At present, there are many different types of pipelines that are used for different applications around us, which generally consist of very long pipes with large diameters and are used to transport products such as crude or refined oil and natural gas long distances. Transportation pipelines can stretch between cities, countries and even continents. Steel pipelines, which lie buried for hundreds of years, has extraordinary properties including excellent stress crack resistance to natural gas and its contaminants, low permeation to methane and hydrogen, high HDB rating at 20°C, 60°C and 80°C, superior impact resistance, squeeze off, and dependable UV performance for outside storage. Galvanized steel pipe generally has the rational cost effective in the current steel pipe market.
Without pipelines our civilization would come to a screeching halt. For petroleum applications, pipeline materials have a very rigid design, specification, chemistry, and testing standardization and manufacturing requirements in use. Modern steel pipe manufactured to these exacting standards assures both high quality and safety in design. According to some records, by the late 1960s, with the further requirements of pipeline construction, steel pipe manufacturers began to form the pipe using a high frequency electric resistance weld, increasing the reliability of the longitudinal seam. Meanwhile, manufacturers universally applied improved coatings to new pipe, another advance in corrosion control. By the late 1990s, anti-corrosion coatings had improved further, and are tested before being placed in service to ensure that they have not been damaged during transport and construction. Pipelines are now installed with deeper cover, and bored crossings under highways and rivers provide greater protection and less potential for damage during installation.
Today, various types steel pipes have been widely used for pipeline projects, for in the ideal conditions, the good properties of cold rolled steel pipe do not degrade with the passage of time. However, it can not be denied that steel pipe is subject to corrosion in service and may suffer degradation from defects created during manufacturing or construction, or from the effects of careless excavations. It is also possible to prevent spills related to these factors by inspecting and testing pipe as it is being made and installed, by protecting it from corrosion, by protecting it from excavation damage and by performing periodic in service inspections or tests to locate damaged areas and repair them. Today, pre galvanized steel pipe is another important type of steel pipe widely used for pipeline construction in recent years. However, in practical applications, almost all of the steel tube users will encounter such a problem. That is to say, the pipes will inevitably be subject to varying degrees of damages over time.
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Post time: May-05-2019