The piece is just part of the nearly 100m high mooring turret, the biggest in the world, which will keep Prelude safely connected to the seabed off the Western Australian coast.
The turret will run through the front of the vessel and connect to giant chains, holding the FLNG unit in place.
"Prelude FLNG combines our many years of experience in shipping and in managing complex LNG and offshore projects," Shell projects and technology director Matthias Bichsel said.
"It's great to see our innovative designs and technologies become a reality as we reach project milestones like this.
"Designed in Monaco, built in Dubai, shipped to South Korea and for use off Australia, the turret is an example of the truly global nature of this project."
Prelude will operate in the Prelude Basin for 25 years, producing about 3.6 million tonnes of LNG per year, with the turret designed to keep the vessel safe in category 5 cyclones.
