Piping and Instrumentation Diagrams have been extensively dealt with on this website. However, the best way to be proficient in reading P&IDs is to study a wide array of piping and instrumentation diagrams.
Therefore in this tutorial, I will simply tabulate the instrument abbreviations used in the P&ID below and the symbols used in the diagram:
Symbols Used in the P&ID
The first thing to do with this P&ID is to identify the various instrument symbols used. To help in understanding this P&ID, the various symbols used
in the above instrumentation diagrams and their meaning are indicated in the table below:
in the above instrumentation diagrams and their meaning are indicated in the table below:
Instrument Abbreviations Used in the P&ID
Another key part of the above piping and instrumentation diagram is the instrument abbreviations used in tagging each of the instrument symbol used. The table below illustrates all the instrument symbols used and their various meanings:
| Instrument Abbreviation | Meaning of Abbreviation Used | Function |
|---|---|---|
| FT | Flow Transmitter | Measuring flow and transmitting it to FIC |
| FIC | Flow Indicator and Controller | Receives flow value from FT and controls flow entering process vessel by controlling the opening and closing of the manual valve with actuator |
| SL | Solenoid | Its function is to receive electrical signal and allow the control of the manual valve with actuator through pneumatic signals |
| TT | Temperature Transmitter | It measures temperature and transmit the value electronically to TIC which in turn is used to control a control valve |
| TIC | Temperature Indicator and Controller | Receives measured temperature signal from TT and uses this value to control the control valve |
| WT | Weight Transmitter | Measures the weight of process fluid in the process vessel and transmits its value electronically to WR |
| WR | Weight Recorder | Continuously records the weight of process fluid transmitted to it by WT |
To fully understand how the instrument abbreviations are formed please read:
Instrument Abbreviations Used in P&IDs
Basics of Piping and Instrumentation Diagrams
Common Symbols Used in Developing Instrumentation Diagrams
