DN is equivalent to a general term, De stands for outside diameter and DN stands for nominal diameter. DN 150=De 160 .

Example: If the wall thickness of DN200 steel pipe is 10mm, it will be represented by D2 19× 10; DN200 concrete pipe φ200 said; The PE pipe of DN 100 is represented by PE 1 10 and so on.

Second, the expression is different:

The pipe diameter of water gas transportation steel pipe (galvanized or non-galvanized), cast iron pipe and other pipes should be represented by the nominal diameter DN (such as DN 15, DN50).

The pipe diameter of seamless steel pipe, welded steel pipe (straight seam or spiral seam), copper pipe, stainless steel pipe, etc. shall be expressed as external diameter D× wall thickness (such as D 108×4, D 159×4.5, etc.). ).

Third, the role is different:

De mainly refers to the outside diameter of the pipeline, which is generally marked with De, and needs to be marked in the form of outside diameter x wall thickness; Mainly used to describe: seamless steel pipes, PVC and other plastic pipes, as well as other pipes with clear wall thickness.

Taking galvanized welded steel pipe as an example, the two marking methods of DN and De are as follows: DN 20 DE 25 X 2.5 mm DN 25 DE 32 X3mm DN 32 DE 40 X4mm DN 40 DE 50 X4mm.

Extended data:

Static mixers are generally composed of three sections (the number of sections can also be increased according to the performance of mixed media). Each mixer has a 180 twisted fixed spiral blade, which can be divided into left-handed and right-handed blades. The spiral blades in two adjacent parts rotate in opposite directions and are staggered by 90 degrees.

In order to facilitate the installation of spiral blades, the cylinder is made into two semicircles, the two ends are connected by flanges, and the gap between the cylinders is bonded by epoxy resin to ensure its sealing requirements. The spiral blades of the mixer do not move, but only move the mixed materials or media. The fluid passes through it, and there is no external energy except the pressure drop. Mainly divided flow, radial mixing and reverse rotation, the two media are constantly and violently mixed and diffused to achieve the purpose of mixing.

Baidu Encyclopedia-Static Mixer DN 150