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  4. What is the current status of China's PE...

What is the current status of China's PE winding tube market

What is the current status of China's PE winding tube market

What is the current situation of China's PE winding pipe market? According to what I know, PE winding pipe with polyethylene winding structure has the characteristics of light weight, low roughness of the inner wall of the pipe, and large water transfer volume with the same pipe diameter. The replacement products of cement substitutes have been widely used abroad. Over the past few years, they have been widely used in municipal drainage, outdoor construction drainage, industrial drainage and other fields. So what is the current situation of China's PE winding tube market, what are the main points of PE winding tube design? Let's take a look together.

What is the current status of China's PE winding tube market

What is the current status of the Chinese PE winding tube market:

China began to introduce pe-winding pipe equipment production in the 1980s. In recent years, the production scale has begun to expand and the rapid development of application; at the same time, with the development of domestic large-diameter polyethylene buried drainage structure wall pipes, some manufacturers have formed large-scale production ability.

The buried drainage pipeline system is generally a gravity flow system, which does not require high internal pressure resistance, but has a high requirement for external load capacity (ring stiffness). At the same time, the two structural wall pipes included in this product standard are suitable for buried drainage, buried farmland drainage and other projects with long-term temperature below 45 ℃; after considering the chemical resistance of the material, they can also be used for industrial drainage and sewage pipeline. PE winding tube can also be used as a communication sleeve.

GB / T19472.1 stipulates a structural form of PE winding tube; according to the actual production situation in China at that time, GB / T19472.2 stipulates two types of structural forms, Type A: with flat inner and outer surfaces, inner and outer walls Pipes connected by internal spiral ribs, or smooth inner surfaces, flat outer surfaces, and spiral hollow tubes buried in the pipe wall; Type B: smooth inner surfaces, the outer surface is hollow spiral ribs. Structured winding pipe.

What are the main points of PE winding tube design:

1) Pipes and fittings are suitable for buried drainage, buried farmland drainage and other projects with long-term temperature below 45 ℃.

2) The buried plastic drainage pipe should be designed according to the theory of flexible pipe (the pipe and soil work together). At the same time, in the design state, the vertical change of the pipeline shall not be greater than 5% of the pipe diameter.

3) The selection of pipe ring stiffness is an important index for the design of plastic pipes. Therefore, it should be determined from the comprehensive consideration of the buried depth of the pipe, the ground load, the nature and compaction coefficient of the trench backfill, and the construction load. It is uneconomical to blindly adopt high ring stiffness. For pipelines with a buried depth of less than 1.0m under the roadway, the influence of the pipeline deformation on the pavement should also be considered.

4) Structural type of pipe

A-type structure wall pipe: a pipe with flat inner and outer surfaces connected by internal spiral ribs between the inner and outer walls; or a smooth inner surface with a flat outer surface and a spiral hollow pipe buried in the pipe wall.

B-type structure wall tube: the inner surface is smooth, and the outer surface is a hollow spiral rib tube.

5) Pipe fittings: The pipe fittings are formed by secondary processing of the corresponding types of pipes or solid wall pipes that comply with the requirements of GB / T 19472.2-2004. There are mainly elbows, tees and pipe plugs of various connection methods.

6) Appearance: The inner surface of the pipes and fittings should be flat, and the external ribs should be regular; the inner and outer walls of the pipes and fittings should be free of bubbles and visible impurities, and the fusion seam should not be disengaged. The section of the pipe and fittings after cutting should be trimmed without burrs.

Regarding the current status of China's PE winding tube market, and what relevant knowledge is there for the design points of PE winding tube, I will share here for you. I believe that after my talk, everyone has a better understanding of the situation of China's PE winding pipe. However, with the development of PE winding pipe production and technology, some new structural wall pipes have been developed at home and abroad, such as steel belt reinforced Winding pipes, etc., PE winding pipes will gradually formulate relevant product standards according to the needs of production and use.

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