"Double-arm bellows with a diameter of 1 meter: what is the corresponding DN model?"

In the field of municipal engineering and infrastructure building, the double-arm corrugated pipe has become the first choice for drainage and sewage systems due to its unique structural design and excellent performance. When encountering a double-arm corrugated pipe with a diameter of 1 meter, the most concerned question for many engineering and technical personnel is: What is the DN model corresponding to it?

First of all, it needs to be made clear that the diameter of the double-arm corrugated pipe usually refers to the outer diameter of the pipe. According to the national standard GB/T 19472.1-2004 "Buried Polyethylene (PE) Structural Wall Pipeline System Part 1: Polyethylene Double Wall Corrugated Pipe", the nominal diameter DN usually corresponds to the minimum inner diameter of the pipe. For a double-arm corrugated pipe with an outer diameter of 1000mm, the corresponding nominal diameter is generally DN800 or DN900, which needs to be determined according to the wall thickness structure of the pipe and the ring stiffness grade.

Why does this difference occur? It mainly depends on the structural characteristics of the corrugated pipe. The double-arm corrugated pipe adopts a special structure with an annular corrugated outer wall and a smooth inner wall. This design realizes the best distribution of materials while ensuring the ring stiffness of the pipe. Therefore, pipes with the same outer diameter may correspond to different nominal diameters due to different wall thicknesses.

In the actual engineering selection, in addition to paying attention to the correspondence between the diameter and the DN model, the following key factors need to be comprehensively considered:

1. Ring stiffness requirements: Different projects have different ring stiffness requirements for pipes, which are usually divided into SN4, SN8, SN12.5 and other grades. The higher the ring stiffness, the better the compressive performance of the pipe.

2. Connection method: The commonly used connection methods of double-arm corrugated pipes are socket type, Huff joint connection, etc. Different connection methods will affect the construction efficiency and sealing performance.

3. Geological conditions: The geological conditions of the project location directly affect the selection of pipes. Soft soil foundation may require pipes with higher ring stiffness.

4. Burial depth requirements: The burial depth of the pipeline is directly related to the earth pressure and dynamic load it bears. It is necessary to choose pipes with suitable ring stiffness accordingly.

In the actual procurement and use process, it is recommended that you:

- Consult the product specification table provided by the manufacturer to confirm the size parameters of the specific model

- Select the corresponding product according to the nominal diameter of the engineering design requirements

- Pay attention to check whether the ring stiffness grade of the pipe meets the engineering requirements

- Confirm that the connection method matches the construction plan

Correctly understand the corresponding relationship between the 1-meter diameter double-arm bellows and the DN model, which not only helps to accurately select the type, but also ensures the quality and safety of the project. With the continuous development of material technology, the specification system of double-arm bellows is also constantly improving. It is recommended that engineering and technical personnel pay attention to the latest national standards and industry specifications in time to ensure the accuracy and reliability of engineering selection.