The Hong Kong branch of the Second West – East Gas Pipeline consists of two sections from Shenzhen to Hong Kong: the Qiuyuling – Dachan Island subsea pipeline and Dachan Island – Longgutan subsea pipeline.
The pipeline will be constructed using the Zhong You Hai 101 pipelay vessel, which will lay welded pipe offshore Dachan Island near Shenzhen, Guangdong province.
Covering a total length of 29 km, with a transmission station in Dachan Island and a receiving station in Longgutan, the Shenzhen – Hong Kong subsea pipeline has a designed transportation capacity of 6 Bcm/a.
The pipeline will help Hong Kong gas supply and help reduce its reliance on coal and will lower carbon emissions from power plants, improving air quality in the region.
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The Second West – East Gas Pipeline will consist of one trunk line that will have a total length of 8,704 km and eight branches, is designed to have a transport capacity of 30 Bcm/a.
Commencing at Horgos in Xinjiang Uygur Autonomous Region, the pipeline will be connected to the Central Asia – China Gas Pipeline. After traversing 14 provinces, autonomous regions and municipalities, the Second West – East Gas Pipeline will end at the Hong Kong Special Administrative Region.
When operational, the pipeline will transport natural gas imported from Central Asian countries and gas produced domestically in the Tarim, Junggar, Tuha and Ordos basins to the Pearl River and Yangtze River delta areas and the central west part of China.
The pipeline can replace 76.8 MMt of standard coal, reducing emissions of carbon dioxide and sulfur dioxide.
Construction of the Second West – East Gas Pipeline commenced construction in February 2008. The project is divided into western and eastern segments, with Zhongwei in Ningxia Hui Autonomous Region as the midpoint.
Technological breakthroughs
China National Petroleum Corporation (CNPC) used significant and intensified research to help in the construction of the Second West – East Pipeline. CNPC developed, and manufactured domestically, seven new products in four categories. These include large-diameter high-steel-grade pipe materials and pipe products, such as a new X80 steel welding wire and flux that helps to increase the welding speed up to 1.7 m per minute – 30 per cent higher than the speed in the First West – East Gas Pipeline, with a welding qualified rate as high as 98.89 per cent.
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