Tagging valves and instrumentation in a RO/DI water process

[454Casull]

We need to identify all the valves and instruments in the process, both at the physical locations and on the P&IDs. Does anybody have any general suggestions for this? What would a suitable numbering system be?

Also, on these slides:

http://www.lle.rochester.edu/pub/documents/ext/P&ID.pdf

they show various instruments around one device using the same number (slide 5). Is this best practice?

 

[FrancisL]

Yes, tagging around equipment items can be good.
I wrote a blog on this topic, See

http://controldraw.blogspot.com/2009/10/tag-naming-p-and-in-controldraw.html

Francis

Francis

http://www.controldraw.co.uk

http://www.s88control.blogspot.com

 

[sheiko]

In addition to the letters, each device within an loop carry the same number - the loop number.

Instrument numbers may be structured to identify the lop location.
A good approach is to tie the PID number to a particular area (physical location), and then to sequentially number the instruments on that PID. For example, PID 25 carries up to 100 loops, or instrument loop numbers 2500 to 2599.

"We don't believe things because they are true, things are true because we believe them."

 

[FrancisL]

One point that shieko's system does not address is that it is good to use the same instrument number (or that part not from the Area/P&ID) for similar instrument functions, for example so every similar vessel has the same numbers for inlet valves, outlet valves, level tx etc. Again this is mentioned on the blog I refered to.


Francis

http://www.controldraw.co.uk

http://www.s88control.blogspot.com