What do DN and PN stand for on the flange?
I can make it clear to you that DN stands for caliber, that is, specifications. And PN means pressure. These are not perfect. The most perfect should have the standard of execution, material and so on.
The nominal DN identifier;PN identifier for nominal pressure.
Nominal diameter (nominal, diameter), also known as the average diameter (mean, outside, diameter).Nominal diameter is the size of all piping accessories in the piping system. The nominal diameter is a convenient round integer for reference and is not strictly related to the processing size. The nominal diameter follows the letter "DN" followed by a number sign.DN is nominal diameter, nominal diameter (or nominal diameter), that is, all kinds of pipe and pipe accessories of universal caliber. The pipes of the same nominal diameter can be connected with each other and are interchangeable. It is not the outer diameter or inner diameter of the pipe in actual sense, although its value is close to or equal to the diameter of the pipe.PN nominal pressure.DefinitionRelating to the mechanical and dimensional characteristics of the components of the piping system and the identification of letters and combinations of numbers for reference. It consists of letters PN and followed by dimensionless numbers.Note 1: numbers followed by letters "PN" do not represent measurements and are not used for purposes of calculation unless otherwise specified in the relevant standards.Note 2: is not associated with the relevant pipe component standards, but the term "PN" does not make sense.Note the 3: piping element allows the pressure to depend on the PN value of the element, the material and design, and allows the operating temperature, etc., to allow the pressure to be given in the corresponding standard pressure temperature class table.Note 4: all pipe elements with the same PN and DN values shall have the same mating dimensions as their flanges.
