The nominal diameter of seamless steel pipe is the size of all piping accessories in the piping system. The nominal diameter is a convenient rounded element for reference and is not strictly related to the machining dimension. Nominal diameter with the letter "DN" followed by a digital sign. Seamless steel pipe
Nominal diameter, also known as the average outside diameter (mean outside diameter).
This is the tube from the metal tube is thin, tube diameter and tube diameter is almost the same, so the outer diameter of the tube and the tube diameter of the average as the diameter of the call.
DN is the nominal diameter, nominal diameter (or nominal diameter), is a variety of pipe and pipe accessories common caliber. The same nominal diameter of the pipe and pipe accessories can be interconnected, with interchangeability.It is not the actual sense of the pipe diameter or diameter, although its value and pipe diameter is closer or equal. In order to make the pipe, pipe connection size uniform, using the nominal diameter (also known as nominal diameter, nominal diameter). For example, welded steel pipe can be divided into thin-walled steel pipe, ordinary steel pipe and thickened steel pipe. Seamless steel pipe. Its nominal diameter is not the outer diameter, nor is the inner diameter, but similar to the ordinary pipe diameter of a nominal size. Each nominal diameter corresponds to an outer diameter whose inner diameter varies with thickness. Nominal diameter can be expressed in metric mm, also available in English.
