TPEP anti-corrosion spiral steel pipe refers to a steel pipeline that has been processed through anti-corrosion technology, which can effectively prevent or slow down the occurrence of chemical or electrochemical reactions and corrosion during transportation and use. Anti corrosion spiral steel pipes can effectively prevent or slow down corrosion, extend the service life of steel pipes, and reduce the operating costs of steel pipes.

The nominal diameter of TPEP anti-corrosion spiral steel pipe:

The diameter of anti-corrosion spiral steel pipes can be divided into outer diameter, inner diameter, and nominal diameter. The outer diameter of anti-corrosion spiral steel pipes is represented by the letter D, followed by the size and wall thickness of the outer diameter. For example, anti-corrosion spiral steel pipes with an outer diameter of 108 and a wall thickness of 5MM are represented by D108 * 5. Plastic pipes are also represented by the outer diameter, such as De63. Other pipes such as reinforced concrete pipes, cast iron pipes, galvanized pipes, etc. are represented by DN. In design drawings, nominal diameter is generally used as a standard artificially specified for the convenience of design, manufacturing, and maintenance. It is also a specification name for pipes (or fittings). The nominal diameter, inner diameter, and outer diameter of a pipe are not equal. For example, there are several spiral steel pipes with a nominal diameter of 100MM, such as 102 * 5 and 108 * 5. 108 is the outer diameter of the pipe, and 5 represents the wall thickness of the pipe. Therefore, the inner diameter of the pipe is (108 * 5-5)=98MM, but it is not exactly equal to the difference between the outer diameter of the pipe and twice the wall thickness. It can also be said that the nominal diameter is a specification name for a pipe diameter that is close to the inner diameter but not equal to the inner diameter. Therefore, the nominal diameter is used in the design drawings to determine the structural dimensions and connection dimensions of the pipe, fittings, valves, flanges, gaskets, etc. based on the nominal diameter. The nominal diameter is used. The symbol DN indicates that if the outer diameter is used in the design drawings, a pipeline specification comparison table should also be made to indicate the nominal diameter and wall thickness of a certain pipeline.