South Pars gas field is the largest independent gas reservoir in the world, belonging to Iran and situated in the Persian Gulf next to Qatar's North Dome gas field.

Assalluyeh is located 300 km south east of Bushehr province.

The development of these two phases delivers 2400 mmscfd natural sour and rich gas which is transported to Assalluyeh gas refinery through two pipelines. The refinery refines the input gas to 50 million cubic meters of natural sweet gas per day, together with 80,000 barrels of condensate. In addition, it produces more than 1 million tons of LPG and about 1 million tons of Ethane gas per year. It also produces 400 tons of Sulfur per day.

The offshore platforms were constructed by IOEC who also laid the subsea pipelines. IOEC is a partner in the trilateral consortium which also included GS E&C; the Korean Company.

The onshore portion which was undertaken by OIEC consisted of design and procurement of about 50% of onshore plant, as well as the whole construction of the onshore site.

The project was initially planned to be completed in 52 months, however, due to changes that were made, it was actually finished in 60 months. The man-hours consumed was about 90 millions.

Due to environmental concerns, Tail Gas Treatment Unit (TGTU) was added to the units of the plant.

Some key figures:

290000 m3 concrete work

44000 tons of steel structure

2490000 inch diameters U/G and A/G piping

132000 tons of equipment erection

2130 km of electrical cabling

1950 km of instrument cabling

Since November 2008, the project has provisionally been under operation and in March 2009, the project was officially inaugurated.