Comparison Table of Nominal Diameter (DN) And Pipe Size
Comparison Table of Nominal Diameter (DN) And Pipe Size
DN refers to the nominal diameter of the pipeline, in millimeters
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2 cents = DN8
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1’ | DN25 |
1.2’ | DN32 |
1.5’ | DN40 |
2’ | DN50 |
2.5’ | DN65 |
3’ | DN80 |
4’ | DN100 |
5’ | DN125 |
6’ | DN150 |
8’ | DN200 |
10’ | DN250 |
12’ | DN300 |
Generally speaking, the diameter of pipes can be divided into outer diameter, inner diameter, and nominal diameter.
Comparison of nominal diameter and outer diameter of commonly used pipelines
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Pipeline nominal diameter
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Outer diameter of pipe φ（mm）
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DN 15
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φ18
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DN 20
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φ25
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DN 25
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φ32
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DN 32 | φ38 |
DN 40 | φ45 |
DN 50 | φ57 |
DN 65 | φ76 |
DN 80 | φ89 |
DN 100 | φ108 |
DN 125 | φ133 |
DN 150 | φ159 |
DN 200 | φ219 |
DN 250 | φ273 |
DN 300 | φ325 |
DN 350 | φ377 |
DN 400 | φ426 |
DN 450 | φ480 |
DN 500 | φ530 |
DN 600 | φ630 |
DN 700 | φ720 |
DN 800 | φ820 |
DN 900 | φ920 |
DN 1000 | φ1020 |
DN 1200 | φ1220 |
DN 1400 | φ1420 |
The nominal diameter, also known as the mean outer diameter. Refers to the standardized diameter, expressed in DN, in millimeters. For example, the nominal diameter of a container with an inner diameter of 1200mm is marked as DN1200.
