Aluminum alloy lined plastic pipe and PPR pipe are commonly used waterway transformation pipes in households, which are especially suitable for cold and hot water supply. They have excellent physical and chemical properties. Therefore, the two pipes not only have strong impact resistance, but also have the characteristics of corrosion resistance and oxidation resistance. It is an ideal household plumbing. So, in addition to the common points of the forehead, what are the advantages of aluminum alloy compared to PPR tube? What are the disadvantages?
1. Advantages
1. Long service life
The PE plastic used in the aluminum alloy lined plastic pipe is relatively stable in the molecular chain structure (-CH2-CH2-) in the plastic. The aluminum layer in the middle of the aluminum alloy lined plastic pipe separates the inner and outer layers, so enough stabilizers can be added to the outer plastic. To resist light and oxygen aging without affecting the internal hygiene of the contact number, thereby enhancing the anti-aging performance.
2. Hygienic performance
The aluminum alloy lined plastic pipe is made of special polyethylene material inside and outside, which is clean and non-toxic. The important thing is that the middle layer of the aluminum-plastic pipe is aluminum, which can not only cut off light, but also cut off oxygen.
3. Good resistance to cold and heat
The long-term use temperature is 95 degrees (50 years, 1MPa), the high use temperature is 135 degrees, and the thermal expansion coefficient of aluminum-plastic pipe is small. Similar to the thermal expansion coefficient of aluminum, it is only one-sixth of the entire plastic pipe. As the temperature changes, the amount of deformation is small. The aluminum alloy lined plastic pipe is a flexible coil, and the pipe itself can absorb a certain degree of deformation without causing thermal expansion and deformation of the piping system.
2. Disadvantages
1. Construction is not easy
The operation is inconvenient, and the construction of non-professional training institutes is prone to water leakage accidents.
2. High cost
A drainage system using stainless steel partitions requires a large number of pipes to be laid. The price of a pipe of the same specification is 1.5 times that of a PPR pipe, and the price of a pipe of the same specification is 2 to 10 times that of a PPR pipe fitting, which is expensive.
3. Small endoscopy
The tube endoscopes in each branch are small, and hot water cannot be used in the dry season.
4. Maintenance issues
Equipped with a special stainless steel slitting machine, more water leakage points. The threaded interface that wraps the water with a raw material tape is a potential leaking point. A complete stainless steel diverter has at least 10 leaking points, and future maintenance will be very troublesome.
5. Easy to leak
During construction, the metal pipe fittings and plastic pipes are pressed together. Due to long-term thermal expansion and contraction, the expansion coefficients of the two materials are different. The waterproof silicone ring rapidly ages and cannot prevent water after losing its elasticity. Partial deformation of the compression pipe may cause leakage.
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