Which ISO standards matter for P&IDs?
Two are worth knowing: ISO 10628-2 and ISO 14617-2.
ISO 10628-2:2012 provides graphical symbols specifically for diagrams in the chemical and petrochemical industry.
ISO 14617-2:2025 is a broader graphical symbol library for industrial diagrams of many kinds.
The two are linked: ISO 10628-2 is a collective application standard of the ISO 14617 series. It applies ISO 14617 symbols to process plant diagrams.
What does this mean in practice?
On a P&ID, ISO-based conventions mainly cover physical process components: valves, pumps, vessels and other equipment. Instrumentation may follow another convention, often ISA, depending on the project or company. See also: ISA instrumentation symbols.
What do EN ISO, DIN EN ISO and BS EN ISO mean?
In Europe you will see names like EN ISO, DIN EN ISO and BS EN ISO. These usually indicate European or national adoption of an ISO standard rather than a separate P&ID symbol language. Check the national version and its foreword before assuming they are identical.
See InduDraft's ISO P&ID editor.
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