British Standard (BS) 3505 & 3506 : 1986

Nominal Diameter

Outside Diameter

Thickness

Inch

M.M

M.M

Class-B, 6 Bar

Class-C, 9 Bar Class-D, 12 Bar Class-E, 15 Bar

½

16

21.2-21.5

­

­

­

1.7-2.1

¾

20

26.6-26.9

­

­

­

1.9-2.5

1

25

33.4-33.7

­

­

­

2.2-2.7

30

42.1-42.4

­

­

2.2-2.7

2.7-3.2

40

48.1-48.4

­

­

2.5-3.0

3.1-3.7

2

50

60.2-60.5

­

2.5-3.0

3.1-3.7

3.9-4.5

65

75.0-75.3

­

3.0-3.5

3.9-4.5

4.8-5.5

3

75

88.7-89.1

2.9-3.4

3.5-4.1

4.6-5.3

5.7-6.6

4

100

114.1-114.5

3.4-4.0

4.5-5.2

6.0-6.9

7.3-8.4

5

125

140.0-140.4

3.8-4.4

5.5-6.4

7.3-8.4

9.0-10.4

6

150

168.0-168.5

4.5-5.2

6.6-7.6

8.8-10.2

10.8-12.5

8

200

218.8-219.4

5.3-6.1

7.8-9.0

10.3-11.9

12.6-14.5

10

250

272.6-273.4

6.6-7.6

9.7-11.2

12.8-14.8

15.7-18.1

12

300

323.4-324.3

7.8-9.0

11.5-13.3

15.2-17.5

18.7-21.6

14

355

355.0-356.0

8.5-9.8

12.6-14.5

16.7-19.2

20.5-23.6

16

400

405.9-406.9

9.7-11.2

14.5-16.7

19.0-21.9

23.4-27.0

18

450

456.7-457.7

11.0-12.7

16.3-18.8

21.4-24.6

­

20

500

507.5-508.5

12.2-14.1

18.1-20.9

­

­

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