Water Treatment Plant P&ID

I am busy getting myself proficient on AutoCAD Plant 3D and are looking for an old piping and instrumentation diagram (P&ID) of a treatment plant, any type of plant.  Want to use it to recreate it as an intelligent P&ID and then use that to create a linked 3D model of the piping and equipment.  Want something real so it does not look ridiculous on paper. Preferably something in metric standards, not imperial..... Can anyone help with this please?