CROSS-INDUSTRY ROSEMOUNT TANK GAUGING SYSTEM
Skangas LNG Terminal Uses Complete System
Solution for Reliable and Safe Operation
RESULTS
•2oo3 voting prevents multimillion production stop
•No unplanned shut-downs or maintenance requiring
opening the cryogenic tank
•Quick and safe process to make proof-testing for
authority requirements from control room
•Process control with complete temperature solution
APPLICATION
Storage and distribution of energy for production processes in nearby
industries. Within the terminal area there is a 42 m (138 ft.) high, above
ground concrete tank, 30 000 m
3
(1 million ft
3
) storage capacity, a
compressor tank and vaporizers. Most of the LNG feedstock comes
from the Skangas liquefaction plant in Norway, and the rest from nearby
countries. LNG arrives via company owned ships, which are also used for
ship-to-ship transfer. In addition to shipping, liquefied product is also
distributed via company owned trailers to end customers. Furthermore,
gasified product is distributed to the neighbouring refinery via pipeline.
CUSTOMER
Skangas in Lysekil, Sweden, is one of four LNG terminals operated by
Skangas in Scandinavia. Half of the volume handled within the com-
pany comes from the Lysekil hub. Skangas is the biggest distributor of
liquefied natural gas (LNG) in the Nordic countries.
CHALLENGE
Skangas Lysekil is the world leader in small-scale LNG handling. The big
challenge is to be cost efficient, and operate safely with remained
profit using only one tank. Logistics is demanding. If the production in
the nearby refinery is closed down due to a stop of energy supply, the
estimated cost is $5M or more. It is critical to not have any unplanned
shut-downs. Also, the product and storage in itself is challenging.
Temperature control is vital to avoid unwanted boil-off resulting in
vaporized product. The normal temperature for LNG is -158 °C (-252
°F), but it boils at -110 °C (-166 °F). An LNG tank is very rarely, if ever,
opened during its lifetime. Opening a tank means you need to be able
to safely use all of the content at once or it will evaporate. It is also very
time consuming and expensive to cool down a tank and restart it. To
avoid service, the requirement is an accurate and very reliable system.
SOLUTION
Radar technology was the preferred choice since it involves minimum
maintenance. The tank uses three Rosemount™ 5900S Radar Level
Gauges with an LNG antenna, suitable for cryogenic temperatures,
configured with 2oo3 voting. It requires alarms from at least two of
the three gauges to shut down the process, thereby avoiding serious
effects of a potential false alarm. In addition, having three gauges
means there is always one spare part in usage.
“We don´t take any risks. A stop in
operation is not an option, so we
use the 2oo3 principle for safety
and maintenance purposes.”
Benny Johansson, Terminal Manager, Skangas
The LNG system includes measurements for level,
temperature, pressure, density and flow. Level,
temperature and pressure devices are tripled for
maximum availability and safety. Redundancy is also
required for other units such as gas detectors.
Remote proof testing is another system safety feature,
done one to two times per year. Testing the safety
loops and doing it from the control room minimizes
risks with climbing the high tank.
CROSS-INDUSTRY
“With 99.5% availability require-
ment there is no room for a stop.”
RESOURCES
Rosemount 5900S Product Data Sheet
Rosemount 2240S Product Data Sheet
Rosemount 565, 566, 765 Product Data Sheet
LNG Brochure
Standard Terms and Conditions of Sale can be found on the Terms and Conditions of Sale page.
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Temperature is measured using a Rosemount 2240S Temperature
Transmitter with a 4-wire calibrated Rosemount 566 cryogenic
multiple spot temperature sensor. For tank cool-down and leak
detection purposes, the same temperature transmitter is used with
the Rosemount 614 temperature sensor. The complete system also
includes TankMaster Inventory Management Software, Rosemount
3051S pressure transmitters, Tank Hub, System Hub, Level/Tempera-
ture/Density Profiler (LTD) and more.
LNG is loaded to ship, trailer and pipeline to provide
clean energy for production processes in companies
within the nearby Scandinavian region.
5900S 5900S 5900S2240S 2240S
2240S
2240S
566 566 614
614
LTD
2oo3 voting ensures superior reliability and 24/7/365
operation.