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Basic Concepts > Design > ANSI-ASME vs ISO equivalences Español
 
Diameter: NPS vs DN
Pressure Rating: PN vs ANSI Class
 
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Equivalence Nominal Pipe Size (NPS) to Nominal Diameter (DN)

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]
1/86
1/48
3/810
1/215
3/420
125
1 1/432
1 1/240
250
2 1/265
380
3 1/290
4100
4 1/2115
5125
Nominal Pipe Size

NPS

[inches]
Nominal Diameter

DN

[mm]
6150
8200
10250
12300
14350
16400
18450
20500
24600
28700
32800
36900
401000
421050
441100
Nominal Pipe Size

NPS

[inches]
Nominal Diameter

DN

[mm]
481200
521300
561400
601500
641600
681700
721800
761900
802000
882200
962400
1042600
1122800
1203000
1283200

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