P&IDs - strip vs. sheet
P&IDs - strip vs. sheet
(OP)
Our company has bought a number of plants. We are trying to standardise on P&IDs. Some plants use the scroll type or strips while others are using sheets. My personal preference is sheets but in order to convince those who have been using strips or scrolls for over 20 years I need some support! Where can I find articles or can anybody give me some good reasons why the one type is better than the other?





RE: P&IDs - strip vs. sheet
I haven't seem any plant designed with them since the early 70s, so I think they've gone the way of the dinosaur, but others may have different knowledge and experience.
RE: P&IDs - strip vs. sheet
saxon
RE: P&IDs - strip vs. sheet
Both saxon & jay165 have hit the nail on the head. The strongest, most logical and forceful reason that you have to eliminate the scroll-type of P&ID is that this type of drawing is not subject to change easily in a timely and cost-effective manner.
If your plant is within the USA, you are subject to OSHA mandates and legal requirements and, as such, must maintain your P&IDs up-to-date (on a day-to-day basis) with every change, addition, or removal of equipment that takes place. This is in keeping with OSHA's PSM policy and follows their dictates on Management Of Change (MOCs - remember them?).
There was a time when the P&ID was an archival document: it was drawn and filed for reference and as a museum piece. This no longer is the case legally. The P&IDs are now regarded as living documents subject to modifications and changes, as per MOC, and must be kept at the ready for review and inspection by OSHA whenever they come a'calling at the front gate.
These legal requirements must be met and you will soon find that you must have the facility to add (& remove) sections or portions of your P&IDs. This is why the Sheet Method is the only way to go, and the "strip" method cannot function properly under such requirements.
If you can't convince your supervisors with the above information, they deserve the opportunity to pay the difference in maintaining the P&IDs.
Art Montemayor
Spring, TX
RE: P&IDs - strip vs. sheet
As we moved into the CAD era we (like many other companies) broke our P&ID's up into sheets, but they were always drawn with the utility "rails" across the top and flags from one sheet to the next so that if you wanted to stick them all together into a scroll you could.
During training and commissioning sessions it is best to have a scroll type to stick up on the wall of the "war-room". But during plant construction and checking scrolls are very difficult to use and sheets are better.
If you plan carefully, you can have both!
regards
Harvey
RE: P&IDs - strip vs. sheet
My own ranting & ravings. ...Mark
RE: P&IDs - strip vs. sheet
P&ID ???
<nbucska@pcperipherals.com>
RE: P&IDs - strip vs. sheet
Class act on your post, btw.
RE: P&IDs - strip vs. sheet
Correction: P&ID = Piping and Instrumentation Diagram.
As I mentioned and inferred previously, it is the official and legal document wherein Electrical Engineers are supposed to show how a process is designed, installed, & operated safely using instrumentation, interlocks and safety relief devices. It is the documented instrument by which an operating process is technically defined and maintained in the As-Built condition in accordance with the USA government’s mandate in OSHA 1910.
Read Thread124-63685 for an in-depth discussion on the subject.
Art Montemayor
Spring, TX
RE: P&IDs - strip vs. sheet
RE: P&IDs - strip vs. sheet
Thanks
SL1000
RE: P&IDs - strip vs. sheet
RE: P&IDs - strip vs. sheet
The sheet type is a standard sheet such as A0, A1, A3 or for those Americans under you 11 x 17" etc.