Let's say you have a unique piece of equipment—a "Magnetic Flow Meter." The default Plant 3D library doesn't have a good symbol for it. You need to create a custom SKEY, e.g., MAG .
In the world of plant design and piping engineering, the Isometric Drawing (ISO) is the deliverable that matters most to fabricators and fitters. It is the bridge between a 3D model and the physical pipe spool. Within AutoCAD Plant 3D, the generation of these isometric drawings is highly automated, but the true power to customize them lies hidden in a seemingly cryptic code: the (Symbol Key).
Scroll to the section containing the valve listings.
Understanding AutoCAD Plant 3D Isometric Symbols and SKEYs In AutoCAD Plant 3D, isometric drawing generation is a critical deliverable for piping designers and engineers. The system automates this process using a 2D drafting engine that translates 3D pipeline models into standard 2D isometric layouts. At the heart of this translation process is the relationship between the and the SKEY (Symbol Key) .
: A component appears on your isometric sheet as a simple, un-styled 3D-looking rectangle or box. autocad plant 3d iso symbol skey
Open IsoSymbolStyles.dwg from your project's Isometric folder.
Draw your custom symbol using standard AutoCAD lines and arcs.
ISO symbols are standardized graphical representations of equipment, valves, and other components used in process plants. These symbols are used to create a common language for plant designers, engineers, and operators to communicate and understand the design and layout of a plant. ISO symbols are essential in plant design as they help to:
: Open the IsoSkeyAcadBlockMap.xml file with a text editor (like Notepad++) or an XML editor. Add a new mapping line that creates the link, such as <SkeyMap SKEY="FLSC" AcadBlock="MyScrewedFlange" /> . This entry tells Plant 3D that whenever it finds a component with the "FLSC" SKEY, it should use the "MyScrewedFlange" block you just created. Let's say you have a unique piece of
<SymbolDef Inherit="GAV"> <Skey>GAV_300LB</Skey> <BlockName>Gate Valve 300</BlockName> </SymbolDef>
Find the section corresponding to your component type (e.g., ).
[VALVE_SYMBOL] Shape= CIRCLE Diameter= 20 FillColor= RED Label= "VALVE" LabelFont= Arial LabelSize= 12
Every component in a piping system requires an SKEY to enable isometric creation. Without a valid SKEY, the isometric engine may fail to generate the drawing or split it into multiple, disconnected pages. It is the bridge between a 3D model
The isometric engine cannot find the SKEY listed in the spec, or the SKEY is not mapped to a valid block in IsoSkeyMap.xml .
Even experienced users hit these walls weekly.
Navigate to Project Manager -> Isometric DWG Settings -> General Settings -> Symbol Setup. Click .