Each tank has an inner 9% nickel dome and an outer carbon steel dome that act as a protective barrier to prevent leaks, accidents, or external damage. The double-dome design provides maximum safety and structural integrity, which is essential in an earthquake-active region like Taiwan. This design also adds weight and engineering complexity to the build.
In August 2025, the project team achieved a major milestone by completing the roof air raise for the first LNG tank. Because of the seismic double-dome design, the roof had a combined weight of more than 2.8 million pounds (1,307 metric tons) — the heaviest roof ever lifted by air in 91ÖÆÆ¬³§â€™s history.
When complete, the project will have placed more than 31,500 cubic meters of concrete piles, 44,300 cubic meters of structural concrete, 6,200 metric tons of 9% nickel steel plates, 2,550 metric tons of carbon steel plates, 8,000 linear meters of piping, and 70,000 linear meters of electrical and instrumentation cables.