Boil-Off Gas Management
Understand the sources, collection, compression, recovery and disposition of BOG across storage, unloading, loading and regasification operations.
System context
Storage, transfer and sendout
Technical topic pages show the knowledge scope behind LNG University learning. Course, assessment and credential availability depends on the applicable program.
Relevant roles
Terminal operators · Control-room personnel · Process engineers
Prerequisites
LNG properties · Storage tanks
Knowledge level
Intermediate technical coverage with system and operational context.
Learning outcomes
What this topic is intended to help you understand
- Identify major BOG sources.
- Trace typical BOG routing through headers, compressors and recovery systems.
- Explain how BOG management interacts with tank pressure and terminal operating mode.
Technical scope
Equipment, concepts and terminology
- Tank heat leak
- Unloading displacement vapor
- Flash vapor
- BOG headers
- Compressors
- Recondenser integration
- Fuel-gas use
- Return vapor
Operating context
How the topic connects to plant operation
- Pressure-control strategy
- Compressor sequencing
- Unloading-mode changes
- Sendout-demand interactions
Safeguards and controls
Protection and risk-control context
- Header pressure limits
- Compressor protection
- Relief and vent systems
- ESD integration
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
- BOG PFD
- BOG P&ID
- Control narrative
- Operating philosophy