Pressure Safety Valves (PSVs)
Understand the purpose, terminology and process-safety role of pressure safety valves protecting LNG equipment and piping against credible overpressure scenarios.
System context
Pressure relief
Technical topic pages show the knowledge scope behind LNG University learning. Course, assessment and credential availability depends on the applicable program.
Relevant roles
Operators · Mechanical technicians · Process engineers · Process-safety professionals
Prerequisites
P&ID fundamentals · Basic pressure systems
Knowledge level
Intermediate technical coverage with system and operational context.
Learning outcomes
What this topic is intended to help you understand
- Differentiate set pressure, accumulation, overpressure and blowdown concepts.
- Identify common protected equipment and relief destinations.
- Explain why isolation, inspection and change control around PSVs are tightly governed.
Technical scope
Equipment, concepts and terminology
- Spring-loaded and pilot-operated concepts
- Set pressure
- Overpressure and accumulation
- Blowdown
- Inlet and outlet piping
- Relief headers
- Flare or vent destinations
- Relief scenarios
Operating context
How the topic connects to plant operation
- Recognizing signs of lifting or leakage
- Understanding relief-path availability
- Monitoring protected-equipment pressure
Safeguards and controls
Protection and risk-control context
- Locked or controlled isolation
- Inspection and testing
- Relief-system design basis
- Management of change
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
- Relief-valve data sheet
- P&ID
- Relief study
- Equipment design data