Development of natural gas pipeline

1806 the first natural gas pipeline made of lead was installed in London;1891 the United States built the first gas pipeline of about 200km long;1925 the United States built the first welded steel pipe natural gas pipeline;1958 Canada built the first 3000km long pipeline;1967 the first high-pressure, high-grade steel (X65) transnational gas pipeline (Iran to Azerbaijan) was completed;1970 North America began to apply the X70 pipeline for natural gas pipeline;1994 German constructed X80 grade pipeline (Ruhr pipeline);2002 Canadian built 1km X100 grade steel test section;2004 Canadian built 1.6km X120 grade steel test section.APl5Lstandard was firstly posted in 1926 by API, initially including A25, A, B three grades, the minimum yield values were 172, 207, 251MPa.APl5LX standard was released in 1947, which adds X42, X46, X52 steel three grades, the minimum yield values were 289, 317, 358MPa.Since the year of 1966, has released the X56, X60, X65, X70 four kinds of steel grade, the minimum yield values were 386, 413, 448, 482MPa.1972 API released U80, U100 standard, the minimum yield values were 551, 691Mpa, and then the API turned U80, U100 to X80, X100.In 2002, API and ISO developed a new work item at the same time, its purpose is to add ultra high-strength steel grade from X90 to X120 into the ISO 3183 and API 5L.X90, X100 and X120 three steel grades have been included in API Spec 5L line pipe specification released in 2007 44th edition, the practical application of their final major step forward.Rough statistics, the world before 2000 X70 amount about 40%, X65, X60 are hovering around 30%, small caliber refined oil pipeline is also a considerable number of X52 steel grade selection, and more for HFW steel pipe. China's high-grade steel line pipe started late, but the pace of research and development and application of fast. Of just 10 years, reached the X80 steel grade applications, and has made a leap of progress, after the United States and our Rocky Second West-East pipeline built, X80 pipeline total mileage from the last century, two development of more than 000 km to 10 000km; Second West X80 steel grade used mainly in the X80 line pipe has to catch up with the development and application of advanced international level, a leading; from 2006 to 2007, China successfully developed X100 and X120 line pipe.Developing trend of steel grade summarized as follows:1. Through technical innovation and the use of higher pressures and higher strength pipe,  reducing the cost of long distance transportation of natural gas is the most effective way.2. The natural gas pipeline pressure in 30 years increased from the initial 0.25MPa to 14MPa. Improve the delivery pressure of the pipeline requires a higher intensity.3. Natural Gas Pipeline construction worldwide from the past use of the X52, X60 and X65 to X70 and X80 pipeline steel development of high-strength steel, and is developing X90 ~ X120 ultra high strength steels.