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Join Date: Sep 2009
Location: Coachella, CA
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Looking For A P&ID Standard With Industry Standardized Symbols

02/23/2012 12:03 PM

I have been looking for a P&ID Standard with industry standardized symbols to use in process flow drawing on my plant, which is located in Southern California.
Initially I was pointed to ANSI/ISA 5.1-2009 as it is referenced by Autodesk as being used in its standard symbols. Upon receipt of the standard, I realized it covered only symbols for instrumentation, which is not what I wanted.
I have identified others - ISO-10628-1997, ISO 14617-*:2005, ISO/DIS 10628-1 and ISO/DIS 10628-2, but I have not been able to preview the symbols to see if the standards cover what I am looking for.
If anyone can point me to a standard covering P&ID process flow drawing symbols, I would be greatly appreciative, even more so if I could preview the symbols before buying the standard.

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Pathfinder Tags: drawing symbol P&ID process flow Standard
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#1

Re: Looking For A P&ID Standard With Industry Standardized Symbols

02/23/2012 12:39 PM

What is missing from ANSI/ISA 5.1 that you require? This Standard contains everything I have ever seen on a Piping and Instrumentation Drawing (P&ID), and many...many more.

If you have some specialized equipment or components, you may need to develop symbols for them yourself. This is not uncommon as many companies have their own set of drawing symbols and conventions. This is especially true if they do a lot of In -House design work

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#2
In reply to #1

Re: Looking For A P&ID Standard With Industry Standardized Symbols

02/23/2012 1:01 PM

I found that the ANSI/ISA 5.1 specification symbols are the instrumentation symbols. I need the symbols for the actual mechanical process equipment.

We use AutoCAD for our 2D layouts, and it has symbols, but rather than using legends which eat up valuable drawing real estate, I would rather call out the standard the symbols are based from. Unfortunately, Autodesk hasn't been very forthcoming with where their symbols originated. The only standard they specified was ANSI/ISA 5.1.

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#3
In reply to #2

Re: Looking For A P&ID Standard With Industry Standardized Symbols

02/23/2012 2:06 PM

Why not make a "Standard" drawing with all the symbols that you use. Put all the symbols from Auto-CAD on it that you use plus the ones you create for your non-standard equipment/components. Reference this dwg. on all of you P&ID's, e.g. For symbols used on this dwg. Ref. XXX-XX. That should free up drawing space and provide the standard symbols you need.

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#4

Re: Looking For A P&ID Standard With Industry Standardized Symbols

02/23/2012 4:00 PM

40 years later and the discussion continues! (I'm assuming you're in the chemical/refining realm.) I once had a flow-sheet pencil template, and it didn't draw all the symbols the way my company did.

As far as I know, there is no industry-standard (API, AIChE or ASME) recommended practice for what you're looking for. So much process equipment is custom built (pressure vessels, for example). It took ISA years to get where they are.

I would try to get a look at ISO 14617. I don't have access to the standards but, referring to Wikipedia, ISO 10628 seems to relate to Process Flow Diagrams and ISO 14617 to P&I Diagrams. 14617 has several sections, including several relating to instrumentation which probably conflict with ISA 5.

Regardless, I recommend you maintain a separate legend sheet, instead of referring to standards directly. (I hope if you purchase a copy of the standard, you have the right to incorporate the symbols into your legend drawing.) You also need to incorporate your line numbering, size, spec, insulation, equipment numbering, etc. into the legend. If you don't have a legend, when the standards change, all your P&ID drawings may have conflicts.

By the way, if you have distillation towers/columns, do you number the trays starting from the top or the bottom? Everybody in the company? All your suppliers?

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#6
In reply to #4

Re: Looking For A P&ID Standard With Industry Standardized Symbols

02/24/2012 2:25 AM

When using standards it is always good practice to call out the full specification number including revisioning number (i.e., ANSI/ISA 5.1-2009 instead of ANSI/ISA 5.1). This way if any item on your drawing is affected by a specication change, the drawing interpretation is not changed. If you wish to adhere to the new specification, you need only update the revision portion. I've used specifications for numerous applications and those specifications were updated over the lifetime of the drawing. This time I need a specification I am having difficulty finding. I have some specifications that I believe cover my application but I still need verification before I purchase any more.

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#5

Re: Looking For A P&ID Standard With Industry Standardized Symbols

02/24/2012 2:02 AM

I'm not in the P&ID industry but you mention the mechanical symbols for the processes, have you tried checking the mechanical standards for the symbols you require? There are several standardised elements for pumps and flow control including metering symbols.

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#7

Re: Looking For A P&ID Standard With Industry Standardized Symbols

02/24/2012 8:15 AM

ANSI/ISA 5.1 Instrumentation Symbols and Identification is very important source for instrumentation symbols used at P&ID drawings.

● And for any oil & gas project, the 1st step of design is preparing a separate drawings as a legend sheets, instead of referring to standards directly to avoid any conflicts. These drawings shall include symbols of equipment (mechanical, electrical, process, instruments, … etc.), abbreviations, flow diagrams symbols legend, fluid symbols, piping components symbols, valve coding and symbols, line numbering system, instrument function and symbols, … etc.

● For equipment, there are a lot of handbooks includes its symbols and legend.

.......................................

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