functionthe measured variable of the component, or to modify the meaning of the first letter. X Y Z 123 Pressure Indicator Level Recorder Flow Controller Temperature Transmitter
  7. 7. Tag NumbersTag “numbers” are letters and numbers placed within or near the instrument to identify the type and function of the device. Temperature Recording Controller TRC 206 Temperature Transmitter TT 206 TI 206 Temperature Indicator Temperature Sensing Bulb FCV 206
  8. 8. ISA S5.1 Identification Letters
  9. 9. Examples
  10. 10. Instrument LocationThe presence or absence of a line determines the location of the physical device. For example no line means the instrument is installed in the field near the process. X Y Z X Y Z X Y Z 123 123 123 No Line Solid Line No Line The instrument is The instrument is The instrument is mounted in the field mounted in the mounted out of sight near the process, control room (not accessible to the (close to the operator) (accessible to the operator) operator)
  11. 11. Shared Displays/Shared ControlSome instruments are part of a Distributed Control System (DCS) where a specific controller or indicator can be selected from many others but shown in one location (like a terminal screen) In the control room In the plant Not accessible
  12. 12. Summary of instrument type & location
  13. 13. Piping and Connection Symbols These symbols are used to identify how the instruments in the process connect to each other. And what type of signal is being used. (electrical, pneumatic, data, etc)
  14. 14. Valve Symbols
  15. 15. P&ID Example Temperature Controller and Recorder TRC 206 Temperature Transmitter TT 206 TCV S TI 206 206Steam Pneumatic Control Valve Heat Exchanger
  16. 16. P&ID Exercise FIC TIC1 YIC2 TY 3 FT TT 1 2 3
  17. 17. P&ID Exercise FIC – Flow Indicating Controller TIC Temperature Indicating Cont. YIC PLC Indicating Controller TY Temperature Computer Output FT Flow Transmitter TT Temperature Transmitter
  18. 18. Process Flow Diagram - PFDA PFD shows less detail than a P&ID and is used only to understand how the process works

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