In the global energy market, liquefied natural gas (LNG) has emerged as a critical fuel source—valued for its transportability, high energy density, and relatively low carbon footprint. With the increasing scale and complexity of LNG trade, ensuring accurate and reliable tank gauging has become essential, particularly in custody transfer and inventory control applications. This is where advanced LNG tank gauging systems play a pivotal role.
Modern LNG tank gauging systems integrate multiple technologies to provide high-accuracy, real-time data. Key components include:
1. Level Measurement Instruments
Servo Tank Gauges (STGs): Provide extremely accurate level measurement based on displacement.
Radar Level Gauges: Use microwave signals to measure liquid level without direct contact—ideal for cryogenic and pressurized tanks.
2. Temperature Profiling Sensors
Multi-point temperature sensors are placed vertically throughout the tank to calculate accurate liquid density and stratification, which directly affect volume measurements.
3. Pressure Transmitters
Vapor space and liquid pressure measurements are used to calculate vapor density and ensure tank integrity.
4. Tank Side Monitors (TSMs)
These act as local data concentrators, integrating signals from all field instruments and providing digital or analog output to the DCS or inventory management system.
5. Inventory Management Software
Provides real-time visualization, volume calculations (based on strapping tables and API standards), historical trend tracking, and automated reporting for both inventory and custody transfer operations.
Benefits in Custody Transfer and Inventory Control
✔ Accurate Volume and Mass Calculation
Integrated density and temperature compensation allows for exact conversion to mass or standard volume, critical for financial transactions.
✔ Operational Transparency
All parties involved in LNG transfer can access the same verified data, reducing disputes and ensuring trust.
✔ Enhanced Safety and Reliability
Continuous monitoring of tank conditions helps detect leaks, overfills, or unsafe pressure levels in real time.
✔ Regulatory Compliance
Built-in reporting features ensure accurate logs and audit trails for compliance with national and international standards.
As LNG continues to grow as a key component of the global energy mix, the need for advanced tank gauging systems has never been greater. Whether it’s managing onshore LNG storage terminals, ship-to-shore transfers, or floating LNG units, having a reliable, certified, and high-precision tank gauging solution is essential for both operational efficiency and financial integrity.