LNG Liquefaction and Refrigeration Systems
Understand how refrigeration cycles progressively remove heat from treated natural gas until it becomes LNG, and how compressors, refrigerants and cryogenic heat exchangers interact.
System context
Liquefaction train
Technical topic pages show the knowledge scope behind LNG University learning. Course, assessment and credential availability depends on the applicable program.
Relevant roles
Liquefaction operators · Process engineers · Control-room personnel · Project engineers
Prerequisites
Thermodynamics · LNG properties
Knowledge level
Intermediate technical coverage with system and operational context.
Learning outcomes
What this topic is intended to help you understand
- Describe the purpose of precooling, liquefaction and subcooling.
- Identify the role of refrigerant compressors, condensers, expanders or valves and cryogenic heat exchangers.
- Explain why composition and compressor performance affect train capacity.
Technical scope
Equipment, concepts and terminology
- Refrigeration cycles
- Pure and mixed refrigerants
- Compression and condensation
- Expansion
- Heat-exchanger duty
- Refrigerant inventory
- Train integration
Operating context
How the topic connects to plant operation
- Refrigerant balance awareness
- Compressor loading
- Temperature-profile monitoring
- Feed-rate interactions
Safeguards and controls
Protection and risk-control context
- Compressor protection
- Pressure relief
- Low-temperature materials
- Refrigerant containment
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
- Liquefaction PFD
- Refrigeration P&IDs
- Heat and material balance
- Compressor maps