Piping & Instrumentation Diagrams (P&IDs)
Develop the ability to read the detailed relationship among process piping, valves, instruments, equipment, control loops and safeguards on LNG P&IDs.
System context
Process, piping and controls
Technical topic pages show the knowledge scope behind LNG University learning. Course, assessment and credential availability depends on the applicable program.
Relevant roles
Operators · Control-room personnel · Instrument technicians · Mechanical technicians · Process engineers
Prerequisites
Process Flow Diagrams · Basic instrumentation
Knowledge level
Intermediate technical coverage with system and operational context.
Learning outcomes
What this topic is intended to help you understand
- Follow a process line from equipment to equipment.
- Interpret common valve, instrument and control-loop symbols.
- Relate a P&ID to field equipment, operating procedures and cause-and-effect logic.
Technical scope
Equipment, concepts and terminology
- Line numbers and specifications
- Manual and actuated valves
- Instrument tags
- Control loops
- Equipment nozzles
- Drains and vents
- Relief connections
- ESD interfaces
- Utility connections
- Tie-ins and boundaries
Operating context
How the topic connects to plant operation
- Line-up verification
- Isolation planning
- Troubleshooting process deviations
- Confirming instrument and valve relationships
Safeguards and controls
Protection and risk-control context
- Controlled-document discipline
- Independent verification for critical isolation
- Recognizing relief and shutdown paths
Technical learning does not replace site procedures, OEM documentation, engineering calculations, permits, supervision or facility-specific authorization.
Engineering documents
Documents commonly connected to this subject
- PFD
- Cause & effect chart
- Loop diagram
- Instrument index
- Valve list
- Line list