In-Ground LNG Tank
The first in-ground LNG tank, with a capacity of 10,000 kl, was completed at Tokyo Gas’s Negishi LNG Terminal in 1970. Due to their safety and low impact on the surrounding landscape, more than 70 have been built as storage facilities in Japan and abroad in the more than 40 years since.
As the figure below shows, Tokyo Gas’s development of in-ground LNG tank construction technologies can be divided into three main periods. The first generation of tanks were constructed by the early 1980s as the early stage of development, while the second generation of tanks were constructed between the early 1980s and late 1990s, applying the results of developments on the deep slurry walls and large-scale reinforced concrete structures.
The development and construction of these large-capacity in-ground tanks earned Tokyo Gas the JSCE Award in 1996 and the JSME Award in 1997. The third generation tanks constructed from the early 2000s were the state-of-the-art structures designed for greater quality and cost performance. By applying the results of the development of cost-effective structures with rigid side walls and bottom slabs, it became possible to build them at lower cost. Using this technology, Tokyo Gas completed the world’s largest third-generation in-ground tank at its Ohgishima LNG Terminal, which has a capacity of 250,000 kl, in 2013.
In-ground LNG tanks
〔Development of in-ground and underground LNG tank construction technologies〕
Low cost in-ground LNG tank with rigid side wall and bottom slab structure
The most distinctive feature of third-generation in-ground tanks is their construction of the rigid connection of side wall and bottom slab. This cost-effective construction was made possible by applying the cutting-edge construction technologies such as 3D reinforced concrete non-linear analysis, large capacity pre-stressed concrete, and self-compacting concrete.
- Nonlinear analysis for 3D reinforced concrete
- Large-capacity PC cables
- Self-packing concrete
- Haunch construction