Case Study-3
Case Study – LNG Compression System
Scope: Design of Compression System to sustain LNG production at declining reservoir pressure
Challenge:
• Declining reservoir pressure below 70 bara impacting LNG production
• Wide operating range (21–70 bara, varying temperature and flow)
• Risk of compressor surge, hydrate formation, and liquid carryover
• Need for long-term operability over field life (20+ years)
Engineering Approach:
• Complete system integration including suction drum, compressor, coolers, discharge drum.
• Advanced compressor control using CCC system (performance + anti-surge).
• Multi-stage separation to ensure dry gas to compressor
• MEG injection and temperature control to prevent hydrates
• HIPPS and safety valve integration for overpressure protection
Key Design Features:
• Stable compressor operation across full operating envelope
• Efficient liquid separation (< 13 L/MSm³ carryover)
• Heat integration via aftercooler and overhead cooler
• Flexible operation with bypass and future subsea compression integration
Results:
• Reliable LNG production at low reservoir pressure
• Enhanced system safety and protection against surge and overpressure
• High operational flexibility and smooth start-up/shutdown
• Reduced risk of hydrate formation and liquid damage to equipment
Value to Client: Integrated process engineering ensured safe, reliable and future-ready compression system without operational bottlenecks.
Support: Available for gas compression, LNG systems, and complex process design challenges