Skangas LNG Production (Skangas) is the LNG production plant at Risavika. The annual production capacity is 300,000 tonnes of LNG.
There is an LNG bunkering facility for marine customers linked to the plant.
The activity at the LNG plant
Natural gas is brought from Kårstø to the LNG plant through the Lyse pipe system. At the LNG plant the gas first passes through a cleansing process where CO2 and water are separated out. Thereafter the gas is piped through the actual processing plant, which in principle functions in the same way as a freezer chest. Here the natural gas is cooled down to approximately 163°C below zero and changes into liquid form.
The liquid natural gas is stored in a large tank which is built like a thermos. The storage tank is designed for up to 28,000 m3 of LNG. The tank is built with a number of barriers, and consists of an external concrete tank and an internal steel tank. The walls of the concrete tank are made of 80 cm thick reinforced concrete. Internally, the tank is clad with steel plates to make it gas tight. Between the concrete and steel tanks, there is an insulation layer of about 1 m thickness. The LNG is stored at atmospheric pressure. From the storage tank the LNG is loaded on board ships or tank lorries for transport. Vaporised gas from the storage tank is piped out to the Lyse regional gas distribution grid.
Skangas at Risavika is comprised of the Major Accident Regulations’ various requirements. The Act relating to the Prevention of Fire, Explosion and Accidents with associated regulations imposes requirements regarding safety level in enterprises handling hazardous substances and a particular information duty for enterprises with a major accident potential. In addition, a safety report has been submitted to the authorities in compliance with the regulations.
What is LNG?
LNG (Liquefied Natural Gas) is natural gas that has been cooled to approximately 163°C below zero. Refrigeration causes the gas to condense and change from gas to liquid form, which leads to the gas volume being reduced 600 times. LNG is odourless and colourless, and its specific gravity is less than half that of water (0.45). Any spills of LNG will quickly evaporate and change into natural gas. Gas in liquid form may be transported in tank lorries/containers or specially constructed ships. Production of LNG enables new geographical areas that are without access to gas through pipe systems, to start using natural gas.