• Line sizing optimization under various flow conditions
• Line specification (pipe class, pressure rating, material of construction, insulation) and specification break
• Design temperature and design pressure
• Defining process controls, trips/interlocks, and safety instrumented functions
• Defining pressure safety valves (PSVs)
• Isolation, vent/drain and sparing philosophies
• Examples of P&IDs for common systems
• P&ID check list