# Process Diagram Symbols

**URL:** <https://forumautomation.com/t/process-diagram-symbols/663>\
**Category:** Field Instrumentation\
**Created:** [December 13, 2015, 6:59am UTC](https://forumautomation.com/t/process-diagram-symbols/663 "2015-12-13T06:59:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![denizen](https://forumautomation.com/letter_avatar_proxy/v4/letter/d/848f3c/32.png) [@denizen](https://forumautomation.com/u/denizen)\
**Post date:** [December 13, 2015, 6:59am UTC](https://forumautomation.com/t/process-diagram-symbols/663/1 "2015-12-13T06:59:46Z")

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Types of Process Diagrams

1. **Process Flow Diagram**

A flow diagram is a simple illustration that uses process symbols to describe the primary flow path through a unit

2. **Process and Instrument drawing**

A process and instrument drawing is more complex. The P&ID includes a graphic representation of the equipment, piping, and instrumentation

**Process and Instrument Symbols**

Basic instrument Symbol

![Process and Instrument Symbols](https://cdn.forumautomation.com/original/1X/0447b65ebd68d10a5d8ca727fc49c0ecc1a83f83.jpg)

![basic instrument symbols](https://cdn.forumautomation.com/original/1X/332fc5c5064dfec26d934a193049011d1d331e8d.jpg)

**Example of Process Flow Diagram**

 ![Process Flow Diagram](https://cdn.forumautomation.com/original/1X/0ecd383997e003a7f52427128eaa6343ea2d1c8f.jpg)

**Example of Process and Instrument Diagram (P&ID)**

 ![Process and Instrument Diagram](https://cdn.forumautomation.com/original/1X/0e6e383e1bc0c22abc0a112e333df77b3236e18d.jpg)

**Process Legend**

 ![Process Legend](https://cdn.forumautomation.com/original/1X/8f6cf34c70bb132b7a9951e9eefe54cc17d613f8.jpg)

**Electrical Drawing**

 ![electrical drawing](https://cdn.forumautomation.com/original/1X/3dbcafea2215362acebf9a03fb0a724e878501c0.jpg)

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<div class="post-metadata">

**Author:** ![denizen](https://forumautomation.com/letter_avatar_proxy/v4/letter/d/848f3c/32.png) [@denizen](https://forumautomation.com/u/denizen)\
**Post date:** [December 13, 2015, 7:12am UTC](https://forumautomation.com/t/process-diagram-symbols/663/2 "2015-12-13T07:12:59Z")

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**Piping Symbols**

![Piping Symbols](https://cdn.forumautomation.com/original/1X/1fec51e0637ddee4c6756ca1b2026d0425ad6739.jpg)

**Valves**

![Valves](https://cdn.forumautomation.com/original/1X/16a0432eb324945140a4f6a3125ca9b6bb4006ef.jpg)

**Pumps and Tanks**

![Pumps and tanks](https://cdn.forumautomation.com/original/1X/803634e6c5ab852a8e155df05c482926ac51b745.jpg)

**Compressors, Steam Turbines, and Motors**

![Compressors, Steam Turbines, and Motors](https://cdn.forumautomation.com/original/1X/7ddb7fb28eaa00e1a36815853a33beed2c175699.jpg)

**Heat Exchangers**

![Heat Exchangers](https://cdn.forumautomation.com/original/1X/fce4b03d3d18fda4c6fb4bdf6f4273f8353888fe.jpg)

**Cooling Towers**

![Cooling Towers](https://cdn.forumautomation.com/original/1X/d565f401e8909f5d5b5eed24eb1ba5f2139c4e19.jpg)

**Reactor Symbols**

![Reactor Symbols](https://cdn.forumautomation.com/original/1X/d2738a286355d402c28df478c90c5421fa9159f1.jpg)