Free AutoCAD P&ID equipment and piping symbols (DWG), ISO 10628-2 style

About ISO 10628-2

ISO 10628-2 specifies the graphical symbols for chemical and petrochemical process flow diagrams and P&IDs, such as vessels, columns, heat exchangers, machines and fittings. Instrument symbols are not part of it; they follow ISA 5.1 (see the instrumentation library).

These symbols are our own drawings after the symbol groups of the standard. They are not copied from it, and the library is not certified against it. Company and project standards often draw some symbols differently; change the blocks if yours do.

Frequently asked questions

Are these symbols ISO 10628-2 compliant?

They are drawn after the common forms of the ISO 10628-2 symbol groups, but were not checked clause by clause and are not certified. If a client requires strict conformance, compare the shapes with your copy of the standard.

Does the library include instrument and control symbols?

No. Instrument bubbles, control valves with actuators and signal lines are in the separate ISA 5.1 library. The valve bodies in this library are the process valve symbols of ISO 10628-2.

Can I use the symbols in commercial projects?

Yes. They are free to use and modify in your own projects, including commercial ones. They are provided as is, without warranty.

How do I make an equipment list from the drawings?

Export the blocks of all drawings to Excel with BlockSync, which gives one row per block with its tag and attributes. Fill in the missing data in Excel and write it back in one run, with preview and backup.

Can I change a symbol or add attributes?

Yes. Open the DWG, edit a block with BEDIT to change it or add attributes, and save. To update drawings that already contain the block, run ATTSYNC or replace the block. Make a backup first: attribute values can be lost if ATTSYNC is used carelessly.

Where do I find a ready-made set of these symbols for AutoCAD?

AutoCAD itself ships only a small set of sample blocks, so a full symbol set has to come from a library. Download the ZIP on this page and open the DWG: every symbol is a block. Insert one with INSERT (Blocks palette, Libraries tab, then pick the DWG) or drag it from DesignCenter (ADCENTER). You can also download a single symbol on its own.