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Therefore, the following range of 500 mm diameter, with PVC double wall corrugated pipe more economical; in a larger diameter range more suitable for polyolefin of double-wall corrugated pipe.

In the polyolefin double-wall corrugated polyethylene pipe in the flexibility of double-wall corrugated pipe is best, while the double-wall corrugated pipe rigid polypropylene high can be selected.

Information from abroad, the U.S. application of double-wall corrugated polyethylene pipe, a lot of experiments and research, there are more mature and more complete experience of standards and normthermowell s; some countries in Europe this year, with good impact properties of block copolymer Polypropylene PP-B double-wall corrugated pipe applications, rapid development, some well-known multinational manufacturing company of plastic pipe, such as PIPELIFE, UPONOR, WAVIN all such products have been developed. United States, Australia is also developing the underground pipes of polypropylene. This is a ipl lampe trend worthy of our attention. Borealis BORELIS also developed a non-pressure pipes with high stiffness polypropylene tubes, the elastic modulus reached 1.6Gpa (BA212E) and 1.8Gpa (BC50 * MOD). Whether it is done out of solid wall pipe, double wall corrugated plastic pipe or pipe fittings, this high rigidity polypropylene processing performance are good.

China's current production of direct extrusion of PVC double wall corrugated pipes are not many companies, the largest outside diameter 800 mm; have not seen the domestic production of polypropylene dipl lampenouble wall corrugated pipe message. Beijing Yanhua Plastics Industry Association and co-resin, ready to help China develop polypropylene double wall corrugated pipe. Previously, the production of large diameter double wall corrugated pipe production line is the introduction of all the recent efforts of some domestic machinery enterprises in the development of large-diameter double-wall corrugated pipe production grooving machine car fuel pumpline, and encouraging progress. However, the production of large diameter double wall corrugated pipe (diameter 500 to 1200 mm) of the production line is difficult to quickly localization. Several well-known abroad, double-wall corrugated pipe production line manufacturers (such as Canada CORMA, Germany's DROSSBACH company, FRANKISCHE company, UNICOR Company, HEGLER company) has conducted years of research has accumulated a wealth of experience and have a lot of invention patent, the domestic machinery enterprises also need to catch up with quite a long process.

3, if you decided to weld tube winding, choose what kind of design?

China from Germany, Korea and Finland (ongoing) introduced a winding pipe welding technology and equipment. There are also a number of winding machinery enterprises in the development and production of welding tube production line. Winding welded pipe have different design. Wall cross-section designs, in the same diameter andipl lamps under the ring stiffness is also a great difference between the consumption of materials. For example, according to our survey, similar winding welding pipe, Finland KWH design in the same diameter and the ring stiffness of the material under relatively low consumption.

Of course, the winding design of welded pipe materials can not only consider the savings, but also consider the possibility of forming the time of manufacture, impact resistance, ease of connection and reliability. China in the introduction and development of welding tube winding equipment to pay attention to absorb the advanced experience of foreigcopper screwn countries, special attention should be relatively the same diameter and material consumption under the ring stiffness. If you decide to introduce technology and equipment, should be placed on the investigation, for introducing the most advanced technology.

At present, many enterprises have developed a manufacturing winding pipe welding equipment, to reduce material consumption, easy connection, it is also done a lot to explore.

Development of large diameter plastic pipe needs a development procesipl lamp s, not too fast nor blind pursuit of plastic pipe in all areas and not within the scope instead of pipe and out the other, manufacturers should be strictly in accordance with international standards strict demands on themselves.

Barbaric construction of large diameter refused