"Double-walled tube 800: What is the outer diameter? National standard size regulations"

In municipal engineering, road drainage and other fields, double-wall corrugated pipes are widely used because of their excellent ring stiffness and light weight. Among them, DN800 is a common large-diameter specification, and the accuracy of its outer diameter dimensions is directly related to the quality and compliance of the project. So, what is the outer diameter of double-wall pipe 800? What is the clear regulation of the national standard?

According to the national standard GB/T 19472.2-2017 "Buried polyethylene (PE) structural wall piping system, Part 2: Polyethylene wound structural wall pipes", double-wall corrugated pipes with a nominal diameter of 800mm have a nominal value of 800mm. However, it should be noted that there is a certain deviation range allowed in actual production. The standard stipulates that for the pipe of dn/ID 800, the average outer diameter dem should meet: 794mm dem 806mm. This deviation range ensures the compatibility and system tightness of the pipeline during construction connection.

It is essential to understand this regulation. If the outer diameter is too small, it may cause the pipe and pipe fittings to not be tightly connected, and there is a risk of leakage; if the outer diameter is too large, it will cause difficulties in installation and construction, or even impossible to install. Therefore, strict adherence to the national standard size is the basis for ensuring the safe and reliable operation of the pipeline system.

In addition to the outer diameter, when choosing the double-wall pipe 800, it is also necessary to comprehensively consider its ring stiffness (common such as SN8, SN16 grade), raw materials (whether it is a new HDPE material) and length and other technical indicators. The correct selection can effectively ensure the long-term stable operation of the drainage system and prolong its service life.

In summary, the outer diameter of the double-wall pipe 800 is not a fixed value, but a range that meets national standards. When purchasing and accepting, be sure to check according to the specific parameters in GB/T 19472.2-2017 to ensure that the product meets the engineering design and specification requirements, laying a solid foundation for the success of the project.