A complete range of gauges and software for monitoring LNG tanks

Svanehøj’s range of gauges, temperature transmitters and control systems ensure that your LNG storage tanks and their contents will always stay as safe as possible.
When you look for highly specialised applications where safety, accuracy, reliability, and repeatability are of prime importance, look no further than our Svanehøj Tank Control Systems.

Our total LNG storage tank instrumentation solution comprises the following, fully integrated system components
1) Fully automated LTD gauges
2) Fully automated Roll-over predictive alarm software
3) SIL-3 certified servo level gauges
4) Multi-spot temperature sensors
5) Tank bottom indicator
6) Tank cool down and lead section system
7) Tank data acquistino system

2. LNG ROLLOVER PREDICTOR

The key features and benefits: Monitoring of all site components that could affect LNG stratification. Accurate prediction of stratification and rollover phenomena. Full automatic detection of a rollover for up to 30 days at a time. The ability to make the right decisions at the right time – so that any corrective action can be taken. The use of a calculation module validated through experimental campaigns provides a high level of accuracy in the prediction.
3. 01143 Mark II Servo Level Gauge

Monitors level changes as small as 0.1mm.
Incorporating a single body concept, it accommodates all electronics, including the main power connection and redundant Modbus communication. The gauge is fully SIL-2 certified and, in a multigauge system application, conforms even to SIL-3. The gauge has successfully passed seismic testing.
4. 01706 / 01645 MULTISPOT TEMPERATURE TRANSMITTER

Handles up to 16 RTDs and 32 RTDs in its doubled version. It is linked to the level gauges for power and the communication of all measured data. With a daisy chain connection of up to 5 units in a local (IS) field-bus, it is capable of handling in-tank temperature probes, as well as leak detection and cool-down elements.
5. 01608 TANK BOTTOM INDICATOR

Models 01608 and 01609 allow field operators to observe all measured data coming from the level gauge and LTD respectively either from the local intrinsically safe bus or communication field bus.
6. TANK COOL DOWN AND LEAK DETECTION SYSTEM

Monitors the tempearure of the inner LNG tank during the cool down phase. The system also ensure that any LNG leakage is detected by a temperature drop measurement.
7. TANK DATA ACQUISITION SYSTEM

The Tank Data Acquisition System Cabinet receives and processes data from field instruments. This data can be linked back to our PLC based redundant acquisition platform or alternatively directly linked to the site’s DCS
1. 01146 LTD Gauge

The world’s most advanced LTD gauge based on Svanehøj Tank Control Systems’ unique single body concept. It accommodates all electronics and wiring, and is mounted on a single flange. Travelling at user configurable speeds, it samples 250 data points to construct a detailed and accurate LTD profile. Communication is via redundant Modbus.

Tank Data Acquisition System Cabinet

The Tank Data Acquisition System Cabinet receives and processes data from field instruments. This data can be linked back to our PLC based redundant acquisition platform or alternatively directly linked to the site’s DCS. In instances where the LNG tank gauging instruments are being linked directly to the site’s DCS system, configuration and maintenance tasks are handled through a portable PC, known as the LNG System Maintenance Supervisor®.

The Tank Data Acquisition System is composed of:

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

Key features and benefits:

Achilles Level 2, ISA secured certifications.
Hot standby architecture to ensure full redundancy without loss of data.
Built-in associated operating modules to provide a high level of security.
Full redundancy on field buses (RS 485 Modbus).
Redundant Ethernet-based communication between the CPU and the communication module.
A fully modular, evolutionary and open architecture.
Worldwide spare parts and support available for the system hardware.

LNG Rollover Predictor

The rollover predictor software is configured for the specific site for which it is intended. It is designed to run in live sites, regardless of the ongoing LNG operations. The software runs while any of the tanks (connected to the same vapour treatment plant) are being filled and/or discharged and takes such dynamic changes into consideration. However, the development of stratification of the tank contents, eventually leading to a rollover, is influenced by many factors far beyond the measurement capabilities of an LTD gauge. Factors that affect the creation, evolution and manageability of LNG stratification and rollover include both fixed (constructional) data and actual, live process data, are considered in the software. Since a rollover predictive calculation is automatically carried out every four hours, fully automatic and independent of manual entries, rollover predictor software will detect a rollover a maximum of 30 days in advance, leaving the operator sufficient time to take corrective actions.

The key features and benefits of the LNG Rollover Predictor include:

Monitoring of all site components that could affect LNG stratification.
Accurate prediction of stratification and rollover phenomena.
Detection of a rollover for up to 30 days at a time.
The ability to make the right decisions at the right time – so that any corrective action can be taken.
The use of a calculation module validated through experimental campaigns provides a high level of accuracy in the prediction.

Complete range and supply

No other company can match our portfolio of products, systems and solutions in these areas.

Whatever your needs, please don’t hesitate to contact us.

Get in touch

France

Fabrice Vandewalle

Sales Manager

+33 673190309

fva(at)svanehoj.com