HDPE Siphon Pipe

HDPE siphon pipes are generally black. Siphon drainage, also known as roof siphon rainwater drainage system, forms a full pipe flow when there is no slope in the horizontal pipe, and drains the accumulated water on the roof at a very fast speed.

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HDPE Siphon Pipe Manufacturer in China

The inner and outer surfaces of HDPE siphon pipes and fittings should be clean and smooth, without any defects such as bubbles, obvious scratches, dents, impurities and color. The pipe ends should be cut flat and perpendicular to the axis.

‌Our HDPE siphon pipes are made from 100% virgin material, featuring smooth inner and outer surfaces, high temperature resistance, high pressure resistance, and negative pressure drainage. Horizontal pipes require no slope, saving space and improving drainage efficiency. They are suitable for municipal engineering, transportation/road and bridge construction, large factories, exhibition halls, gymnasiums, and high-speed rail station drainage projects.

HDPE Siphon Pipe

HDPE Siphon Pipe

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HDPE Siphon Pipe

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HDPE Siphon Pipe

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HDPE Siphon Pipe Sizes & Specifications

Siphon Drainage Principle

The core of a siphonic drainage system is to utilize the pressure differential of liquids within a sealed pipe to achieve automatic drainage.

When the rooftop rainwater level exceeds the height of the gutter, a specially designed anti-vortex gutter controls the flow rate of rainwater entering the gutter, adjusts the flow pattern, and reduces vortices. This, in turn, reduces the amount of air entrained by rainwater entering the system, allowing the drainage pipe to remain full. By leveraging the height of the building roof and the potential energy of the rainwater, a siphonic effect is created as the rainwater continuously flows through the rainwater suspension pipe and into the rainwater riser.

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Advantages of HDPE Siphon Pipes

High drainage efficiency: The siphon effect significantly increases water flow speed, making drainage efficiency 35 times higher than traditional gravity drainage. Even in heavy rain, rainwater can be quickly drained from the roof.
Save space and cost: Due to the large discharge volume of siphonic drainage pipes, the diameter of the drainage pipes using the siphonic drainage system is usually smaller than that of the gravity drainage system, and the diameter can be reduced by 30%-50%. For example, if the gravity drainage pipe is DN110, the diameter can be DN75 when using siphonic drainage. The overall length of the siphonic drainage pipe is shorter, the installation is relatively simple, and the pipe cost and installation fee are relatively low.
Flexible layout: The rainwater gutter can be flexibly arranged according to the actual situation of the roof to adapt to different types of roofs, and the rainwater suspension pipe can be laid without slope.
Easy maintenance: The system’s unique self-cleaning design significantly reduces the risk of clogging. The high water velocity in the system allows for excellent self-cleaning.
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HUALIN HDPE Siphon Pipe Applications Explored

HDPE siphon pipes are mainly used for draining rainwater and snowwater from building roofs. They achieve rapid drainage through the siphon principle and prevent water accumulation and leakage. Municipal Engineering: Suitable for urban road drainage, park and scenic area drainage, and other scenarios, supporting large-flow drainage needs. Environmental Engineering: Used for hillside development, slope soil and water conservation, and underground drainage system construction.

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