Looking for a set of process and instrumentation diagram (P&ID) linetypes? Look no further. This tip contains a PDF document of linetypes, including LIN, SHP, and compiled SHX files. The LIN and SHX files must be in a folder that is searchable by AutoCAD. To use these linetypes, define a new text style named LType. Next use the Linetype Command to load the PID.LIN contents and select the linetype you want to use. Note that without the LType text style some of the linetypes cannot be loaded. As an alternative, you can rename the LType entries in the LIN file to Standard. Linetype Library makes a nice addition to your library.