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Siphon Roof Drainage System, Why Use Special Drainage Pipe

Because in the siphon drainage system, drainage pipes used metal at the beginning. With the progress of technology, various new materials began to appear. Among all siphon drainage pipes, HDPE material is a little outstanding because of its light use, strong corrosion resistance and so on. It gradually replaces other drainage pipes and is widely used in various siphon drainage systems.


In life, we all have experience. If it rains outside, even if the sound insulation effect of the house is very good, the drain pipe will occasionally make a terrible grunt sound. This is using gravity drainage pipe. When the water volume is large enough, because of the gravity pressure, there will be a high pressure at the entrance of the drain pipe. The water can not go downhill, but can only carry a large amount of gas into the pipe. Bubbles with water flow will strongly rub against the wall of the pipe, resulting in a loud noise. At the same time, because the flow is constantly affected by the top pressure, the flow speed is extremely slow.

HDPE siphon drain pipe will not have this problem, in fact, as long as sponge piping engineers sell siphon drain PE pipe to customers, they will abandon the use of gravity drain pipe, because the gap is too obvious.

High density polyethylene PE pipes are generally used in siphon drainage pipes. The biggest difference between PE pipes and gravity drainage pipes is that when the drainage is in large flow, the unit drainage area of PE siphon drainage pipes is nearly 80% larger than that of gravity drainage pipes, and PE siphon drainage pipes do not need to make platform slopes.As long as the water level exceeds the cap line of siphon drainage, siphon phenomenon will occur. The nearby water source will be "sucked" into the drainage pipe, which can improve the drainage capacity. On the other hand, because the water entering the drainage pipe is sufficient, there is no gas doped in it. Therefore, turbulence will not occur when water flows. The formation of turbulence will lead to two evils. As a result, the first is that there will be tremendous noise and vibration in the pipeline.

The structure of HDPE siphon drainage pipe is not much different from that of gravity drainage pipe. The whole drainage system that runs through Shanghai is composed of rainwater bucket, rainwater suspension pipe, rainwater riser and rainwater buried pipe. The core of siphon drainage pipe is rainwater bucket. The rainwater bucket of PE siphon drainage pipe has good rectification function, and rainwater bucket is in its rated design discharge. In the submerged drainage state, there will be no problem of bubble infiltration.

The siphon drainage pipe has a small depth in front of the bucket, so the rainwater can easily submerge the drainage state of the main road. Therefore, the roof drainage system with the siphon drainage pipe is equivalent to installing a stable pump on the roof, continuously pumping the water from the top into the drainage pipe, and the drainage pipe from the drainage pipe is full of pressure flow state.

Because the water intake of siphon drainage pipe in sponge drainage system is small, even if the rainfall is not large, it will still produce vacuum siphon effect. Only when the rainfall is very small, because the air infiltrates into the rainwater bucket and the vacuum in the drainage pipe is destroyed, the drainage system will change from the siphon state to the gravity flow state. At this time, the working condition of the siphon and gravity drainage pipe will change from the siphon state to the gravity flow state. Same as pipes.





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