PPR is an abbreviation for English Polypropylene-Random. Commonly known as three types of polypropylene. PPR pipe is a new generation of galvanized pipe, UPVC water supply pipe, aluminum plastic pipe, PE pipe, PE-X pipe, PE-RT pipe. Because it uses random copolymerization technology, the strength and high temperature resistance of polypropylene are well guaranteed, and thus become the main force of water pipe materials.
advantage
1. Health, health and environmental protection. Polypropylene is an environmentally friendly material that can be used for drinking water delivery.
2. The joint is made of hot-melt joint, which is one-piece, 100% non-leakage. Other materials are connected by wire mouth, which has poor anti-seepage property and avoids the toxicity of glue bonding.
3. The conveying resistance is small.
4, the price is moderate.
5, long service life, can be used for 50 years according to the national standard GB/T18742 production and use.
PPR is the abbreviation of tripropylene-polyethylene. It uses hot-melt joints and has special welding and cutting tools for high reliability. The price is also very economical. The insulation performance is also very good, the tube wall is also very smooth! The general price is 4-8 yuan per meter (4 points). Does not include joints for inner and outer wires.
The PPR pipe is officially called the random copolymer polypropylene pipe, which is the most widely used water supply pipe in the home improvement project.
Disadvantage
The main defects of PPR water pipes are: high temperature resistance and pressure resistance are slightly worse. The long-term working temperature cannot exceed 70 °C; each length is limited and cannot be bent. If the pipeline is laid for a long distance or there are many corners, during construction, A large number of joints are used; the pipes are cheap but the parts are relatively expensive. However, in terms of overall performance, the PPR pipe is a cost-effective pipe, so it has become the material of choice for the renovation of home improvement pipes.
Compared with other kinds of tubes: galvanized iron pipes have been banned in 2000 due to many shortcomings; aluminum-plastic pipes have good high temperature resistance and convenient construction, but they are used as hot water pipes due to long-term thermal expansion and cooling. The shrinkage will cause the pipe wall to be misaligned and cause leakage; the copper pipe is durable and environmentally friendly, but it has not been widely adopted due to high price and high construction requirements.
After using the PPR plastic water pipe for a period of time, the secondary pollution of the inner wall of the pipe is serious. It is the breeding ground for bacteria and Legionella, and it has become a new human health killer and a potential life threat. It is not suitable for household water pipes.
When the PPR plastic pipe began to promote tap water pipes in China in 2002, an unpublished inspection report by the Beijing Municipal Center for Disease Control and Prevention showed that the total number of bacteria in the water flowing out of household PPR water pipes was countless, and the Lungophilic Legion was detected. The number of bacteria type 1 and type 5 is shocking, exceeding the galvanized tube that has been banned. The results of the water quality tests by the relevant departments are as follows: up to 28 kinds of bacteria and 16 kinds of metal elements, of which iron, manganese, zinc, lead and mercury are seriously exceeded. PPR water pipes contain dirt and dirt, which is a breeding ground for bacteria to multiply. In the pipeline industry, the PPR tap water pipe is sampled on the inner wall of the pipe after a period of use. The test result is: a yellow rust containing microorganisms such as bacilli, cocci, and bacteria, a large amount of iron bacteria, Essil Escherichia coli Up to 31 species of gut bacteria, dwelling bacteria, Acinetobacter, Aeromonas, Arthrobacter, Bacillus, and at least 14 biotypes of Pseudomonas putida, and even found chlorine-tolerant microorganisms The breeding of the genus such as genus, genus, genus, genus, genus and genus. The concentration of heterotrophic bacteria, Escherichia coli, radiobacteria and fungi in the dirt on the inner wall of the tube is extremely high.
PPR plastic pipe itself is non-toxic and hygienic, but PPR plastic pipe has no self-cleaning function and kills bacteria. In the specific environment of domestic water, the pollution of water source, the backward process of water supply plant and the old and unreasonable pipe network are unreasonable. To make household PPR water pipes become a gathering place for secondary pollutants and bacterial growth, which is a serious threat to human health. A report on the health of some cities in China reveals that the increase in various diseases and cancers is related to the quality of household tap water. It is related to the wrong choice of water pipe material.
Therefore, experts recommend:
1) Replace the water pipe: The longer the PPR water pipe is used, the more "toxic" it is, or the regular flushing and disinfection of the old pipe.
2) Install pre-filter and kitchen water purifier in the old pipe line
3) Newly renovated household plumbing customers can learn from European and American countries, and install plastic copper pipes (slightly higher) or copper PPR pipes (medium price). Because copper has excellent sterilization and self-cleaning functions, it is most suitable for home use.
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