The PP-R piping system is an important part of the buil […]
The PP-R piping system is an important part of the building's hot and cold water piping system. At one time, there was a boom in the promotion of PP-R plastic pipe systems in China, but unfortunately, due to the interference of counterfeit and shoddy products and substandard products, the market of PP-R pipes has not been well developed continuously, but instead it has been left to the market. The bad impression that "plastic pipes are not durable" has led to the loss of confidence in the plastic pipes by many architects, developers and users of water supply piping systems. From a technical point of view, there are many reasons for the damage of unqualified products. On the one hand, there is no use of qualified raw materials. In the early stage of the development of plastic pipes, practitioners have not fully understood the long-term performance and strength of raw materials, and the understanding of raw material evaluation methods is not profound enough. On the other hand, the connection of the system is problematic. Because the modulus of the PP-R tube is relatively large in the plastic hose, the joint is prone to excessive stress. Especially when the steel-plastic transition joint is in the hot and cold water circulation for a period of time, it will frequently seep. Leakage situation.
Corrosion causes the metal to form an oxide film on the surface after reacting with oxygen in the atmosphere. The iron oxide formed on the ordinary carbon steel continues to be oxidized, so that the rust is continuously enlarged, and finally a hole is formed. The carbon steel surface can be ensured by electroplating with paint or oxidation resistant metals (e.g., zinc, nickel, and chromium), but as is known, this protection is only a film. If the protective layer is destroyed, the underlying steel begins to rust.
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