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Ideas for line tagging system?

Ideas for line tagging system?

(OP)
I know this has been discussed before, but I want to bring it up again: I would like to hear different people's methods of labeling lines on a set of multiple P&IDs. Right now I have 1"-SS1-001 (line size-pipe material-sequence number), but it gets very messy each time I add or delete a line. So now the lines on a P&ID seem entirely random. I've read about using Equipment From:Equipment To in the tag, but my main issue with that is how do you label a pipe that is connecting between two other pipes, or T's? I would love to hear people's systems that they commonly use.

Thanks!!

RE: Ideas for line tagging system?

IMO, the equipment tags are limited and may be less trouble to be used for the line numbering, if wanted. But, to create a line number with two pipe labels may be very cumbersome, and not worth the effort.

For a multiple operation units plant, the line number is based on the "units" and "process", such as:
1001 -P -0001 -1" -SS1 -PP
(unit#- process index- sequence #- line size- piping class- insulation type)

The four digits of the unit# and sequence# provide a flexibility, which are used to group the pipes in the same unit through the multiple P&IDs. And, it may further be used to separate the lines for each P&ID in that unit.

RE: Ideas for line tagging system?

You might try adapting the wire numbering system used by electricians. Any wire that is electrically continuous to another wire has the same number. If there is a switch (valve) or other component that may interrupt this continuity the number changes. Then add any additional details you need. It is very useful for troubleshooting problems later.

RE: Ideas for line tagging system?

No, I disagree: Electrical controls and electricians very, very rarely use Tee's, parallel pipes and bypasses around filters or control valves or dead-end lines like vents and drains. They run a single, uninterrupted wire from connection (terminal) to terminal - which then does the connecting function like a tee or wye.

RE: Ideas for line tagging system?

Some numbering methods are found here:

http://www.instrumentationtoolbox.com/2011/03/pipi...

http://pipingdesigners.com/contents/tips-tools-t raining/section-2-management-supervision/27-section-2a-introduction-to-line-numbering

http://www.eng-tips.com/viewthread.cfm?qid=206009

Your final selection of a "line tagging scheme" must be in accordance with the desired format of your line lists.

http://www.chemicalprocessing.com/articles/2013/di...


Let us know of your final decision .....

MJCronin
Sr. Process Engineer

RE: Ideas for line tagging system?

(OP)
Thanks for all your replies. I took ideas from each and created my own system for this particular process. 1"-SS1-XXYY, where XX = last two digits of P&ID number from where the pipe originates, and YY = sequence number of pipes that start on that P&ID. So 0105 is the 5th pipe that starts on PID-01. From here I use the last four digits of the pipe number to identify valves and instruments. So V0105-1 is the first valve on line ending in 0105. I think its an intuitive system that is easy to follow. So if we are referring to V1317 we immediately know where that valve is located, as opposed to trying to find V-137 which could be anywhere.

Thanks everyone.

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