LIQUEFIED GAS TANKS IN DAJEH LNG, GUJARAT

AND QATAR

CONSTRUCTION PROJECTS

India, 2001-2002. QATAR, 2003

• Several views of the tanks in Dajeh during

their construction. The size of this structure

is shown in the dimensions of the most

characteristic macro-units, which for the two

tanks of Dajeh are: 40,000 m of 1000 mm

piles, 30,000 m3 of structural concrete,

6,000 t of steel for reinforcement, partly of

“cryogenic quality”, 10,000 t of steel for

post-tensioning.

• Tanks of Qatar in construction

• Pictures of the calculation models

The use of natural gas as a source of

energy is being promoted worldwide and

at present a large number of processing

and storage plants for natural gas are

being built, including the Terminal Plant

of Dahej and the Central Plant of Ras

Laffan, built by the Japanese company

IHI.

The two tanks store liquefied natural gas

at –165ºC, with a total capacity of

148,000 m3 in Dajeh and 140,000 m

3 in

Qatar. The concrete outer tanks have an

internal diameter and minimum height of

81.80 and 37m respectively in Dajeh and

76.0 and 38.10m respectively in Qatar.

They are crowned by a large concrete

dome.

The place where they are located is

subject to high or normal seismic activity

and the structures were analyzed and

dimensioned taking this into account.

The foundations were made with 578,

1m in diameter and 40 m deep, piles in

Dajeh and 383, 9.5m deep, piles in

Qatar, embedded in the slab.

The most interesting aspects of these

structures are: a monolithic joint of the

foundation piles to the bottom slab, with

a constant thickness of 1m in Dajeh

(0.80 and 1.15m in Qatar); postensioning

of the bottom slab using circumferential

tendons (Dajeh); the fact that the 0.80m

thick outer wall is embedded in the

bottom slab; post-tensioning by

horizontal and vertical cables of the outer

wall, and a reinforced concrete dome of

0.40 minimum thickness embedded in

the ring that culminates the outer wall,

with two-layered concrete.