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Nominal diameter, also known as the mean outside diameter.
This is because the pipe rim from the metal pipe is very thin. The outer diameter of the pipe is almost the same as the inner diameter of the pipe. Therefore, the average value of the outer diameter of the pipe and the inner diameter of the pipe is called as the pipe diameter. (The numerical value of the nominal diameter is not the average of the internal and external diameters. Please verify by the author)
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 connected to each other and have interchangeability. 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 and pipe fittings uniform in size, nominal diameter (also called nominal diameter, nominal diameter) is used. 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.
51 steel pipe network: DN in stainless steel tube
51 Steel pipe network: What is the meaning of DN in stainless steel pipe? The nominal diameter is the size of all the pipe accessories in the pipe system. The nominal diameter is a convenient round integer for reference, and it is not strict with the processing size. Relationship. The nominal path is followed by the letter "DN" followed by a number sign.