• Interconnection of main process units and piping
• Piping details and connections associated with operation & maintenance
• Design features of equipment
• Associated instrumentation and logic for control and safeguarding
• Utility, flare and drain connections
• Details related to construction and maintenance
  e.g. notes to provide high point vents/drains, provision of warehouse spare

HINTS

• Break processes into logical parts
  e.g. production, compression, fuel gas, compressed air etc
• General Notes which are applicable to all P&IDs can be shown on separate sheet