Nominal Pipe Size (NPS) is based on inches, and DN (diamètre nominal/nominal diameter) in millimetres.
ISO 6708 norm defines Nomimal Diameter for pipe components.
Nominal Pipe Size
NPS
[inches] |
Nominal Diameter
DN
[mm] |
| 1/8 |
6 |
| 1/4 |
8 |
| 3/8 |
10 |
| 1/2 |
15 |
| 3/4 |
20 |
| 1 |
25 |
| 1 1/4 |
32 |
| 1 1/2 |
40 |
| 2 |
50 |
| 2 1/2 |
65 |
| 3 |
80 |
| 3 1/2 |
90 |
| 4 |
100 |
| 4 1/2 |
115 |
| 5 |
125 |
|
Nominal Pipe Size
NPS
[inches] |
Nominal Diameter
DN
[mm] |
| 6 |
150 |
| 8 |
200 |
| 10 |
250 |
| 12 |
300 |
| 14 |
350 |
| 16 |
400 |
| 18 |
450 |
| 20 |
500 |
| 24 |
600 |
| 28 |
700 |
| 32 |
800 |
| 36 |
900 |
| 40 |
1000 |
| 42 |
1050 |
| 44 |
1100 |
|
Nominal Pipe Size
NPS
[inches] |
Nominal Diameter
DN
[mm] |
| 48 |
1200 |
| 52 |
1300 |
| 56 |
1400 |
| 60 |
1500 |
| 64 |
1600 |
| 68 |
1700 |
| 72 |
1800 |
| 76 |
1900 |
| 80 |
2000 |
| 88 |
2200 |
| 96 |
2400 |
| 104 |
2600 |
| 112 |
2800 |
| 120 |
3000 |
| 128 |
3200 |
|
