1 PVC pipe advantage In general-purpose resin production, PVC resin consumes the lowest amount of ethylene and has the lowest production cost. Domestic production of PVC per ton of PVC requires 0.5314 tons, while the average consumption of ethylene per ton of polyethylene is 1.042 tons. The domestic consumption per ton of PVC resin is about 50% less than that of polyethylene. The production of chlorine, a raw material for PVC, is an important way to balance the production of chlorine by caustic soda. It is an essential raw material for the national economy. In addition, from the perspective of plastic products, PVC has good compatibility with various additives, and a large amount of low-cost filler can be added in the production pipe, which greatly reduces the production cost. Compared with metal pipes, the production of PVC per cubic meter of PVC and the production of steel and aluminum per cubic meter, the energy consumption of steel is 316KJ/m3, the energy consumption of aluminum is 619KJ/m3, and the energy consumption of PVC is 70KJ/m3. That is, the energy consumption of steel is 4.5 times that of PVC, and the energy consumption of aluminum is 8.8 times that of PVC. The energy consumption for the production of PVC pipes is only one-third that of the same-diameter metal pipes. At the same time, because the PVC pipe wall is smooth, no corrosion is formed, the water delivery efficiency is high, and the infusion can save about 20% of electricity. PVC pipe has good mechanical properties, and has excellent corrosion resistance. It is light in weight, easy to install, and requires no maintenance. Steel pipes used for public works are corroded and must be corroded during use. Coatings are often applied and maintenance costs are high. The metal pipes for general construction and public works need to be replaced in about 20 years, and the PVC pipes with good processing capacity have a service life of 50 years. Therefore, PVC pipe is a good plastic product with low production cost, high strength and corrosion resistance. 2, the application of PVC pipe Generally speaking, in terms of sewage, waste water and ventilation pipes, PVC pipes save about 16-37% of the installation and labor costs compared with the use of cast iron pipes; the cost of the conduits is 30-33% less than the use of metal wire casings; Polyvinyl chloride (PVC) pipes are 23-44% more expensive in terms of hot and cold water than copper pipes of the same size. Therefore, due to the advantages of PVC pipe, all countries are actively developing and promoting PVC pipe. In developed countries, PVC pipe consumption generally accounts for 70-80% of the plastic pipe market, while China's PVC pipe only accounts for about 50% of the total plastic pipe. The development potential of PVC pipe in China is very huge. The consumption ratio of various PVC pipes in developed countries is: water supply pipe accounts for 33%, sewer pipe accounts for 22.3%, sewage pipe accounts for 15.7%, irrigation pipe accounts for 5.2%, gas pipe accounts for 0.8%, and other pipes account for 22.7%. The ratio of pipe to pipe consumption is about 1:8. In the construction market, there are two types of PVC pipes used: one is a pressure pipe and the other is a pressureless pipe. Cast iron pipes and copper pipes generally used in the past are used as pressure-resistant building materials, which are not only highly corrosive, but also require frequent maintenance and replacement, and are costly. Most of the buildings in foreign countries now use pressure-resistant water pipes, and hot water supply pipes mostly use PVC pipes. Small diameter PVC pipe (UPVC pipe, CPVC pipe) has the advantages of low cost, corrosion resistance, no need for frequent maintenance and replacement. Large-diameter PVC pressure-resistant pipes (100-900mm in diameter) replace cast iron pipes and strengthen small mud pipes. The water supply system has good fluidity, corrosion resistance and low weight. Energy saving and good water quality. The PVC core foaming pressureless pipe is used as the indoor water pipe and the rainwater system pipe, which can well solve the noise problem of the indoor water pipe. The utility sewage pipe adopts non-pressure PVC pipe, has corrosion resistance, is not eroded by hydrogen sulfide, has long service life, light weight, low installation cost, easy connection and sealing, and is not easy to be broken. In addition, construction string pipes and underground cable protection pipes are also another market for PVC pipes. Currently, the varieties used in China are straight pipe, double wall pipe and single wall corrugated pipe. Agricultural tubing is another broad area of ​​PVC applications. China is a country with water shortages. At present, most of China's farmland is still irrigated with earth canals, and water waste is very serious. Due to lack of water, a large amount of cultivated land is not well irrigated and crop yields are low. The use of PVC pipe for irrigation can save about 50% of water. The use of PVC fixed or semi-fixed irrigation systems for planting not only saves water, but also increases production, equipment does not corrode, etc., greatly saving the cost of irrigation facilities. At present, there is still no county in China that is fully managed, and most areas of the country lack basic understanding of tube irrigation. Therefore, the promotion and promotion of PVC pipe irrigation in rural areas has great potential. 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