Hi Richard
I have always labelled hand valves on P&IDs, but not on generalised
scematics used for preliminary and educational work.
My understanding of a P&ID is that it should identify all major componentry
with an identifier so more detailed information can be referenced. You can
get around this by adding notes to the P&IDs as to where the relevant
information on hand valves is located, but it is tacky. The one possible
exception to this is when the selection of valve size and type will be made
in the field. But even then they should be added to the as-builts (remember
them?)
Your Engineering dept needs a rev up if their method of error reduction
results in an increase in the likelihood of errors by others. And not
identifying valves on a P&ID falls into this category
Cheers
Steve
>From: "flowr_8" <r_beale@shaw.ca>
>Reply-To: PipingDesign@yahoogroups.com
>To: PipingDesign@yahoogroups.com
>Subject: [PipingDesign] Valve identification on P&IDs
>Date: Fri, 19 Jan 2007 17:19:10 -0000
>
>Hi all,
>I'm just doing a small inquiry. We have had discussions at work on
>the value of putting valve tags on the P&IDs; the valve
>identification code that is in the piping specifications for hand
>opertated valves. Currently this isn't done. All that shows up on
>the P&ID is the valve symbol, so if it is necessary to know more,
>e.g. trim, handwheel or gear op., etc. you have to go to the piping
>specifications. Our construction group are pushing for it as it will
>make their job easier when they do a final walk through of the
>systems. Engineering are reluctant because of the amount of work and
>the possibility of error. We do produce isometrics from a 3D model
>which has a complete BOM, which includes, of course, the valve tags.
>
>What's your experience? Value added or not?
>
>Richard Beale
>Design Coordinator
>EnCana Oil and Gas Partnership
>Calgary, Alberta
>
>
>
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