Chinese state oil company CNOOC has begun construction work on six new LNG tanks at its terminal in Binhai Port Industrial Park, Jiangsu, China, at a cost of CNY 6.1 billion (€784.4 million).
The first phase of development has four 220,000 m3 tanks, but the six new tanks will each have a capacity of 270,000 m3, taking the total capacity to 6 million tonnes. Completion is expected by the end of 2023. The development is expected to help China towards its goal of reducing carbon emissions.
The construction of such ultra-large LNG tanks poses a number of engineering challenges, but CNOOC says that its years of research at projects in places including Tianjin, Fujian, Zhejiang, Shanghai and Jiangsu, has overcome these. The tanks will be built to CNOOC’s own designs. Its engineers have researched more than 30 kinds of loads of more than 500 different working conditions of the tanks to develop an optimal design from the ground up.
CNOOC’s tanks will have a specially designed pile foundation design to provide stability, and the company says that its engineers have also carried out stability analysis of large-span thin-shell structures and solved problems related to the design of ultra-high shear wall seismic isolation. The domes of the tanks have a span of almost 100 m, which the company says is close to the limits possible. Construction of the tanks will require technological breakthroughs in large-span reticulated shell structure air-lifting, large-span steel-concrete structure construction, mass concrete construction, group tower operations, and multi-source horizontal pre-stressing.
‘The project will have a positive influence on optimising the energy structure, protecting the environment, and accelerating the industrial transformation of the Yangtze River Economic Belt. Compared with coal, oil and other energy sources, 6 million tonnes of LNG can reduce carbon dioxide emissions by 18.82 million tonnes and reduce nitrogen oxides by 334,000 tonnes, which is equivalent to planting 40 million trees. The green and low-carbon effect is significant,’ says CNOOC in a statement.