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With the majority of users realize a bit of plastic pipe, plastic pipe market expanding. Especially for large diameter plastic pipe demand is increasing. Because of technical and economic reasons, manufacturers of plastic pipe extrusion diameter is limited (since the diameter of not more than 2000mm, wall thickness of not more than 110mm. Poly latest news throughout North America and now manufactured diameter to 1600mm five extrusion lines.) In the irrigation works, water supply to small hydroelectric power station, mine water needs in areas such as the pressure of large diameter plastic pipe (usually the required pressure is not high.) Only by winding welding method (and possibly combined with the enhanced technology) manufacturing of plastic pressure pipes are likely to meet this large market demand. Members must pay attention to combination of enhanced technology, proven large diameter plastic pipe is difficult to achieve if the user did not enhance the performance of processing more than acceptable.