Features and uses of welded pipe

Welded steel pipe is welded to the strip or plate blank bent into a different way tube, and subjected to different welding methods, to obtain a certain strength of the weld to form a closed pipe section four weeks. Pipe production materials are widely applicable, including carbon steel, alloy steel, high alloy steel, non-ferrous metals and their alloys. Various sectors in the national economy: pipes are widely used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, is the development of 20 key products. For the transport of liquids: water supply and drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural purposes: as piling pipe for bridges; docks, roads, buildings and other structures tube.

The main advantages of pipeline:
1 low capital costs, and rail transport infrastructure charges can save more than 1/3, while the railway transportation capacity is twice;
2 simple construction, construction speed, usually laying on the ground, safe, reliable and adaptable to a variety of terrain;
3 transport operation, low cost, high degree of automation can be achieved with other methods of transportation than pipeline transport is the cheapest, and its rail freight is only 1/10, water, 1/2 or so.

Currently, the world piped oil, increasing the proportion of steam, and gradually expand the scope of delivery varieties, not only oil and gas, all kinds of chemical raw materials and products, but also in research piped solid material, the so-called slurry shipping. Oil pipeline transport development direction is toward large-diameter, high-pressure direction. Traffic and power is proportional to the pipe diameter 2.66. Increased pressure can be extended away from the station, reducing the number of stations, thus saving investment and management costs, while providing for the selection of sites for the larger mobility, changes in transmission capacity on adaptability. With oil and natural gas industry, pipeline construction has developed rapidly. World fifties pipeline length of approximately one million kilometers, the sixties up to 1.5 million kilometers, while in 1970 only U.S. pipeline length is reached 1,428,800 km, for the same period, more than three times the length of railways. According to incomplete statistics, in 1970 the total world's total pipeline length of 4.5 million km.