Outer diame
-ter
of co
-pper tube(
in.)

Outer
diame
-ter
of seam
-less tube
(mm)

Nomi-
nal d
-iame
ter o
-f ga
-lvan
-ized
tube

lnner
diame
-ter
of Hu
-mei
rubbe
(mm)

9mm thick
(1.8m/piece)

15mm thick
(2m/piece)

20mm thick
(2m/piece)

25mm thick
(2m/piece)

30mm thick
(2m/piece)

size
(mm×mm)

piece

piece

size
(mm×mm)

Plece

size
(mm×mm)

Plece

size
(mm×mm)

Plece

size
(mm×mm)

Plece

1/4

6

 6×9

180

180

3/8

6

10

10×9

140

140

10×15

80

10×20

70

1/2

13

13×9

120

100

13×15

80

13×20

50

5/8

14

8

16

16×9

100

95

16×15

60

16×20

50

3/4

19

19×9

100

80

19×15

60

19×20

40

7/8

22

15

22

22×9

100

70

22×15

60

22×20

40

22×25

30

22×30

25

1

25

25

25×9

80

55

11/8

28

20

28

28×9

60

50

28×15

50

28×20

30

28×25

25

28×30

20

11/4

32

32

32×9

60

45

11/4

32

34

34×15

40

34×20

30

34×25

25

34×30

20

13/8

25

35

35×9

60

40

15/8

32

42

42×9

50

30

15/8

32

43

43×15

30

43×20

25

43×25

20

43×30

15

17/8

40

48

48×9

50

28

48×15

30

48×20

25

48×25

20

48×30

15

21/8

54

54×9

50

25

23/8

50

60

60×9

50

20

60×15

30

60×20

20

60×25

15

60×30

15

76

70

76

76×15

25

76×20

15

76×25

15

76×30

10

89

80

89

89×20

15

89×25

15

89×30

10

108

108

108×20

15

108×25

10

108×30

10

Notes:
1.The above specifications are those in common use ; specifications are available on customer request.
2.Planking and tubing are normally in black. Other colors are available on customer request.
3.It is recommended to use planking where outer diameter of tubing exceeds 89mm.
4.Multilayer packing is recommended where the thickness of heat insulation materials needs to be greater than 25mm.