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NPS and DN
Published:2013-05-02 04:19:37    Text Size:【BIG】【MEDIUM】【SMALL
Summary:NPS - "Nominal Pipe Size" DN - "Diametre Nominal"

Pipe is a ubiquitous product in the construction industry. It is made of a wide variety of materials - galvanized steel, black steel, copper, cast iron, concrete, and various plastics such as ABS, PVC, CPVC, polyethylene and polybutylene, among others.

Pipes are identified by "nominal" or "trade" names that are loosely related to the actual dimensions. For instance, a 2-inch galvanized steel pipe has an inside diameter of about 2 1/8 inches and an outside diameter of about 2 5/8 inches.

It is common to identify pipes by inches using NPS or "Nominal Pipe Size". The metric equivalent is called DN or "diametre nominel". The metric designations conform to International Standards Organization (ISO) usage and apply to all plumbing, natural gas, heating oil, and miscellaneous piping used in buildings. The use of NPS does not conform to American Standard pipe designations where the term NPS means "National Pipe Thread Straight".

Diameter Nominal
DN
(mm)
Nominal Pipe Size
NPS
(inches)
61/8
81/4
103/8
151/2
203/4
251
321 1/4
401 1/2
502
652 1/2
803
1004
1506
2008
25010
30012
35014
40016
45018
50020
55022
60024
65026
70028
75030
80032
90036
100040
105042
110044
120048
130052
140056
150060
160064
170068
180072
190076
200080
220088
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