Compound steel pipe having an inner and an outer polymeric coating

Maxim V. Kalachev Naberezhnye Chelny branch of Kazan State Technical University named after Tupolev A.N Naberezhnye Chelny, Russian Federation bosch116@mail.ru
Igor A. Savin Naberezhnye Chelny branch of Kazan State Technical University named after Tupolev A.N Naberezhnye Chelny, Russian Federation savin64@rambler.ru
The main purpose of this paper isto provide a reliable and durable in operation of the pipeline, which has an inner and an outer polymer coatinginsulation and preservation of pipeline capacity and ease of installation. With the construction of long, fishing and pipelines, where the main type of connection is welding, pipewith an inner polymer coating and outer insulation so far used is limited. This is due to the fact that the mountingpipe during welding in a large coverage area of the weld burns. This is especially true of pipelines, inside of which can not get people (diameter 600 mm).Naked weld metal with prolonged contact with corrosive media is subjected to corrosion, which may be the cause of the accident.
Materials and methods
Metal polymers. Data of industrial research
Results
The analysis of existing methods of steel pipes with an inner polymer coating and the outer insulation. Identified shortcomings of existing techniques steel pipes having an inner and an outer polymeric coating of insulation, and the main cause of corrosion of the pipeline. The new technology of steel pipes, eliminating the drawbacks of existing methods.
Conclusions
The proposed method of connecting pipes with internal and external anti-corrosion coatings and device for its implementation compared with similar products:1. Retains uniformity pipeline construction, ieeliminates modified cross-sectional shapealong the length of the resultant compound of pipes, which prevents dynamic loads;2. Uniformity of the coating retains stykaemoy between the pipe and the pipe, increasing tightness, corrosion resistance zone of welded joint;3. Reduces the complexity and requirements for welding technology, as it is made of a homogeneous material and welding brewed one seam, that is, made the traditional welding, which mastered in organizations involved in installation and laying of pipelines;4. Eliminates the use of expensive corrosionproof materials (steel, alloys) as a protection zone of the welded joint, etc.In this method, the application has been sent to Rospatent for invention. In February 2013 was given a positive result.
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pipeline the zone of welded joints pipe joints pipe coating