In general resin production, PVC resin has the lowest ethylene consumption and the lowest production cost. The domestic production of PVC per ton of ethylene is 0.5314 tons, while the average ethylene consumption per ton of polyethylene is 1.042 tons. The consumption of ethylene per ton of PVC resin per ton is less than 50% less than that of polyethylene. The production of chlorine used in PVC is an important way to balance the production of caustic soda to produce chlorine. Caustic soda is a very important raw material for the national economy. In addition, from the perspective of plastic products, PVC has good compatibility with various auxiliaries, and a large number of cheap fillers can be added to the production pipes, which greatly reduces the production cost.
Compared with metal pipe, PVC pipe and metal pipe, production per cubic meter of PVC and production per cubic meter of steel and aluminum calculation, the energy consumption of steel is 316KJ/m3, the energy consumption of aluminum is 619KJ/m3, the energy consumption of PVC is 70KJ/m3, that is, the energy consumption of steel is 4.5 times of PVC, and the energy consumption of aluminum is 8.8 times that of PVC. The energy consumption of producing PVC pipe is only 1/3 of the same caliber metal pipe. At the same time, because the PVC tube wall is smooth, does not corrode the tumor, the water delivery efficiency is high, for the infusion can save electricity about 20%.
PVC pipe has good mechanical properties, and has excellent corrosion resistance. It has light weight, easy installation and no maintenance in the process of use. In the process of using steel as a utility pipeline, the coating must be often coated and the maintenance cost is high because of easy corrosion. For general construction and utility engineering, metal pipes need to be replaced in about 20 years, and the well functioning PVC pipes will last for 50 years. Therefore, PVC pipe is a good plastic product with low production cost, high strength and corrosion resistance.
Generally speaking, in the aspects of sewage, waste water and ventilation pipe, the PVC pipeline saves about 16-37% of installation and labor cost than using cast iron pipe; it saves 30-33% for the use of metal wire bushing for traverse tube; and the effect of chlorinated polyvinyl chloride (PVC) tube in cold and hot water is 23-44% compared to the cost of copper tube with the same size as using the same size. Therefore, due to the advantages of PVC pipes, all countries are actively developing and promoting PVC pipes.