Dry Gas Seals for Centrifugal Compressors
Study the purpose, arrangement and monitoring of dry gas seals used to limit process-gas leakage from centrifugal compressors.
System context
Compressor sealing systems
Technical topic pages show the knowledge scope behind LNG University learning. Course, assessment and credential availability depends on the applicable program.
Relevant roles
Mechanical technicians · Reliability engineers · Control-room personnel · Rotating-equipment engineers
Prerequisites
Centrifugal compressors
Knowledge level
Advanced technical coverage with system and operational context.
Learning outcomes
What this topic is intended to help you understand
- Describe the basic dry gas seal arrangement and seal-gas path.
- Recognize key differential-pressure and contamination risks.
- Relate seal-system health to compressor operating reliability.
Technical scope
Equipment, concepts and terminology
- Primary and secondary seals
- Seal-gas supply
- Separation gas
- Filters
- Differential pressure
- Leak-off monitoring
- Seal faces
- Contamination mechanisms
Operating context
How the topic connects to plant operation
- Monitoring seal-gas differential
- Recognizing abnormal leak-off
- Startup readiness checks
- Shutdown and depressurization awareness
Safeguards and controls
Protection and risk-control context
- Clean seal gas
- Pressure control
- Leak detection
- Interlocks and trips where designed
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
- Seal-system P&ID
- OEM manual
- Compressor cause & effect chart
- Alarm and trip matrix