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In the past, pipes used for water supply were mainly cast iron pipes. Sand cast iron pipes are mainly used outdoors, and galvanized iron pipes are used indoors. They can be divided into cold (electric) galvanized and hot galvanized. The galvanized pipe is used as a water pipe. After a few years of use, a large amount of rust is generated in the pipe. The outflow of yellow water not only pollutes the sanitary ware, but also contains bacteria that grow on the rough inner wall. Corrosion causes excessive levels of heavy metals in the water and seriously harms human health. The state has stipulated that sand mold casting fittings and cold galvanized cast iron fittings should be eliminated from June 1, 2000. The use of hot-dip cast iron pipes should be gradually restricted, and aluminum-plastic composite pipes and new-type plastic pipes should be promoted. Therefore, there are three major categories of pipelines currently in use. The first category is metal pipes, such as hot-dip cast iron pipes, copper pipes, stainless steel pipes and so on. The second category is plastic compound metal pipes, such as plastic compound steel pipes and aluminum plastic composite pipes. The third category is plastic pipes, such as PP-R (cross-linked polypropylene high density mesh engineering plastics). →Related reading: How to choose water pipe for home decoration
The State also stipulates that various pipes and fittings involving drinking water pipelines must be approved by the Ministry of Health before they can be sold.
(1) Aluminum plastic composite pipe
Aluminum-plastic composite pipe is one of the more popular pipes in the market. It is light, durable, and convenient to construct. Its flexibility is more suitable for home use. The main drawback is that when used as a hot water pipe, due to long-term thermal expansion and contraction, it may cause misalignment of the snap-on connection and cause leakage. There are many varieties of aluminum-plastic composite tubes currently sold on the market, and the quality and price vary greatly. How to buy aluminum-plastic composite pipes has become a headache for consumers.
1 check the appearance of the product
The high quality aluminum composite pipe generally has a smooth outer wall. The logo, specifications, applicable temperature, and number of meters on the pipe wall are clearly identified. The manufacturer also prints the production number on the pipe wall so that the product quality can be monitored at any time; the product packaging is excellent and the packaging is excellent. All kinds of logos are also clear. Manufacturers' names, addresses, telephone numbers, etc. are all printed in prominent positions. The shoddy products generally have rough outer walls, unclear or incomplete labels, simple packaging, and unclear site or telephone calls.
2 aluminum layer can not be ignored
A good aluminum-plastic composite pipe is welded at the overlap of the aluminum layer, and the aluminum layer and the plastic layer are closely combined without stratification. The shoddy products have aluminum layers that are not welded, and some aluminum layers and plastic layers are often layered and not tight.
(2) PP-R tube
As a new type of water pipe material, PP-R pipe has unique advantages, it is non-toxic, light weight, pressure resistance, corrosion resistance, using a special hot melt connection, will not rust, and PP-R pipe is not Scale will become a popular material. Due to the relatively simple production process, there are a large number of counterfeit products on the market. To help owners identify the authenticity and feel of the PP-R pipe and pipe fittings, refer to the following points:
1 Product Name: The product name of True PP-R shall be "PP pipe for hot and cold water or "PP-R pipe for hot and cold water", where the ultra-fine particle modified polypropylene pipe (PP-R) or PP-R cold water pipe, PP-R hot water pipe, PP-E pipe and other informal names are pseudo PP-R pipe.
2 The density of pseudo PP-R is slightly larger than that of true PP-R.
3 True PP-R tube is matte white or other colors, pseudo PP-R tube shiny bright or colorful.
4 The true PP-R tube is completely opaque, and the pseudo PP-R tube is slightly translucent or semi-transparent.
5 The genuine PP-R tube feels soft and the fake PP-R tube feels smooth.
6 True PP-R pipe landing sound more dull, fake PP-R pipe landing sound more crisp.
It should be noted that the service life of the pseudo-PP-R pipe is only 1 to 5 years, and the service life of the real PP-R pipe is more than 50 years.
(3) Brass
The copper pipe has the advantages of corrosion resistance, sterilization, etc., and is a superior product in the water pipe. There are two types of copper pipe joints in the way of card socket and welding. Card sleeves, like aluminum-plastic tubes, suffer from long-term aging and leakage problems. Therefore, most of the users who install copper tubes use welding. Welding is the interface where oxygen is welded together. This can be the same as PP-R tubes. leakage. One of the disadvantages of copper tubes is their high thermal conductivity. Therefore, the hot water tubes produced by famous copper tube manufacturers are covered with plastics and foaming agents that prevent the heat from escaping. Another disadvantage of copper pipes is that they are expensive. There are very few residential water supply systems that are copper pipes. I am afraid that they will only be seen in export apartments and high-end villas. If you plan to change the water pipe and think that the copper pipe is good, it is recommended that you use a soldered connection.
(4) stainless steel tube
It is a very expensive water pipe. It is difficult to construct and is rarely used. Its performance is similar to that of copper pipes.
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