The feasibility study of the offshore section was conducted by Saipem, a subsidiary of Eni. Planning was done by INTECSEA, a subsidiary of WorleyParsons. Giprospetsgas, an affiliate of Gazprom, has been appointed as a general design contractor. The offshore pipeline is planned to carry 63 billion cubic metres (2.2 trillion cubic feet) of natural gas per year. It will have four parallel lines with capacity of 15.75 billion cubic metres (556 billion cubic feet) each. The offshore pipeline will use pipes with a diameter of 32 inches (810 mm), designed for 27.73 megapascals (4,022 psi) of working pressure and having the pipe wall thickness of 39 millimetres (1.5 in). The first line should be ready by the end of 2015, the second and third lines by the end of 2016, and the forth line by the end of 2017. The offshore section is expected to cost €10 billion.
Pipeline sections in Bulgaria, Serbia, Hungary, and Slovenia will have capacity at least 10 billion cubic metres (350 billion cubic feet) per year. The onshore pipeline will have eight compressor stations and it is expected to cost €6 billion.
At least two gas storage facilities would be constructed of which one would be an underground storage facility in Hungary with capacity of minimum 1 billion cubic metres (35 billion cubic feet) and another one in Banatski Dvor, Serbia with capacity of 3.2 billion cubic metres (110 billion cubic feet). Hungarian oil and gas company MOL Group has offered its empty natural gas field at Pusztaföldvár as a 9 billion cubic metres (320 billion cubic feet) storage facility. British Melrose Resources is planning to convert the Galata offshore field in Bulgaria to a gas storage facility with initial capacity of 1.7 billion cubic metres (60 billion cubic feet) by 2009. There are also allegations that the South Stream pipeline will be connected to the Wingas-owned Haidach gas storage.
Read more about this topic: South Stream
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