Seam Welded Steel Pipes BS 1387 (BS EN 10255)



Light, Medium & Heavy series are available from these standards (Galvanized & Black) suitable for water lines (Cold & Hot), Gas lines, Fire Fighting, HVAC lines & Electric Poles. Pipes can be supplied threaded according to BS 21.

BS 1387-85

Class

Nominal Diameter (DN) mm

Designation of thread Inch

Outside diameter

Thickness mm

Mass of black tube

Max mm Min mm

Plain end kg/m

Screwed and socketed kg/m

Light

15

½

21.4

21.0

2.0

0.947

0.956

20

¾

26.9

26.4

2.3

1.38

1.39

25

1

33.8

33.2

2.6

1.98

2.00

32

42.5

41.9

2.6

2.54

2.57

40

48.4

47.8

2.9

3.23

3.27

50

2

60.2

59.60

2.9

4.08

4.15

65

76.0

75.2

3.2

5.74

5.83

80

3

88.7

87.9

3.2

6.72

6.89

100

4

113.9

113.0

3.6

9.75

10.0

Medium

15

½

21.7

21.1

2.6

1.21

1.22

20

¾

27.2

26.6

2.6

1.56

1.57

25

1

34.2

33.4

3.2

2.41

2.43

32

42.9

42.1

3.2

3.10

3.13

40

48.8

48.0

3.2

3.57

3.61

50

2

60.8

59.8

3.6

5.03

5.10

65

76.6

75.4

3.6

6.43

6.55

80

3

89.5

88.1

4.0

8.37

8.54

100

4

114.9

113.3

4.5

12.2

12.5

125

5

140.6

138.7

5.0

16.6

17.1

150

6

166.1

164.1

5.0

19.7

20.3

Heavy

15

½

21.7

21.1

3.2

1.44

1.45

20

¾

27.2

26.6

3.2

1.87

1.88

25

1

34.2

33.4

4.0

2.94

2.96

32

42.9

42.1

4.0

3.80

3.83

40

48.8

48.0

4.0

4.38

4.42

50

2

60.8

59.8

4.5

6.19

6.26

65

76.6

75.4

4.5

7.93

8.05

80

3

89.5

88.1

5.0

10.3

10.5

100

4

114.9

113.3

5.4

14.5

14.8

125

5

140.6

138.7

5.4

17.9

18.4

150

6

166.1

164.1

5.4

21.3

21.9

NOTES: 1) Dimensions and masses are accordance with ISO R65           

              2) Hydrostatic test pressure 50 kg/cm²


 

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