Standard Pipe Diameters and DN Equivalents
The term “DN” (nominal diameter) refers to the nominal diameters of pipes. Pipes are usually classified by their internal diameters. The nominal diameter is a rounded standard value of the pipe’s external diameter and is typically expressed in inches or millimeters.
For example, if the nominal diameter of a pipe is “DN 50,” this indicates that the external diameter of the pipe is approximately 50 millimeters or 2 inches, based on a specific standard value.
These standards can vary from country to country and across industries. The most commonly used pipe standard is the American standards based on Nominal Pipe Sizes (NPS). In other countries, nominal diameters based on the metric measurement system may be used.
DN PIPE DIAMETERS
Therefore, the term “DN pipe diameters” is commonly used to specify the pipe diameters utilized in pipelines and industrial applications. To obtain more detailed information about pipe diameters and standards, it is important to refer to the documentation of a specific country or standard.
| ANMA ÇAPI (mm) | OUTER DIAMETER(mm) | CİDAR KALINLIĞI(mm) | İÇ ÇAP (mm) | |
| 1/2″ | DN 15 | 21,3 | 2,8 | 15,7 |
| 3/4″ | DN 20 | 26,9 | 2,9 | 21,1 |
| 1″ | DN 25 | 33,7 | 3,4 | 26,9 |
| 1 1/4″ | DN 32 | 42,4 | 3,6 | 35,2 |
| 1 1/2″ | DN 40 | 48,3 | 3,7 | 40,9 |
| 2″ | DN 50 | 60,3 | 3,9 | 52,5 |
| 2 1/2″ | DN 65 | 73.0 | 5,2 | 62,6 |
| 3″ | DN 80 | 88,9 | 5,5 | 77,9 |
| 4″ | DN 100 | 114,3 | 6 | 102,3 |
| 5″ | DN 125 | 141.0 | 6,6 | 127,8 |
| 6″ | DN 150 | 168,3 | 7,1 | 154,1 |
| 8″ | DN 200 | 219,1 | 8,18 | 202,74 |
| 12″ | DN 300 | 323 | 9,5 | 304 |
| 16″ | DN 400 | 406 | 9,5 | 387 |
| 18″ | DN 450 | 470 | 9,5 | 451 |
| SCH NORMS | ||||||||||||||
| NOMINAL DIAMETER | OUTER DIAMETER (INCH) | OUTER DIAMETER (mm) | SCH 20 | SCH 30 | SCH 40 | SCH 60 | SCH 80 | SCH 100 | SCH 120 | SCH 140 | SCH 160 | XXS | ||
| 1/8 | 10,30 | 1,73 | 2,41 | |||||||||||
| 1/4 | 13,70 | 2,24 | 3,02 | |||||||||||
| DN 10 | 3/8 | 17,10 | 2,31 | 3,20 | ||||||||||
| DN 15 | 1/2 | 21,30 | 2,77 | 3,73 | 4,78 | 7,47 | ||||||||
| DN 20 | 3/4 | 26,70 | 2,87 | 3,91 | 5,56 | 7,82 | ||||||||
| DN 25 | 1 | 33,40 | 3,38 | 4,55 | 6,35 | 9,09 | ||||||||
| DN 32 | 1 1/4 | 42,20 | 3,56 | 4,85 | 6,35 | 9,70 | ||||||||
| DN 40 | 1 1/2 | 48,30 | 3,68 | 5,08 | 7,14 | 10,16 | ||||||||
| DN 50 | 2 | 60,30 | 3,91 | 5,54 | 8,74 | 11,07 | ||||||||
| DN 65 | 2 1/2 | 73,00 | 5,16 | 7,01 | 9,52 | 14,02 | ||||||||
| DN 80 | 3 | 88,90 | 5,49 | 7,62 | 11,13 | 15,24 | ||||||||
| DN 90 | 3 1/2 | 101,60 | 5,74 | 8,08 | ||||||||||
| DN 100 | 4 | 114,30 | 6,02 | 8,56 | 11,13 | 13,49 | 17,12 | |||||||
| DN 125 | 5 | 141,30 | 6,55 | 9,52 | 12,70 | 15,88 | 19,05 | |||||||
| DN 150 | 6 | 168,30 | 7,11 | 10,97 | 14,27 | 18,26 | 21,95 | |||||||
| DN 200 | 8 | 219,10 | 6,35 | 7,04 | 8,18 | 10,31 | 12,70 | 15,09 | 18,26 | 20,62 | 23,01 | |||
| DN 250 | 10 | 273,00 | 6,35 | 7,80 | 9,27 | 12,70 | 15,09 | 18,26 | 21,44 | 25,40 | 28,58 | |||
| DN 300 | 12 | 323,90 | 6,35 | 8,38 | 10,31 | 14,27 | 17,47 | 21,44 | 25,40 | 28,58 | 33,34 | |||
| DN 350 | 14 | 355,60 | 7,92 | 9,52 | 11,13 | 15,09 | 19,05 | 23,82 | 27,79 | 31,75 | 35,71 | |||
| DN 400 | 16 | 406,40 | 7,92 | 9,52 | 12,70 | 16,64 | 21,44 | 26,19 | 30,96 | 36,52 | 40,49 | |||
| DN 450 | 18 | 457,20 | 7,92 | 11,13 | 14,27 | 19,05 | 23,82 | 29,36 | 34,92 | 39,69 | 45,24 | |||
| DN 500 | 20 | 508,00 | 9,52 | 12,70 | 15,09 | 20,62 | 26,19 | 32,54 | 38,10 | 44,45 | 50,01 | |||
| DN 550 | 22 | 558,80 | 9,52 | 12,70 | 22,22 | 28,60 | 34,92 | 41,28 | 47,62 | 53,98 | ||||
| DN 600 | 24 | 609,60 | 9,52 | 14,27 | 17,48 | 24,61 | 30,96 | 38,89 | 46,02 | 52,30 | 59,54 | |||
EN ISO 1127 SEAMED AND UNSEAMED STAINLESS STEEL PIPE DIMENSIONS AND TOLERANCES
pipe dimensions and tolerances according to ASTM-A 312/ANSI B 36.19 and 36.10
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