The Standardization of Cast Iron Pipes
Nominal Size
Class
A & B
A
B
C & D
C
D
Outer Diameter (in)
Wall Thickness (in)
Internal Diameter (in)
Wall Thickness (in)
Internal Diameter (in)
Outer Diameter (in)
Wall Thickness (in)
Internal Diameter (in)
Wall Thickness (in)
Internal Diameter (in)
3
3.76
0.38
3.00
0.38
3.00
3.76
0.38
3.00
0.40
2.96
4
4.80
0.39
4.02
0.39
4.02
4.80
0.40
4.00
0.46
3.88
5
5.90
0.41
5.08
0.41
5.08
5.90
0.45
5.00
0.52
4.86
6
6.98
0.43
6.12
0.43
6.12
6.98
0.49
6.00
0.57
5.84
7
8.06
0.45
7.16
0.45
7.16
8.06
0.53
7.00
0.61
6.84
8
9.14
0.47
8.20
0.47
8.20
9.14
0.57
8.00
0.65
7.84
9
10.20
0.49
9.22
0.49
9.22
10.20
0.60
9.00
0.69
8.82
10
11.26
0.52
10.22
0.52
10.22
11.26
0.63
10.00
0.73
9.80
12
13.14
0.55
12.04
0.57
12.00
13.60
0.69
12.22
0.80
12.00
14
15.22
0.57
14.08
0.61
14.00
15.72
0.75
14.22
0.86
14.00
15
16.26
0.59
15.08
0.63
15.00
16.78
0.77
15.24
0.89
15.00
16
17.30
0.60
16.10
0.65
16.00
17.84
0.80
16.24
0.92
16.00
18
19.38
0.63
18.12
0.69
18.00
19.96
0.85
18.26
0.98
18.00
20
21.46
0.65
20.16
0.73
20.00
22.06
0.89
20.28
1.03
20.00
21
22.50
0.67
21.16
0.75
21.00
23.12
0.92
21.28
1.06
21.00
24
25.60
0.71
24.18
0.80
24.00
26.26
0.98
24.30
1.13
24.00
27
28.70
0.75
27.20
0.85
27.00
29.40
1.04
27.32
1.20
27.00
30
32.52
0.79
30.94
0.89
30.74
32.52
1.09
30.34
1.26
30.00
33
35.66
0.83
34.00
0.94
33.78
35.66
1.15
33.36
1.33
33.00
36
38.76
0.87
37.02
0.98
36.80
38.76
1.20
36.36
1.38
36.00
40
42.92
0.92
41.08
1.03
40.86
42.92
1.26
40.40
1.46
40.00
42
45.00
0.95
43.10
1.06
42.88
45.00
1.30
42.40
1.50
42.00
45
48.10
0.99
46.12
1.09
45.92
48.10
1.35
45.40
1.55
45.00
48
51.20
1.03
49.14
1.13
48.94
51.20
1.38
48.44
1.68
47.84
BS 78 was finally superseded when the U.K. harmonised with incompatible European standards, however, the specified outer dimensions continue to remain in effect (albeit in metric form) as the standard pipe outer diameter for ductile iron pipe in Australia and New Zealand through the descendant specification, AS/NZS 2280 .
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