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DN and de pipe diameter comparison table, pipe diameter and stainless steel valve corresponding table

Label: size, control, table, table, stainless steel, valve, corresponding addition time: May 25, 2021 click 1280 second

For those who are first in contact with the nominal diameter of the pipe, the word is a bit elusive. As usual, the diameter of the pipe can be divided into outer diameter, inner diameter and nominal diameter.

De、DN、D、d、 Φ The meaning of

De (external diameter) means the outer diameter of the pipe Henan personnel examination Net home page, PPR, PE pipe, polypropylene pipe, seamless steel pipe, welded steel pipe (straight seam or spiral seam), copper pipe, stainless steel pipe and other pipes, the pipe diameter should be the outer diameter × Wall thickness revealed performance (e.g. de108 × 4、De159 × 4.5, etc.);


D is the inner diameter of the pipe.


D usually refers to the inner diameter of concrete pipe. For reinforced concrete (or concrete) pipe, clay pipe, acid resistant ceramic pipe, cylinder tile pipe, etc., the pipe diameter should be revealed with the inner diameter D (such as D230, D380, etc.).


Φ Reveal the diameter of the popular circle; The outer diameter of the tube can also be revealed, but it should be multiplied by the wall thickness at this time. For example: Φ twenty-five × three Production of large characters on the roof The outer diameter is 25 mm and the wall thickness is 3 mm. For seamless steel pipe or non-ferrous metal pipe, the "outer diameter" shall be marked × Wall thickness ". for example Φ one hundred and eight × 4, Φ It can be omitted. Some steel pipe standards in China, ISO and Japan adopt wall thickness size to reveal the steel pipe wall thickness series. The specification of this kind of steel pipe is revealed by the outer diameter of the pipe × Wall thickness. for example Φ sixty point five × 3.8。


External diameter of pipeline

The steel pipes produced and used in our country can be divided into two series according to the outer diameter: Series I and Series II, or series a and B. Series I or a series of steel pipe is "British pipe", commonly known as "large outer diameter pipe"; Series II or B series steel pipe is called "metric pipe", commonly known as "small outer diameter pipe". The so-called "large outer diameter pipe and small outer diameter pipe" means that under the condition of the same nominal diameter of the pipeline, the pipe accessories (such as flange Stainless steel valve The outer diameter of the steel pipe used is larger than that of the "large outer diameter" pipe; The smaller one is called the "small outer diameter" tube. For example, for the flange with nominal diameter of DN 100, the outer diameter of Φ The outer diameter of 114.3mm pipe can be selected Φ For 108mm pipe, the former is called "large outer diameter" pipe or "series I or a series" pipe; The latter is called "small outer diameter" tube or "Series II or series B" tube.


In the field of engineering, there is no complete comparison between the nominal diameter and the outer diameter of the pipeline, and the conversion between the outer diameter and the nominal diameter basically depends on experience. The nominal diameter is approximately equal to the inner diameter (the outer diameter minus two skin thicknesses), but it is not completely matched. It is about the same network marketing Company, round it. such as φ The outer diameter of 108 * 7 is 108, and its nominal diameter is 100; Another example is φ 32 * 4.5, outer diameter 32, nominal diameter 25. By analogy, the corresponding relationship between the outer diameter and the nominal diameter can be obtained.


Comparison table of pipe fitting size in mm

Diameter inch Nominal diameter (mm) Pipe outer diameter (mm)
1/4″ eight thirteen point seven
3/8″ ten seventeen point one four
1/2″ fifteen twenty-one point three
3/4″ twenty twenty-six point seven
1″ twenty-five thirty-three point four
1.2″ thirty-two forty-two point two
1.5″ forty forty-eight point three
2″ fifty sixty point three
2.5″ sixty-five seventy-three
3″ eighty eighty-eight point nine
4″ one hundred one hundred and fourteen point three
5″ one hundred and twenty-five one hundred and forty-one point three
6″ one hundred and fifty one hundred and sixty-eight point three
8″ two hundred two hundred and nineteen point one
10″ two hundred and fifty two hundred and seventy-three
12″ three hundred three hundred and twenty-three point eight
14″ three hundred and fifty three hundred and fifty-five point six
16″ four hundred four hundred and six point four


Pipe diameter DN (nominal diameter) and pipe outer diameter Ф( Mm)

Nominal diameter (DN) Pipe OD Ф( Small outer diameter) Pipe OD Ф( Large outer diameter)
fifteen eighteen twenty-two
twenty twenty-five twenty-seven
twenty-five thirty-two thirty-four
thirty-two thirty-eight forty-two
forty forty-five forty-eight
fifty fifty-seven sixty
sixty-five seventy-three seventy-six
eighty eighty-nine eighty-nine
one hundred one hundred and eight one hundred and fourteen
one hundred and twenty-five one hundred and thirty-three one hundred and forty
one hundred and fifty one hundred and fifty-nine one hundred and sixty-eight
two hundred two hundred and nineteen two hundred and nineteen
two hundred and fifty two hundred and seventy-three two hundred and seventy-three
three hundred three hundred and twenty-four three hundred and twenty-five
three hundred and fifty three hundred and sixty three hundred and seventy-seven
four hundred four hundred and six four hundred and twenty-six
four hundred and fifty four hundred and fifty-seven four hundred and eighty
five hundred five hundred and eight five hundred and thirty
six hundred six hundred and ten six hundred and thirty
seven hundred seven hundred and twenty
eight hundred eight hundred and twenty
nine hundred nine hundred and twenty
one thousand one thousand and twenty
one thousand and two hundred one thousand two hundred and twenty
one thousand and four hundred one thousand four hundred and twenty
one thousand and six hundred one thousand six hundred and twenty
one thousand and eight hundred one thousand eight hundred and twenty
two thousand two thousand and twenty
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