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FLOW CHARACTERISTICS OF
PROTECTO 401 CERAMIC EPOXY LINED
DUCTILE IRON PIPE

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*
Diameter (in.) 		Thickness Class 50
Inside*
Diameter (in.)
 Thickness Class 52
Inside*
Diameter (in.)
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
*Note: Tolerances per ANSI/AWWAC151/A21.51

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