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PE water pipe

Product number: 201712120902015735
Place of Origin: China - Shandong - Zibo
Reference Price:
Unit:Metre
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Product Details

PE (polyethylene) material is widely used in the field of water supply pipe due to its high strength, corrosion resistance and non-toxicity. Because it does not rust, it is the ideal pipe to replace ordinary iron pipe. PE pipe to implement the product national standard: GB / T 13663-2000 "water supply polyethylene (PE) pipe."

Folding corrosion resistance:

(1) Polyethylene has excellent corrosion resistance, good hygienic properties and long service life:

Polyethylene is an inert material, in addition to a small amount of strong oxidants, resistant to a variety of chemical erosion, and not easy to breed bacteria. It is well known that the reason that steel pipes and cast iron pipes are replaced by plastic pipes is not only because plastic pipes have lower energy consumption, lower energy consumption, lighter weight, Flow resistance is small, quick and easy installation, low cost, long life, with thermal insulation, etc., but also because of plastic pipe corrosion-resistant, difficult to breed microorganisms and other properties superior to steel and cast iron pipe.

 The life of polyethylene pipes for more than 50 years, it has been recognized not only as a number of international standards and foreign advanced standards, and has been proven in practice.

Another reason that polyethylene can be used more widely is because of the growing pressure on the environment for PVC. The first is the health performance of PVC itself: As we all know, in the formal production and strict control of the production of PVC pipe can ensure hygienic performance, allowing the application in the field of drinking water. However, there are still some people who worry that problems may occur in places where the control is inadequate: if PVC monomer in the PVC resin exceeds the standard, toxic additives are mistakenly used in the PVC pipe for water supply. The PVC pipes and fittings that do not guarantee non-toxic drainage are mistakenly used for water supply pipes and fittings. Followed by the recycling of polyvinyl chloride pipe: PVC and polyethylene are the same as the thermoplastic, in theory, can be used, but the countries have proved that the old plastic products can be recycled a limited percentage, The main treatment is incineration energy recovery, PVC because of chlorine, incineration can produce harmful substances in poor control, and polyethylene only contains hydrocarbons, water and carbon dioxide after burning.

 

Folding flexibility:

Polyethylene has unique flexibility and excellent scratch resistance

The flexibility of polyethylene pipe systems has enormous technical and economic value. The flexibility of polyethylene is an important property that greatly increases the value of this material for pipeline engineering. Good flexibility allows the polyethylene pipe can be coiled, to supply a longer length, to avoid a large number of joints and fittings. For example, in the national urban water diversion demonstration unit - Nantong Water Company in the selection of a table to take full advantage of the PE small-diameter pipe coil characteristics, from the meter to the user a pipe in the end, There is no need for pipe joints in the middle, which not only saves costs but also improves work efficiency. This characteristic of PE small-diameter pipe has been recognized by tap water companies that have water meters in all the cities of the country and become the first choice of their water-changing operations. At the same time, it is flexible and lightweight, and has excellent scratch resistance, making it possible to use a variety of cost-effective mounting methods that reduce the impact on the environment and society, such as trenchless construction techniques. Excavation construction technology refers to the use of all kinds of rock drilling technical means, laying on the surface without ditching (trough),replacement or repair of various underground pipeline construction technology. A variety of excavation-free construction technology is very suitable for polyethylene pipe, such as horizontal directional drilling and pilot drilling of new pipelines, expansion of old pipelines in place to replace the old method of pipelines and repair of the old pipeline interspersed with the lining method and a variety of improved lining method (folding deformation method, hot-drawing method and cold-rolled method).

PE's unique flexibility also makes it effective against underground movement and end loads. On the surface, the strength and rigidity, the plastic pipe buried pipe and metal pipe than the less, but from the practical point of view, plastic pipe is buried under the "flexible pipe", the correct design and laying of plastic buried pipe is And the surrounding soil to bear the load.

So the plastic buried pipe does not need to reach the same strength and rigidity of "steel pipe" to meet the mechanical performance requirements in the buried use. At the same time, the pressure relaxation characteristics of polyethylene can effectively strain through the stress, the actual axial stress level is far lower than the theoretical value, and the elongation at break is generally greater than 500%, bending radius can be as small as 20 to 25 times the tube diameter. It is a highly ductile material with very good adaptability to uneven subsidence of the foundation. These features make it the best pipeline to withstand earthquakes, settlement and temperature expansion. For example, in 1995 Japan's Kobe earthquake, PE pipe and gas pipe is the only surviving pipeline system.

Folding low temperature:

Polyethylene has a very outstanding low temperature resistance

PE pipe low temperature embrittlement point of -70 , better than other pipelines. PVC-U pipes are easy to be brittle in the field construction in winter. One of the experiences summarized in the pilot project of laying PVC pipes in Beijing in China is that it is unfit for the temperature to be below zero Polyvinyl chloride (PVC-U) pipe laying construction. There is also a clear evidence to improve the toughness of PP and low temperature impact resistance, ethylene and propylene monomer can be copolymerized into random copolymer polypropylene (PP-R), which generally uses iPP process routes and methods, Copolymerization of a mixed gas of propylene and ethylene gives a copolymer in which propylene and ethylene segments are randomly distributed in the main chain (ie, PP-R pipe material), and the ethylene content in the PP-R pipe material is mostly about 3% . But the improved PP-R low temperature performance is still unsatisfactory, the embrittlement point is about -15 , much higher than the polyethylene pipe embrittlement point temperature -70 .

Folding fracture toughness:

Polyethylene has good fast crack growth fracture toughness

When rapid crack growth damage occurs, cracks can be 100 ~ 45m / s speed rapid expansion of a few hundred meters to more than ten kilometers, resulting in long-distance pipeline damage, a large-scale spill occurred. As well as subsequent combustion and explosion (natural gas) or flood (water) accidents . The probability of such an accident is not big, if it happens, it is extremely harmful. For the continuous development of plastic pressure pipe, the importance of preventing the requirement of rapid crack growth damage has exceeded the requirements of long-term life strength performance. The reason is: in the same SDR (pipe diameter and thickness ratio),long-term life calculated - long-term strength has nothing to do with increasing tube diameter (in fact, larger tubes may be safer than smaller tubes) ;However, the risk of rapid crack growth increases with increasing tube diameter. In the existing large variety of plastic test methods of material pipe, such as polyethylene, polypropylene, PVC pipe, etc., to a certain diameter, by the rapid crack growth prevention to prevent the allowable pressure is always higher than the long-term strength The pressure on the issue is low. In other words,

The requirements of long-term life (eg, 20 ° C, 50 years) are self-fulfilled, as determined by the requirement to prevent rapid crack growth damage; the rapid crack growth material with poor fracture toughness will be eliminated, regardless of its long-term strength properties Good or bad. Polyvinyl chloride (PVC-U) gas pipes have basically been replaced by Polyethylene (PE) gas pipes. The trend for PVC-U pipes to be replaced by polyethylene (PE) pipes has become clear.

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