Selection and classification of water pipe materia

2022-07-22
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Qijia expert teaching: selection and classification of water pipe materials

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“ Concealed works ” The selection and installation of water pipes has become a problem that cannot be ignored in decoration. In order to make the room beautiful, people usually use the buried wall construction when decorating the water pipe. Once the water pipe leaks and bursts, it will bring irreparable consequences. In the past, cast iron pipes were mainly used for water supply. Sand mold cast iron pipes are mainly used outdoors, and galvanized cast iron pipes are used indoors, which can be divided into cold (electric) galvanizing and hot galvanizing. Galvanized pipe as a water pipe, after several years of use, a large number of rust scales are produced in the pipe. The yellow water not only pollutes the sanitary ware, but also is mixed with bacteria that breed on the unsmooth inner wall. Rust causes the content of heavy metals in the water to be too high, which seriously endangers human health

there are three main types of pipelines currently used

the first type is metal pipes, such as hot-plated cast iron pipes lined with plastic, copper pipes, stainless steel pipes, etc

the second type is plastic clad metal pipe, such as plastic clad steel pipe, aluminum plastic composite pipe, etc

the third type is plastic pipe, such as PP-R (cross-linked poly {todayhot} propylene high-density mesh engineering plastic). The state also stipulates that all kinds of pipes and fittings involving drinking water pipelines must be approved by the health department before they can be sold

(1) aluminum plastic composite pipe

aluminum plastic composite pipe is a popular pipe in the market. It is light, durable and convenient for construction. Its bendability is more suitable for home decoration. The main disadvantage is that when used as a hot water pipe, due to long-term thermal expansion and cold contraction, the ferrule connection may be misaligned and cause leakage

(2) PP-R pipe

as a new water pipe material, PP-R pipe has unique advantages. It is non-toxic, light, pressure resistant and corrosion-resistant. It is connected by a special hot-melt method, which will not corrode and rust, and PP-R pipe will not scale. It is becoming a popularized material

① Product Name: the product name of true PP-R should be “ Polypropylene pipe for cold and hot water or “ PP-R pipe for cold and hot water ”, Those with irregular names such as ultra-fine particle modified polypropylene pipe (PP-R) or PP-R cold water pipe, PP-R hot water pipe and pp-e pipe are pseudo PP-R pipes

② the density of pseudo PP-R is slightly higher than that of real pp-r

③ the true PP-R tube is white matte or other colored matte, and the pseudo PP-R tube is bright or colorful

④ the true PP-R tube is completely opaque, and the pseudo PP-R tube is slightly translucent or semi translucent

⑤ the real PP-R tube feels soft, while the pseudo PP-R tube feels smooth

⑥ the landing sound of real PP-R tube is dull, and the landing sound of pseudo PP-R tube is crisp

it should be noted that the service life of pseudo PP-R pipes is only 1-5 years, while the service life of real PP-R pipes is more than 50 years

(3) copper pipe

copper pipe has the advantages of corrosion resistance, sterilization and so on. It is a top-grade product in water pipes. There are two ways of copper pipe interface: ferrule and welding. Like the aluminum-plastic pipe, the ferrule has the problem of aging and water leakage for a long time, so most users who install copper pipes use welding, which means that the interface is welded together through oxygen, so that it can be the same as PP-R water pipe and never leak. One disadvantage of copper pipes is that they conduct heat quickly, so the hot water pipes produced by famous copper pipe manufacturers are covered with plastic and foaming agent to prevent heat dissipation. Another disadvantage of copper pipe is its high price

(4) stainless steel pipe

is a very expensive water pipe, which is difficult to construct and rarely used. Its performance is similar to that of copper pipe

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