Sample P&ID Creation for Training

I'm in need of pre-made Piping and Instrumentation Diagrams (P&IDs) for training purposes. These diagrams should not be used for any commercial projects.

Key Requirements:

- Sample P&ID drawings in AutoCAD, PDF, or Visio
- Must include:
- Piping layout
- Equipment
- Valves
- Pumps
- Instruments
- Control loops
- Preferably from oil & gas, chemical plants, water treatment, or manufacturing industries
- Clear labeling of all symbols and components
- At least 4 to 5 different examples (simple to medium complexity)

Optional but Preferable:

- Corresponding PFD (Process Flow Diagram)
- A legend/symbol sheet for training reference
- Editable source file (DWG/DXF/Visio)

Intended Usage: Diagrams will be used solely for practice, training, and teaching purposes.