Â° Passed from the new building water supply pipe PP-R plastic pipe PP*R pipe, that is, the three-type polypropylene pipe, which was first put into use in Europe in the late 1980s. Since the material is randomly connected to a certain amount of ethylene molecules during the synthesis process, the properties of the low-temperature impact resistance, long-term heat resistance and pressure resistance, and environmental stress cracking of the polypropylene are greatly improved; and, unlike other plastic tubes, The waste generated in the process of production, processing and use can be reused and will not pose a threat to humans and the environment. It is a true green product and has been widely accepted and valued internationally.
Compared with galvanized pipe, PP*R pipe has the following advantages: a. light weight, volumetric quality is only 1/8 of steel pipe, energy consumption in production process is only 20% of steel pipe. b sanitary, fully in line with drinking water Hygienic requirements for conveying materials have been used in Shenzhen and other places as a dedicated conveying pipeline for pure drinking water. c. Corrosion resistant. d. No scaling, the design flow rate can be increased by 30% than the same specification steel pipe. Heat resistance, can be used continuously for more than 50 years at 70*C, the maximum service temperature is 95 * C, instantaneously can reach 110*Cf insulation, thermal conductivity is 0 .WAm-K) is only 1/200 of the steel pipe. Generally, no heat preservation material is required outside the pipe when conveying hot water. g. Withstand pressure, depending on the application, you can choose a water pressure of 1~2MPa. h. Sound insulation performance is good. i. Long service life, up to 50 years. j. Use hot melt connection, never leak. k. Easy to repair.
Compared with plastic pipes, PP*R pipes have the following advantages: 1 excellent leakproofness; 2 combined use of hot and cold water; 3 pipe fittings are inexpensive.
According to the mechanical properties and long-term strength of PP*R materials, this material is suitable for small-diameter pipes with a diameter of 110mm or less. In some cases, 160mm pipe diameter can also be used. For PP pipes with large diameter pipes, the pipe wall is too thick and the economy is not good. Therefore, looking at the PP*R pipelines in various countries of the world, the common outer diameter range is less than 0110mm, and the commonly used nominal pressure grades are 1.0, 1.25, 1.6 and 2MPa, of which 1.0MPa is often recommended for cold water pipelines and various industrial pipelines, 2.0 The MPa grade is often used in hot water pipes.
It has been able to produce PP*R pipe, its performance and price ratio is high, the comprehensive cost of the project is the same as that of the galvanized pipe, far lower than the copper pipe, and it has the conditions for large-scale promotion and application.
(Provided by Chen Guogui of Linhai Weixing New Building Materials Co., Ltd.)
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