The inside diameter of ductile iron pipe averages 8.25% larger than the inside diameter of most other pipes. The calculations for flow should include the larger inside diameters of ductile iron pipe.
The Manning “n” and the Hazen-Williams “C Factor” for Protecto 401 Ceramic Epoxy lined ductile iron pipe is equal to or better than cement mortar lined ductile pipe which is:
- 1.Manning “n” (open channel or partially-full sewers) = .011
- 2.C-Factor (full-flowing pressure pipe) = 140
The inside diameter of ductile iron pipe lined with the standard thickness (0.040 in. nominal) of Protecto 401 Ceramic Epoxy is listed below:
|
Size (in.) |
Outside* |
Thickness Class 50 |
Thickness Class 52 |
|
6 |
6.90 |
6.32 |
6.20 |
|
8 |
9.05 |
8.43 |
8.31 |
|
10 |
11.10 |
10.44 |
10.32 |
|
12 |
13.20 |
12.50 |
12.38 |
|
14 |
15.30 |
14.56 |
14.44 |
|
16 |
17.40 |
16.64 |
16.52 |
|
18 |
19.50 |
18.72 |
18.60 |
|
20 |
21.60 |
20.80 |
20.68 |
|
24 |
25.80 |
24.96 |
24.84 |
|
30 |
32.00 |
31.14 |
30.98 |
|
36 |
38.30 |
37.36 |
37.16 |
|
42 |
44.50 |
43.48 |
43.24 |
|
48 |
50.80 |
49.70 |
49.42 |
|
54 |
57.56 |
56.34 |
56.02 |
|
|
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*NOTE: Tolerances per ANSI/AWWAC151/A21.51 |
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