About 3 PE anticorrosive pipe service life make people concern, appeared more and more researchers to the question in the production of 3 PE anticorrosive steel pipe has a complete set of production technology abroad, life also get the attention of people, three layers structure of polyethylene anticorrosive coating (3 PE) a combination of fusion bonded epoxy powder coating and extruded polyethylene fine properties of two kinds of anticorrosive coating, the interface characteristics of fusion bonded epoxy powder coating and chemical characteristics, and advantages of extruded polyethylene anticorrosive coating mechanical protection feature, so as to significantly improve their performance. As a result, the outer layer of the buried pipeline is very superior. According to the relevant information, the 3PE embalmed steel pipe can make the buried pipeline life reach 50 years, at present, is considered to be the most advanced pipeline anti-corrosion technology in the international. In our country, 3PE is the first to be used in the oil and gas system. Our country has built the shaanxi and Beijing natural gas pipeline and the ku-shan oil pipeline, the recent state key project west gas east of the west gas to lose nearly 4000 kilometers of the pipe all adopted three layers of PE coating. At the same time, the 212km pipeline is also adopted in the 37-km high pressure pipeline, 30 km of the outer ring line, and the 122km pipeline for the underground storage gas reservoir in shaanxi and Beijing. It has become the development direction of the corrosion coating for future pipelines.
3PE anticorrosion structure: first layer epoxy powder (fbe > 100um), layer 2 adhesive (AD) 170 ~ 250um, third layer polyethylene (PE) 2.5 ~ 3.7 mm. The three kinds of materials fuse together, and combine with the steel tube to form excellent corrosion protection layer. Pipe diameter ranges from 60 to 1420, the wall thickness range between 2.5 to 18 mm, this is a good anticorrosion method, generally can improve the service life of 50 years, not only extended the underground pipeline equipment replacement cycle, and greatly saves the cost. 3 PE anticorrosive steel pipe anticorrosion is the most commonly used method, in addition to 2 PE, pp, 2 3 pp, their manufacturing process is similar, just different raw materials, the characteristics of the anticorrosion is repairing welding process simple, (repairing) heat shrinkable belt way anticorrosive effect is good, price is low, is generally recognized by the pipe manufacturing anti-corrosion methods
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