Pipe and Instrumentation Diagram (P&ID)

There should be a drawing interpreting the symbols as part of the drawing pack, just to cater for occasions like the one posted.

"Ban abbreviations ASAP!"

Hi there,

As PW said - there should be a "Lead sheet" for your P&ID's. This is usually the sheet after the index.

Usually (not all cases) the line number is made up like such.

xx-yyy-zzz-aa-bb

Where:

xx - process medium abbreviation e.g. PW - Process water

yyy - Plant area number e.g. 613

zzz - Unique pipe number

aa - Line size (might be nominal bore)

bb - Pipe material e.g. MS - Mild steel.

Put it all toegther - PW-613-001-40-MS

Regards,

Craig

I thank you gays for your comments on the P&ID issue for futher clearification there was number thus: PL-C1R-1003; PL-A1-1104. I belive this will throw more light on the question.

Thank you

Some of those are instrumentation symbols, others are likely to be something else.

Have a look at the following for a good explanation:

http://lamspeople.epfl.ch/kirrmann/Slides/HowToReadP&ID.htm

In brief:

KAQ - time-alarm-integration (integration over time, in this case)

Means 'something integrated (integral of something) over time time is too long or short', adding an H to the end would mean that the integrated value is too high (past an alarm point), adding L means that it's too low.

KAH - time-alarm-high

Means 'time measured is too long', something has taken too much time.

CIR - (user's choice)-indicator-recorder

'C' is often used to mean 'conductivity'. Whatever the C means here, the instruments measures cariable-type C, indicates it (it has a display mounted on it, or if it's on an operator screen, the measured value is displayed there), and the measured value is recorded in a data historian.

Most likely, this 'instrument' is a recording indicator on an operator screen. The instrument that measures C would then be CT (C-transmitter) or CIT (C-indicator-transmitter).

Cheers!
MZ