1DN is the meaning of the caliber. It is also expressed in the water supply and drainage, that is, 100 mm galvanized steel pipe. But please note that it is neither the inner diameter nor the outer diameter. This is because the pipe from the metal pipe is very thin. The outer diameter of the tube and the inner diameter of the tube are almost the same, so the average value of the outer diameter of the tube and the inner diameter of the tube is referred to as the diameter of the tube. DN is the nominal diameter, nominal diameter (or nominal diameter), and is the general caliber of various pipes and piping accessories. The pipes of the same nominal diameter and the pipeline accessories can be interconnected and interchangeable. It is not the actual outer diameter or inner diameter of the pipe, although its value is close to or equal to the inner diameter of the pipe; in order to make the pipe, the pipe fittings [/wiki] Uniform connection size, nominal diameter (also known as nominal diameter, nominal diameter). For example, the thickness of welded steel pipe can be divided into thin-walled steel pipe, ordinary steel pipe and thicker steel pipe. Its nominal diameter is not the outside diameter, nor is it the inside diameter, but a nominal size that approximates the inside diameter of a normal steel pipe. Each nominal diameter corresponds to one outer diameter, and its inner diameter value varies with the thickness. The nominal diameter can be expressed in metric mm, or in inch. Pipe fittings are also represented by the nominal diameter, meaning that there is a seam pipe.
2 There are many meanings for the following G: First, “G†is a galvanized steel pipe used for water gas, (abbreviation of gas tube pipe). This is commonly used in engineering and represents the second: in the past, the design of petroleum and chemical plants. In the middle, the wall thicknesses are all graded by nominal pressure. However, when determining the maximum operating pressure of a nominal pressure at different temperatures, the allowable stress value chosen is lower than the permissible stress at the corresponding temperature of the tube. Therefore, the thickness of the wall calculated from the nominal pressure is Not very reasonable, in order to save steel, choose a reasonable, to adapt to the use of new steel pipe. The thickness of the pipe wall is changed from the nominal pressure classification to the pipe number classification. The first letter G of the GUANZI Pinyin alphabet is preceded by the respective table number, such as G6, G10, G2D, G30, G45, G60, G100, G120, G140. Pipe No. = P/[σ] × 10 Where P is the pressure in the pipe (kg/cm 2 ); [σ] is the allowable stress (kg/mm ​​2 ) at the operating temperature of the pipe material. When selecting the wall thickness of the pipe, the allowable stress value of the pipe under the operating temperature is firstly found, and then the pipe number is found. Finally, check the wall thickness of various types of pipes.
In other words, the 100 at this time is not a diameter or a diameter, but a label! G100 is 100th steel pipe.
2 There are many meanings for the following G: First, “G†is a galvanized steel pipe used for water gas, (abbreviation of gas tube pipe). This is commonly used in engineering and represents the second: in the past, the design of petroleum and chemical plants. In the middle, the wall thicknesses are all graded by nominal pressure. However, when determining the maximum operating pressure of a nominal pressure at different temperatures, the allowable stress value chosen is lower than the permissible stress at the corresponding temperature of the tube. Therefore, the thickness of the wall calculated from the nominal pressure is Not very reasonable, in order to save steel, choose a reasonable, to adapt to the use of new steel pipe. The thickness of the pipe wall is changed from the nominal pressure classification to the pipe number classification. The first letter G of the GUANZI Pinyin alphabet is preceded by the respective table number, such as G6, G10, G2D, G30, G45, G60, G100, G120, G140. Pipe No. = P/[σ] × 10 Where P is the pressure in the pipe (kg/cm 2 ); [σ] is the allowable stress (kg/mm ​​2 ) at the operating temperature of the pipe material. When selecting the wall thickness of the pipe, the allowable stress value of the pipe under the operating temperature is firstly found, and then the pipe number is found. Finally, check the wall thickness of various types of pipes.
In other words, the 100 at this time is not a diameter or a diameter, but a label! G100 is 100th steel pipe.
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