READING P & IDs MADE EASY: All you will ever need to easily read and interpret P & IDs in one clear and concise book, makes your life in the Process Industries ... incredibly easy, by Brad Smith & Brad Smith

Author:Brad Smith & Brad Smith [Smith, Brad]
Language: eng
Format: azw3
Publisher: North American Training Systems Inc
Published: 2017-07-03T16:00:00+00:00

This time for the above instrument symbol, just move down to the symbols on the second row of Table 4.2 above. It is the ones that show a circle inside of a square. These are used to represent a graphic on a computer screen or control panel that you can see and possibly interface with via touch panel or a computer mouse. It might be used to show the level in a tank (as the Tag Number in the bubble shown here suggests) or represent a Hand Switch that you could click on with the mouse to start a pump (or a thousand other things!). The point is if you can see it on a control screen (most likely in the Control Room), it will be represented as a circle inside a square on P & IDs. Don’t ask me who decided this, all I know is that it wasn’t me!

The last two rows are for symbols that let the reader know a computer is used to do some sort of complex processing. The hexagon means a “computer is used.

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