Even if it's not apparent, the major equipment is always tagged and named with some general specifications provided along one edge of the drawing.It is almost always self-evident what a symbol represents for major equipment, and.However, I have generally stopped using them in my group because It's good to have lead sheets for that kind of stuff I'm not going to say otherwise. Related to the content I include on the example lead sheets, you might have noticed a conspicuous absence of lead sheets for major equipment, i.e., tanks, pumps, and sundry items typically included in process plants, etc. And the two I present here should be up-front-and-center in your set. Poorly organized and/or incomplete lead sheets will just frustrate folks who turn to them for help so it's important to keep them neat, concise and logical. What is important is that they are logically organized so that the symbols and tags can be located easily.

Probably even a few with six or seven just to prove a point I suppose, but the number of lead sheets isn't important. Yeah, I realize some companies have more than two lead sheets, four or five even.

Seriously, the significant digits are right here, I checked them. Here's the good news - these lead sheets include 90.00?0.05% of what you need to know. The lead sheets I provide in the supporting file download to this series include the following Having seen a number of lead sheets over the years, I can tell you that most of them are just variations on a core set of generally accepted symbols and notations that engineers and industry organizations have settled on as defacto standards over the years. Every company that builds process plants should have a set of lead sheets customized to their particular ways and means. These are your 'secret decoder rings' to P&ID symbology interpretation. Lead Sheets Define SymbologyĪs I mentioned in Part 2, the meanings of the various symbols used on P&IDs (aka, symbology) are defined on separate drawings called 'Lead Sheets' (or Legend Sheets). If you think I short-changed any areas and would like more detail on any topic, please let me know via the comment system. I might even be pushing the limits of 's server capacity but I did my best to balance breadth of content with depth of detail. However, I'm going to warn you up front - this is a big part in the series, figuratively and literally speaking. That's the goal I had when I started this series and by golly, I'm sticking to it. With the requisite academics out of the way, it's time to focus on the exciting stuff - P&ID symbology interpretation.

Isometric plumbing diagram