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Development course of water supply pipe material

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The first generation: galvanized pipe

Galvanized pipe is one of the pipes that have been put into use earlier. It is welcomed by everyone because of its low cost. However, it is easy to rust and block the pipes and cause serious pollution to the drinking water in life, which seriously endangers the health of the people. Therefore, it is natural to prohibit the use.

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Second generation: PVC pipe

PVC-U water supply pipe is one of the earlier pipes used to replace galvanized steel pipes. It has the advantages of good flame retardancy and low price. However, due to adhesive bonding, the connection reliability is poor, the pressure resistance is small, and it is not suitable for conveying hot water. What is difficult to ensure is hygiene. This is because the adhesive and PVC-U contain chlorine. Although it has been modified, it will slowly release chlorine in the process of changing external conditions, thus affecting water quality.

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Third generation: aluminum-plastic composite pipe

Aluminum-plastic composite pipe has good sanitary performance that galvanized pipe and PVC-U pipe do not have. It is composed of a layer of aluminum tape sandwiched between two layers of plastic inside and outside. The bonding force between aluminum layer and plastic, especially cross-linked polyethylene layer, is weak, which makes aluminum-plastic pipe easy to cause delamination and damage when used in hot water pipeline system. As aluminum-plastic composite pipe cannot be connected by hot melting, it can only be connected by clamping metal splicing, and aluminum-plastic composite pipe, in fact, it is caused by the inconsistency of the thermal expansion coefficient of the connecting material.

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The fourth generation: PPR pipe

The fourth generation of PPR pipe is a new generation of green pipe products produced by introducing foreign technology and raw materials in the mid -1990 s. However, PPR pipe also has the disadvantages of low temperature brittleness and excessive expansion coefficient. Moreover, PPR pipe scale storage and contamination is a hotbed for a large number of bacteria. The sampling and detection results of dirt on the inner wall of PPR pipe after being used for a period of time in the pipeline industry are as follows: a yellow rust tumor, containing as many as many as 50 species.

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The fifth generation: copper pipe

Copper tube also has a series of advantages such as small flow resistance, heat resistance, freezing resistance, pressure resistance, and no radiation aging. At the same time, the cost is also high, and the welding skill requirements are high. At the same time, the expansion force of copper is very large, and a special expansion elimination device needs to be set up. Copper pipes will produce over-standard patina when they are prohibited for more than 4 hours. The patina is toxic and can be used as insecticide. It has convergent stimulation and sulfuric acid corrosion effect on mucous membrane in human body, strong stimulation effect on intestinal tract, and can cause reflex vomiting (copper in drinking water shall not be more than 2mg/L but more than 3mg/L peculiar smell in water for human health). Take measures: when the water pipe is stationary for more than 4 hours or more, vent 10L of water before use.

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The sixth generation: thin-walled stainless steel water pipe

The thin-walled stainless steel water pipe embodies high technology and high quality. It is a quality product. The pure stainless steel water pipe system can be maintenance-free for 70 years. The price reflects the consumption level of maintaining long-term benefits equivalent. It is the secondary water supply of the water system and the residential area. And the recommended products for important projects are also a reliable choice for citizens who pay more and more attention to the quality of drinking water. The real value for money allows you to benefit from one investment for life. Stainless steel water pipes are connected by advanced clamping type pipe fittings. Special tools are used for clamping once at the construction site. There is no high-temperature open flame at the construction site, no residue in the pipe, and no water barrier. It is a simple and advanced connection method.