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The Prelude FLNG. Image courtesy of Shell.

The largest piece of the turret for Royal Dutch Shell’s Prelude Floating Liquefied Natural Gas (FLNG) facility set sail Friday from Dubai to the Samsung Heavy Industries shipyard in Geoje, South Korea.

The turret is part of a mooring system that will allow Prelude FLNG to operate safely in the extreme weather conditions.

At almost 328 feet (100m) high, the turret is the largest in the world.

The turret will run through the front of the facility and connect to giant chains that will keep it securely moored over the Prelude gas field.

The Prelude field is in the Browse Basin off the northwest coast of Australia.

The basin has proven reserves of 34.6 trillion cubic feet (Tcf) of gas and estimated reserves of 60 Tcf.

Shell operates and owns a 67.5 stake in the Prelude field.

Japan-based INPEX owns a 17.5 stake, Korea’s state-owned KOGAS holds a 10 percent share and the US government’s Overseas Private Investment Corporation holds a 5 percent stake.

The facility is expected to produce 3.6 million tonnes per annum (mtpa) of LNG, 1.3 mtpa of condensate and 0.4 mtpa of LPG for export.

The Prelude FLNG facility will be 1601 feet (488m) long and about 242 feet (74m) wide.

It will weigh more than 600,000 tonnes fully ballasted, or roughly six times as much as the largest aircraft carrier.

The facility will be moored at the Prelude field for 25 years.

After its stay at the Prelude field, the facility will be moved to a new location for another 25 years.

Shell hasn’t announced a completion date for the facility.