Differences between HDPE double-wall corrugated pipes and PVC double-wall corrugated pipes

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This post was last edited by hjztbwg on 2015-10-19 at 13:54. I. PVC-U double-wall corrugated pipe: The UPVC double-wall corrugated pipe, also known as PVC-U double-wall corrugated pipe, is a special type of pipe manufactured using polyvinyl chloride as the main raw material; it features a smooth inner wall, a corrugated outer wall, and hollow interiors and exteriors. This pipe has an attractive appearance, a unique structure, high strength, a smooth inner surface, low frictional resistance, and high flow capacity. No concrete foundation is required; it is lightweight, easy to handle and install, and allows for rapid construction ； Rubber ring socket connection – a reliable method with easy assurance of construction quality ； Flexible interface. Strong resistance to uneven settlement ； It has excellent leak resistance and can withstand the erosion of various chemical agents ； No scaling occurs inside the pipe, virtually no cleaning is required, and its service life when buried can exceed 50 years. Physical properties: Parameter indicators – Connection seal test: No cracking or leakage. Impact test: TIR ≤ 10%. Ring stiffness: S1 ≥ 4 KN/㎡, S2 ≥ 8 KN/㎡. Ring flexibility: No cracking, and the two walls do not separate. Oven test: No splitting, cracking, or bubbles. Manning roughness coefficient: n = 0.010. Application areas: 1. Municipal engineering. It can be used for drainage and sewage pipes, as well as in construction projects. Used for building rainwater pipes, underground drainage pipes, sewage pipes, ventilation pipes, etc. 3. Electrical and telecommunications engineering. Can be used as protective sleeves for various power cables, as well as for railway and road communications. Used as protective tubes for communication cables and optical fibers, 5, industry. PVC double-wall corrugated pipes are widely used as sewage pipes in industries such as chemicals, pharmaceuticals, and environmental protection, as well as in agricultural and garden engineering projects. Used for irrigation and drainage in farmlands, orchards, tea plantations, and forest belts; 7. Road construction. PVC double-wall corrugated pipes are used as seepage and drainage pipes for railways, highways, and mines. PVC double-wall corrugated pipes can be used for mine ventilation as well as for water supply and drainage. II. Overview of HDPE double-wall corrugated pipes: HDPE double-wall corrugated pipes, also known as polyethylene double-wall corrugated pipes, are a new type of lightweight pipe made from high-density polyethylene. They feature low weight, high pressure resistance, good toughness, fast installation speed, and a long service life. Thanks to their excellent pipe wall design, their cost is lower compared to pipes with other structural designs. Moreover, due to its convenient and reliable connection, it is widely used both domestically and internationally. It replaces a large number of concrete pipes and cast iron pipes. Performance features: HDPE double-wall corrugated pipes possess excellent chemical stability, resistance to aging, and resistance to environmental stress cracking. The HDPE double-wall corrugated pipe produced from it as raw material is a flexible pipe. Its key properties are as follows: Strong resistance to external pressure: The outer wall has a ring-shaped corrugated structure, which **increases the ring stiffness of the pipe, thereby enhancing its ability to withstand soil loads. In this regard, HDPE double-wall corrugated pipes have a clear advantage over other types of pipes. Low cost: Under equal load conditions, HDPE double-wall corrugated pipes require only a thin wall thickness to meet the requirements. Therefore, compared to solid-wall pipes of the same material specification, it can save about half of the raw materials, so the cost of HDPE double-wall corrugated pipes is also lower. This is another prominent feature of this pipe material. Easy construction: Due to the light weight of HDPE double-wall corrugated pipes, they are easy to handle and connect, resulting in fast construction and simple maintenance. Its advantages become even more apparent under tight deadlines and poor construction conditions. Good low-temperature resistance and impact resistance: The embrittlement temperature of HDPE double-wall corrugated pipes is -70°C. Generally, no special protective measures are required when working at low temperatures (above -30°C); construction in winter is convenient, and HDPE double-wall corrugated pipes have good impact resistance. Good chemical stability: Due to the non-polar nature of HDPE molecules, it possesses excellent chemical stability. With the exception of a few strong oxidizers, most chemical media have no destructive effect on it. The soil, electricity, and pH levels in typical operating environments will not cause damage to this pipeline; it does not allow bacteria to grow nor does it form scale, and its flow area does not decrease over time as it is in use. Long service life: Under conditions free from sunlight and ultraviolet rays, HDPE double-wall corrugated pipes can last for over 50 years. Excellent wear resistance: Tests conducted in Germany have shown that the wear resistance of HDPE is several times higher than that of steel pipes. Appropriate deflection: HDPE double-wall corrugated pipes of a certain length can bend slightly axially, remaining unaffected by moderate uneven settlement of the ground; they can therefore be laid directly in slightly irregular trenches without the need for fittings. Advantages: 1. Unique structure with high strength; resistant to impact and compression; the walls are smooth, resulting in minimal friction during flow ； Joint sealing for convenient communication, with no leaks. 2. Light weight, fast construction speed, low operating costs, and even lower expenses. 3. Polyolefin polymer molecules can remain in highly acidic and alkaline underground environments for over 5 years; they are green, non-toxic, non-corrosive, and do not cause scaling. 4. Light weight, fast construction, and reduced costs. 5. The service life when buried is over fifty years.