LTD Gauge

Our LTD Gauges are an integral component of a comprehensive LNG storage tank instrumentation solution. The Whessoe LTD Gauges - designed and manufactured by Svanehoj - were the pioneers in offering a level, temperature, and density (LTD) gauge specifically for floating storage applications. Today, these LTD Gauges stand as the most advanced in the industry.

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A reliable and proven technology

LNG storage facilities must have precise instruments that measure temperature, density, and level variations. Our LTD gauge is a part of our total LNG storage tank instrumentation solution. This is the world’s most advanced LTD gauge currently available on the market. With more than 330 installations in onshore LNG tanks worldwide, we ensure a reliable and proven technology.

The LTD Gauge contributes to high safety by analyzing the contents and ensuring that rollover and stratification do not occur in the tank.

Specifications

Range: Standard 0-60m (maximum 70 m)

Accuracy: +/- 2 mm

Resolution: 1 mm
Range: -200°C to +50°C

Accuracy: +/- 0.1°C

Resolution: 0.01°C

Sensor type: Pt100 Class AA, IEC60751
Range: 400 kg/m3 to 1000 kg/m3

Accuracy: +/- 0.5 kg/m3

Resolution: 0.1 kg/m3

Viscosity: < 0.6x10⁻³Pa s

Sensor type: 01206-06-

Comprehensive Solutions for LNG Storage

At Svanehoj, we offer more than standalone instruments. Our solutions encompass complete safety systems tailored to onshore LNG operations. The LTD Gauge is complemented by advanced systems like the Data Acquisition System (DAS) to provide seamless monitoring and control of onshore storage.

Data Acquisition System

The Data Acquisition System (DAS) is a critical component for monitoring LNG storage tanks. It serves as a hub for collecting and processing data from field instruments, ensuring seamless communication with the terminal’s Distributed Control System (DCS).

THE DATA ACQUISITION SYSTEM IS COMPOSED OF

The PLC-based acquisition system.
The HMI in the control room.

KEY FEATURES

Redundant architecture: The DAS offers full redundancy for power supply, I/O modules, and CPUs, ensuring uninterrupted operations.

Enhanced security: The DAS offers full redundancy for power supply, I/O modules, and CPUs, ensuring uninterrupted operations.

Modular design: A flexible, scalable architecture supports system evolution and upgrades.

Data communication: Equipped with redundant Ethernet and RS 485 Modbus connections, the DAS facilitates reliable data transfer.

Rollover Predictive Software

The Rollover Predictor is advanced software designed to prevent LNG stratification risks. The rollover prediction software integrates an automatic mode where the chemical composition calculation is based on measured parameters (density, temperature and operating pressure) from the LTD gauges.

KEY FEATURES

Real-time composition monitoring: The DAS offers full redundancy for power supply, I/O modules, and CPUs, ensuring uninterrupted operations.
Predictive capabilities: The DAS offers full redundancy for power supply,
I/O modules, and CPUs, ensuring uninterrupted operations.
Automatic integration: A flexible, scalable architecture supports system evolution and upgrades.
Validated accuracy: Its predictive models have been experimentally validated for precision.