Seamless steel pipe size and theoretical parameter comparison table

·British Seamless steel pipe

No.

NPS

Nominal

diameter

Pipe outer diameter
(mm)

Thicker wall thickness

Normal wall thickness

wall thickness
(mm)

theoretical weight
(kg/m)

wall thickness
(mm)

theoretical weight
(kg/m)

1

1/2

DN15

21.3

2.5

1.16

2.5

1.16

2

3/4

DN20

26.9

2.5

1.50

2.5

1.50

3

1

DN25

33.7

2.5

1.92

3.0

2.27

4

1 1/4

DN32

42.4

3.0

2.91

3.0

2.91

5

1 1/2

DN40

48.3

3.0

3.35

3.0

3.35

6

2

DN50

60.3

3.5

4.90

3.5

4.90

7

2 1/2

DN65

73.0

3.5

6.00

3.5

6.00

8

3

DN80

88.9

4.0

8.37

4.0

8.37

9

4

DN100

114.3

4.5

12.18

4.0

10.88

10

5

DN125

141.3

5.5

18.42

4.5

15.18

11

6

DN150

168.3

6.0

24.01

5.0

20.13

12

8

DN200

219.1

8.0

41.65

6.0

31.53

13

10

DN250

273.0

8.0

52.28

7.0

45.92

14

12

DN300

323.9

10.0

77.41

8.0

62.32

15

14

DN350

355.6

11.0

93.48

9.0

76.92

16

16

DN400

406.4

13.0

126.12

9.0

88.20

17

18

DN450

457.0

14.0

152.94

10.0

110.23

18

20

DN500

508.0

15.0

182.36

11.0

134.82

·Metric Carbon Steel Pipe

No.

NPS

Nominal

diameter

Pipe outer diameter
(mm)

Thicker wall thickness

Normal wall thickness

wall thickness
(mm)

theoretical weight
(kg/m)

wall thickness
(mm)

theoretical weight
(kg/m)

1

1/2

DN15

20

2.5

1.08

2.5

1.08

2

3/4

DN20

25

2.5

1.39

2.5

1.39

3

1

DN25

32

2.5

1.82

3.0

2.15

4

1 1/4

DN32

38

3.0

2.59

3.0

2.59

5

1 1/2

DN40

45

3.0

3.11

3.0

3.11

6

2

DN50

57

3.5

4.62

3.5

4.62

7

2 1/2

DN65

76

3.5

6.26

3.5

6.26

8

3

DN80

89

4.0

8.38

4.0

8.38

9

4

DN100

108

4.5

11.49

4.0

10.26

10

5

DN125

133

5.5

17.29

4.5

14.26

11