DN refers to the nominal diameter of the pipe, Note: This is neither the outer diameter nor the inner diameter, is the average diameter and inner diameter, said the average diameter; general valve manufacturers use DN said. De mainly refers to the pipe diameter, the general use of De annotation, are required to be marked as outer diameter X wall thickness form; D generally refers to the inner diameter.

The diameter of the expression should meet the following requirements:

Water and gas transmission pipe (galvanized or non-galvanized), cast iron pipe, pipe diameter should be DN nominal diameter; seamless steel pipe, welded steel pipe (straight seam or spiral seam), brass, stainless steel pipe, pipe diameter Should be outside diameter × wall thickness; reinforced concrete (or concrete) pipe, clay pipe, acid-resistant ceramic tube, cylinder tube and other pipe diameter should be indicated by the inner diameter d; plastic pipe, pipe diameter should be based on product standards that;

When the design is used to indicate the nominal diameter DN diameter, there should be a nominal diameter DN and the corresponding product specifications table. Usually with seam pipe DN, De generally refers to the outer diameter of the plastic pipe, Pe generally refers to the nominal pressure of the plastic pipe; DN is the nominal diameter, nominal diameter (or nominal diameter), is a variety of pipes and tubes Road accessories common caliber. De, Pe refers to the outer diameter of plastic pipe; Ф common means the diameter of the circle. Diameter DN: Nominal diameter pipe diameter, nominal diameter (nominal diameter), also known as the average diameter (mean outside diameter).

This is because the tube wall is thin metal tube, tube diameter and tube diameter is almost the same, so take the tube diameter and the average diameter of the tube as a diameter call. Nominal diameter is the metric mm as the base, said DN (metric unit), such as DN100 tube, if you encounter thin-walled tube, it will be greater than the inner diameter of 100mm, but thick walled tube encounter its diameter will be less than 100mm. But when calculating take 100mm. Also called DN100 In general, the diameter of the pipe can be divided into outer diameter, inner diameter, nominal diameter.

The outer diameter of a seamless steel pipe is indicated by the letter D, followed by the addition of outer diameter dimensions and wall thickness, for example a seamless steel pipe with an outer diameter of 108 mm and a wall thickness of 5 mm, indicated by D108 * 5. The galvanized steel pipe is indicated by DN.

In the design drawings to use the nominal diameter DN, the purpose is to determine the nominal diameter of the pipe, fittings, valves, flanges, gaskets and other structural dimensions, nominal size with DN said that if the design drawings with the outer diameter that is Pipeline specifications should be made, indicating the nominal diameter of a pipe, wall thickness.

Although many standard systems applied in various countries in the world can be broadly divided into two categories, that is, a large outer diameter series and a small outer diameter series.

Large diameter series: (DN --- nominal diameter. ¢ --- OD).

DN15 --- ¢ 22mm.DN20 --- ¢ 27mm.DM25 --- ¢ 34mm.

DN32 --- ¢ 42mm.DN40 --- ¢ 48mm.DN50 --- ¢ 60mm.

DN65 --- ¢ 76 (73) mm.DN80 --- ¢ 89mm.DN100 --- ¢ 114mm.

DN125 --- ¢ 140mm.DN150 --- ¢ 168mm.DN200 --- ¢ 219mm.

DN250 --- ¢ 273mm.DN300 --- ¢ 324mm.DN350 --- ¢ 360mm.

DN400 --- ¢ 406mm.DN450 --- ¢ 457mm.DN500 --- ¢ 508mm.

DN600 --- ¢ 610mm.

Small diameter series:

DN15 --- ¢ 18mm.DN20 --- ¢ 25mm.DN25 --- ¢ 32mm.

DN32 --- ¢ 38mm.DN40 --- ¢ 45mm.DN50 --- ¢ 57mm.

DN65 --- ¢ 73mm.DN80 --- ¢ 89mm.DN100 --- ¢ 108mm.

DN125 --- ¢ 133mm.DN150 --- ¢ 159mm.DN200 --- ¢ 219mm.

DN250 --- ¢ 273mm.DN300 --- ¢ 325mm.DN350 --- ¢ 377mm.

DN400 --- ¢ 426mm.DN450 --- ¢ 480mm.DN500 --- ¢ 530mm.

DN600 --- ¢ 630mm.

General standard steel pipe can be found from the material list per meter weight.If non-standard pipe can be measured by the actual size to calculate its weight.

Weight = (OD - Wall Thickness) * Wall Thickness * π * Length * 7.85.

Unit of weight --- tons.

Its unit --- meters.

Difference between DN Dg and De

DN Nominal diameter

De external diameter

Dg diameter gong (Pinyin "phonetic") Now you understand that Dg is a domestic product, with Chinese characteristics of domestic products, now do not have.

DN refers to the nominal diameter of the pipe, Note: This is neither the outer diameter nor the inner diameter, is the average diameter and inner diameter, said the average diameter.

De mainly refers to the pipe diameter, generally marked with De, are required to be marked as the outer diameter X wall thickness of the form.

D generally refers to the diameter.

Φ represents the outer diameter, usually followed by the wall thickness, that is Φ108X4 form. Φ is the Greek alphabet, D is the English alphabet, all indicate diameter.

DN is the number of De minus the thickness of the tube wall

The amount of De is the diameter of the outer wall of the pipe

Dg generally no one used

1, diameter should be in mm.

2, the diameter of the expression should meet the following requirements:

1), water gas transmission pipe (galvanized or non-galvanized), cast iron pipe and other pipe diameter should be DN (such as DN15, DN50);

2), seamless steel pipe, welded steel pipe (straight seam or spiral seam), brass, stainless steel pipe and other pipe diameter should be expressed in terms of diameter D × wall thickness (such as D108 × 4, D159 × 4.5, etc.)

3), reinforced concrete (or concrete) pipe, clay pipe, acid-resistant ceramic tube, cylinder tube and other pipe diameter should be d (such as d230, d380, etc.);

4), plastic pipe, pipe diameter should be based on product standards that;

5), when the design is used to indicate the nominal diameter DN diameter, there should be a nominal diameter DN and the corresponding product specifications table.

Building drainage (rigid PVC adhesive socket pipe) specifications with dn (nominal diameter) × e (pipe wall thickness) that (GB-T 5836.1-2006) water supply with polypropylene (PP) pipe specifications de × e said (nominal diameter × wall thickness)

Plastic pipe sign on drawing

Metric dimension

Denoted by DN is generally referred to as "nominal size," it is not the tube diameter, nor the tube diameter. Is the average diameter and diameter, we call the average diameter.

Example: Plastic pipe with an outer diameter of 63 mm DN50

ISO metric dimension (ISO metric dimension size)

Da said PVC pipe, ABS pipe pipe diameter

De said PP pipe, PE pipe pipe diameter

New materials and plastic pipe with the attention of lowercase Oh.

DN is mainly used in cast iron pipe and galvanized steel pipe. In addition, DN100 is equivalent to the diameter of de110, DN150 is equivalent to the diameter of de160.

1, diameter should be in mm.

2, the diameter of the expression should meet the following requirements:

1), water gas transmission pipe (galvanized or non-galvanized), cast iron pipe and other pipe diameter should be DN (such as DN15, DN50);

2), seamless steel pipe, welded steel pipe (straight seam or spiral seam), brass, stainless steel pipe and other pipe diameter should be expressed in terms of diameter D × wall thickness (such as D108 × 4, D159 × 4.5, etc.)

3), reinforced concrete (or concrete) pipe, clay pipe, acid-resistant ceramic tube, cylinder tube and other pipe diameter should be d (such as d230, d380, etc.);

4), plastic pipe, pipe diameter should be based on product standards that;

5), when the design is used to indicate the nominal diameter DN diameter, there should be a nominal diameter DN and the corresponding product specifications table.

Building drainage (rigid PVC adhesive socket pipe) specifications with dn (nominal diameter) × e (pipe wall thickness) that (GB-T 5836.1-2006) water supply with polypropylene (PP) pipe specifications de × e said (nominal diameter × wall thickness)

Plastic pipe sign on drawing

Metric dimension

Denoted by DN is generally referred to as "nominal size," it is not the tube diameter, nor the tube diameter. Is the average diameter and diameter, we call the average diameter.

Example: Plastic pipe with an outer diameter of 63 mm DN50

ISO metric dimension (ISO metric dimension size)

Da said PVC pipe, ABS pipe pipe diameter

De said PP pipe, PE pipe pipe diameter

New materials and plastic pipe with the attention of lowercase Oh.

DN is mainly used in cast iron pipe and galvanized steel pipe. In addition, DN100 is equivalent to the diameter of de110, DN150 is equivalent to the diameter of de160.

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