What is the difference between nominal sizes according to DIN and NPS? | ACI Industriearmaturen GmbH

What is the difference between nominal sizes according to DIN and NPS?

The nominal width DN is a dimensionless number that defines the inner diameter of a pipeline or the connection dimension of a fitting. The nominal diameter DN indicates the approximate inner diameter of the pipeline in millimetres and is based on the metric system of measurement.

The designation Nominal Pipe Size, also called NPS, also quantifies the inner diameter of a pipeline or the connection dimension of a fitting. In this definition, too, the approximate inner diameter of the pipeline is named, but the information is given in inches, which originates from the Anglo-American system of measurement.

Nominal size DN

NPS in Inch

Pipe connection  ISO

Pipe connection EN

DN 6

1/8“

Ø 10,2 mm

Ø 10,2 mm

DN 8

1/4“

Ø 13,5 mm

Ø 13,5 mm

DN 10

3/8“

Ø 17,2 mm

Ø 17,2 mm

DN 15

1/2“

Ø 21,3 mm

Ø 21,3 mm

DN 20

3/4“

Ø 26,9 mm

Ø 26,9 mm

DN 25

1“

Ø 33,7 mm

Ø 33,7 mm

DN 32

1 1/4"

Ø 42,4 mm

Ø 42,4 mm

DN 40

1 1/2"

Ø 48,3 mm

Ø 48,3 mm

DN 50

2“

Ø 60,3 mm

Ø 60,3 mm

DN 65

2 1/2"

Ø 76,1 mm

Ø 76,1 mm

DN 80

3“

Ø 88,9 mm

Ø 88,9 mm

DN 100

4“

Ø 114,3 mm

Ø 114,3 mm

DN 125

5“

Ø 139,7 mm

Ø 139,7 mm

DN 150

6“

Ø 168,3 mm

Ø 168,3 mm

DN 200

8“

Ø 219,1 mm

Ø 219,1 mm

DN 250

10“

Ø 273,0 mm

Ø 273,0 mm

DN 300

12“

Ø 323,9 mm

Ø 323,9 mm

DN 350

14“

Ø 355,6 mm

Ø 355,6 mm

DN 400

16“

Ø 406,4 mm

Ø 406,4 mm

DN 450

18“

Ø 457,0 mm

Ø 457,0 mm

DN 500

20“

Ø 508,0 mm

Ø 508,0 mm

DN 600

24“

Ø 610,0 mm

Ø 610,0 mm

DN 700

28“

Ø 711,0 mm

Ø 711,0 mm

DN 800

32“

Ø 813,0 mm

Ø 813,0 mm

DN 900

36“

Ø 914,0 mm

Ø 914,0 mm

DN 1000

40“

Ø 1016,0 mm

Ø 1016,0 mm

DN 1200

48“

Ø 1220,0 mm

Ø 1219,0 mm

DN 1400

56“

Ø 1420,0 mm

Ø 1422,0 mm

DN 1600

64“

Ø 1620,0 mm

Ø 1626,0 mm

DN 1800

72“

Ø 1820,0 mm

Ø 1829,0 mm

DN 2000

80“

Ø 2020,0 mm

Ø 2032,0 mm

DN 2200

88“

Ø 2220,0 mm

Ø 2235,0 mm

DN 2400

96“

Ø 2420,0 mm

Ø 2438,0 mm

DN 2600

104“

Ø 2620,0 mm

Ø 2620,0 mm

DN 2800

112“

Ø 2820,0 mm

Ø 2820,0 mm

DN 3000

120“

Ø 3020,0 mm

Ø 3020,0 mm

DN 3200

128“

Ø 3220,0 mm

Ø 3220,0 mm

DN 3400

136“

Ø 3420,0 mm

Ø 3420,0 mm

DN 3600

144“

Ø 3620,0 mm

Ø 3620,0 mm

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