Part data basis is a way to describe the different dimensions and graphics for a part. A gate valve, for example, can come in many different forms, with varying body shapes and types of bonnets.
In the Smart Reference Data software, a symbol .dll file constructs the geometry of the part based on a set of dimensions. The symbol.dll uses, or implements, the part data basis to create all the different gate valves. Part data basis is a codelisted attribute.
The symbol .dll for the gate valve is named SP3DGateValve.dll. It supports close to 30 types (type meaning part data basis) of gate valves. For example, it supports PDB = 2232, which is a gate valve based on the face to face dimension and offset from the valve centerline. See the gate valve graphic below.
The same symbol .dll file also supports PDB = 2256, which is a gate valve based on the face to face dimension, offset from the valve centerline, and diameter. Note that this symbol is quite different from the one above.
The part data basis concept applies to piping, HVAC, cabletray, and conduit symbols.
You can link a symbol code in the Symbol Codes grid to part data basis (PDB) information.
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When the document management and part data basis features are used on a client machine for the first time, the logged in user running Smart Reference Data Plus must have administrative privileges.
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If you are trying to use symbol manager for the first time, you must have write permissions to the, C:\ProgramData\Intergraph\SPRDPlus folder (This file may be hidden. Please unhide and try again).
Seq - Provides a sequence number for the rows in the grid. The initial value for this field is 1. The maximum for this field is 9999999.
Data Seq - Use the Selection list 
to select sheet data from a Smart 3D template. First, the software checks the project
default ZI_SP3D_CT for the template. If no value is set, the software then checks the project default
ZI_SP3D_TP.
The Selection list only shows values for the sheet type PartDataBasis and category CODE_LIST on SP3D 10.08 Templates.
The attached sheet configuration attributes for the PartDataBasis sheet are shown in the rest of the grid. These columns are read-only.
Seq - Provides a sequence number for the rows in the grid. The initial value for this field is 1. The maximum for this field is 9999999.
Comment - Type any text here.
File Type - Use the Selection list to select a file.
File Name - When you select a file, this field is automatically populated.
User File Name - You can type a different name for the file in this field.
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