Recently, China Purchasing and Bidding Network and China Famous Enterprise Ranking Network jointly released "Top Ten Brands of pe Pipe in China in 2020" and "Top Ten Brands of Double-wall Bellows in China in 2020", making annual evaluation on the development of plastic pipe enterprises in PE pipe and double-wall bellows market in 20 19, and applying big data technology, making an annual evaluation on the enterprise sales and winning the bid in 20 19. Since 2008, the evaluation and promotion activities of national plastic pipe manufacturers were first carried out from the perspective of bidding, the two networks have been held 12 times in succession. The fairness, professionalism and authority of the list have been widely praised by the industry, and more and more suppliers have been attracted to participate in the selection, which has aroused great concern from the society.
At the beginning of the use of plastic pipes, the amount of PE pipes was much less than that of PVC pipes. In recent years, with the progress of science and technology, high-performance pe pipes have come out, and in the process of research and development, a new generation of high-strength PE materials for pipes have emerged continuously. The upgrading of materials significantly improves the various stresses of PE pipes, and has the advantages of good toughness, corrosion resistance, high impact strength, high bearing capacity and long service life, which makes PE pipes widely used, especially water supply pipelines and gas pipelines. The PE pipe market is growing steadily. In 20 18, the output of PVC and PE pipes accounted for 46% and 30% respectively. With the wide application of PE double-walled corrugated pipes, this gap should be narrowed. Because of its large diameter, double-walled corrugated pipe has become the mainstream of drainage pipeline buried with plastic pipe. Thanks to the increasing investment in drainage projects and the upgrading of traditional buried pipes in China, the market has a good development prospect.
The Guiding Opinions on the 13th Five-Year Development Plan of Plastic Processing Industry clearly points out that large-diameter and high-strength polyolefin drainage pipes and sewage pipes are still scarce, and municipal construction needs large-diameter and high-strength rigid pipes. At present, one kind of double-walled corrugated pipe is all plastic production, including PVC-U double-walled corrugated pipe and HDPE double-walled corrugated pipe; The other is composite corrugated pipe, such as HDPE steel belt reinforced spiral corrugated pipe. The largest diameter of HDPE is larger than that of PVC-U. Under the market demand for large diameter, polyethylene double-walled corrugated pipe will be more widely used in buried drainage. The leading enterprises of PE pipeline and double-walled corrugated pipe manufacturers have already laid out their plans in the future competitive market.
Double-wall corrugated pipe has shown a good mechanism in the construction of sponge city and urban common ditch, and will certainly occupy an important position in the future development. At present, there are many kinds of double-walled bellows in China, but the quality and performance are uneven, and many low-quality enterprises are mixed among them. In order to meet the needs of market development, the state has issued corresponding standards to regulate the development of the industry.
The standard of PVC-U double-walled corrugated pipe mainly refers to GBT 18477 1-2007 "Rigid PVC-U Structural Wall Pipe System for Buried Drainage", which is suitable for pipes for municipal buried drainage, building drainage and farmland drainage without pressure, and can also be used for communication cable threading and buried industrial sewage pipes without pressure. After years of development, it is relatively stable. The latest standard of PE double-walled corrugated pipe is quite interesting. The new standard GB/T19472.1-20 19 polyethylene double-walled corrugated pipe was released in August 2019, and will be implemented in March 2020. This part is suitable for underground drainage, sewage discharge and communication with long-term use temperature below 45℃. Compared with the 2004 edition, the new standard has added a lot of contents, one of which is the increase of SN 10 grade, which is more in line with the actual market demand after revision; The regulations and requirements of minimum outer wall thickness of polyethylene double-walled corrugated pipe are added to meet the requirements of ring stiffness and ring flexibility of pipeline. The minimum wall thickness of the pipe socket shall not be less than 1.5 times of the minimum laminated wall thickness of the pipe. The physical and mechanical properties of polyethylene double-walled corrugated pipe require higher density, and the pipe density is limited to no more than 1 180kg/m3. This requirement can prevent illegal manufacturers from adding a lot of calcium powder and other ingredients to raw materials, cut corners and reach the standard of ring strength, but in fact, the upper ring has poor flexibility, low impact resistance and short service life, and it is shoddy in the market; In order to improve the service life of pipeline, the requirement of oxidation induction time in the physical and mechanical properties of polyethylene double-walled corrugated pipe is improved.
The new national standard of PE water supply pipe has been expanded from the original three parts to five parts, including general rules, pipes, fittings, valves and system applicability, and there have been many additions and changes in technical content. For example, the biggest change of pipeline standard is the increase of pipeline size and specification. In particular, the large diameter has been expanded from 1000mm to 1200mm, 1400mm, 1600mm, 1800mm, 2000mm, 2250mm and 2500mm, which are equivalent to international standards, but at present,
The introduction of the new standard is a blow to the industry's jerry-building and shoddy behavior. At present, there are many domestic pipeline enterprises with small caliber and low added value, but few enterprises with large caliber and high technology content. The introduction of new standards is also an option to help the industry survive the fittest. The "2020 12 China Pipeline and Pipe Bidding Evaluation Promotion Activity" jointly organized by China Procurement and Bidding Network and China Famous Enterprises Ranking Network is consistent with the state's desire to encourage the application of advanced technology, actively promote new processes, new materials and new equipment, and improve product quality. On the occasion of the implementation of the new national standard, the two networks solemnly released "Top Ten Brands of PE Pipe in China in 2020" and "Top Ten Brands of Double-wall Bellows in China in 2020" to help enterprises in the industry rebuild brand benchmarks, let the best of the past contribute to the healthy development of the standardization industry.