Yokogawa's Integrated Solutions Contribute to Safe and Steady Production at Gas Liquefaction Plant in Norway

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Executive Summary

<img src="/success/img/iab-suc-skangass-01.jpg" alt="Skangass AS, Stavanger, Norway" width="174">
Skangass AS, Stavanger, Norway

Skangass AS, 100% owned by Lyse AS, was established in 2007 with the aim of building and operating medium-sized low carbon emission energy plants. The company recently completed construction of a natural gas liquefaction plant at Risavika in Sola municipality that produces 300,000 tons of LNG per annum. The plant receives natural gas from a field in the North Sea via a 50 km high pressure pipeline from Kårstø that was built by Lyse.

This plant has all the facilities necessary for every phase of the natural gas liquefaction process, including CO2 removal systems, a 30,000 m³ storage tank, a coil wound heat exchanger is used as main cryogenic heat exchanger, a Linde multi-refrigerant cascade process, and utilities for the generation of electricity and steam. To ensure safe and efficient operations at this new plant, Yokogawa Europe successfully installed an integrated plant process control system consisting of a CENTUM VP distributed control system (DCS), FAST/TOOLS supervisory control and data acquisition system (SCADA), ProSafe-RS safety instrumented system (SIS), and Omegaland operator training simulator (OTS). The plant has been running smoothly since becoming fully operational in 2010.

Plant process overview
Plant process overview

The Challenges and the Solutions

1. OTS for familiarization of liquefaction processes and operator training
Skangass needed to avoid any delays in getting this new plant fully operational, and key to that was having all plant personnel fully trained right from the start of operations. For the first time ever, and in a team effort with Skangass, Yokogawa configured a full stimulation type operator training simulator for a gas liquefaction plant, employing the same safety and automation system (SAS) as the actual plant, with fully identical operational functions. This high fidelity model of the natural gas liquefaction process behaves exactly like the actual plant and allows plant upsets and equipment malfunctions to be simulated in a stimulative training environment. This makes it possible for operators at Skangass to undergo repeat training for a full range of situations.

2. System integration optimizes total plant operation
Key to maintaining safe operations is for the operators to know in real time what is happening throughout the plant. This has been made possible through the complete integration by Yokogawa of the plant's CENTUM VP DCS, FAST/TOOLS SCADA system, and ProSafe-RS SIS with other systems such as the tank gauging system. At their control stations, operators can easily call up and view trend chart, plant overview, alarm summary, and operation guide graphics, giving them the right information at the right time on processes throughout the plant.

For example, operators can confirm on screen the status and operating sequence for the plant's two drier absorbers, which alternate on a 24 hour schedule, with one unit operating and the other regenerating. To guard against thermal shocks during startup or shutdown, they also are able to monitor temperatures in the coil-wound heat exchanger, whose operation is key to the natural gas liquefaction process and which has been carefully configured in the CENTUM VP system. In real time, operators can monitor at their terminals remote terminal data that has been transferred via a general packet radio system link to the Yokogawa FAST/TOOLS SCADA system in the main office, contributing to the overall efficiency of the Skangass facility and ensuring increased safety and stable production.

With this integrated system, a single operator per shift can control the entire plant from the central control room.

One operator per shift in the central control room
One operator per shift in the central control room

GC1000 for LNG analysis

GC1000 for LNG analysis
Yokogawa GC1000 gas chromatographs sample the LNG components and transfer their readings to the CENTUM DCS. With this data, operators are able to adjust production specifications to meet the requirements of the company's LNG storage terminal customers throughout Scandinavia.

ROTAMASS for coolant flow measurement
ROTAMASS for coolant flow measurement
A Yokogawa ROTAMASS Coriolis mass flowmeter is used to measure flow in the lines that supply coolant to the plant's refrigeration facility. Operators have come to depend on its high accuracy and stability for determining whether sufficient coolant is being provided.


Customer Satisfaction

Roy Kenneth Skar, Operation Team Leader, said, "Yokogawa has strong experience in LNG processes, and their engineers understand our process. The project execution was done by engineers from Skangass and Yokogawa. The OTS really helped us to know the process. We are very satisfied with Yokogawa's systems for our liquefaction plant. Though our liquefaction rate is still a small portion of total gas supply from the North Sea gas field, we are expanding this LNG business continuously to meet market demand. A constant and steady operation and plant availability are mandatory to expand our business."

Mr. Skar
Mr. Skar


Zugehörige Produkte & Lösungen


Die klare und einfache Architektur von CENTUM VP besteht aus HMI, prozessnahen Komponenten sowie einem Steuer- und Regelungsnetzwerk.

GC1000 Mark II

The ability to perform discrete separation and positive identification of components and measurement of the composition without interference is an advantage of the gas chromatograph. The process gas chromatograph is widely used in many industries.


Das Sicherheitssystem ProSafe-RS wurde von der deutschen Zertifizierungsstelle (TÜV) zertifiziert und erfüllt die Sicherheitsstufe (SIL) 3 nach IEC 61508. Das System wird bereits in mehr als 2.100 Projekten eingesetzt – von großen integrierten Automationsprojekten bis hin zu Standalone-Lösungen. Die ProSafe-RS-Sicherheitssysteme von Yokogawa zeichnen sich durch ihr durchdachtes Design, lebenslangen Support und lange Lebensdauer aus.


SCADA Software (FAST/TOOLS) wurde im Rahmen des Flexible Advanced System Techniques (FAST)-Projekt entwickelt und ist heute eine umfassende vollintegrierte SCADA-Anwendungssuite. Das leistungsstarke und flexible FAST/TOOLS unterstützt Anlagen von Prozessen mit 50-Punkt-Einheiten bis hin zu Offshore-Produktions- und -Pipelinesystemen mit mehreren Millionen Punkten, die sich über Tausende Kilometer erstrecken.

Prozessleitsysteme (PLS)

Unsere Prozessleitsysteme (PLS) ermöglichen die Automation und Regelung von Industrieprozessen und optimieren die Produktion von Unternehmen in der Prozessindustrie. Mehr als 10.000 Anlagen vertrauen zur Erreichung ihrer Produktionsziele auf das PLS von Yokogawa.


Unser IoT-kompatibles SCADA-System (Supervisory Control and Data Acquisition) optimiert die Automation und Überwachung im gesamten Unternehmen.


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