The use of natural gas as a source of energy has been boosted around the world. In fact, a great number of LNG processing and storage plants are been designed and built in recent years. For instance, the Dajeh plant, built by the Japanese company IHI.

This deposit has a LNG storage capacity of 148,000 m3 at -165ºC. The external tank is made of structural concrete and has a 81.80m inner diameter. It is 37 m high and it has a concrete dome.

Since it is located in a high/normal risk seismic area, structures are analysed and sized taking this into account. Therefore, foundation is composed of Ø 1m piles which are 40m deep and embedded in the slab.

Some of the most significant features of these structures are: a monolithic joint of the foundation piles to the bottom slab with a thickness of 1m; the fact that the 0.80 m thick perimeter wall is embedded into the bottom slab; postensioning of the bottom slab through circumferential cables; postensioning of the perimeter wall by means of horizontal and vertical cables and a reinforced concrete dome with a minimum thickness of 0.40m embedded in the ring that culminates the perimeter wall with two-layered concrete.