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Ductile Iron Pipe Sizes and Dimensions

Dimensions of Ductile Iron Pipe Special Pressure Classes (customary U.S. units)

Iron Pipe per. ANSI/AWWA C150/A21.50 and ANSI/AWWA C151/A21.51

Nominal sizea (in)	Outside Diameter (in)	Minimum wall thickness (in) special pressure classb
		50	51	52	53	54	55	56
4	4.80	–	0.26	0.29	0.32	0.35	0.38	0.41
6	6.90	0.25	0.28	0.31	0.34	0.37	0.40	0.43
8	9.05	0.27	0.30	0.33	0.36	0.39	0.42	0.45
10	11.10	0.29	0.32	0.35	0.38	0.41	0.44	0.47
12	13.20	0.31	0.34	0.37	0.40	0.43	0.46	0.49
14	15.30	0.33	0.36	0.39	0.42	0.45	0.48	0.51
16	17.40	0.34	0.37	0.40	0.43	0.46	0.49	0.52
18	19.50	0.35	0.38	0.41	0.44	0.47	0.50	0.53
20	21.60	0.36	0.39	0.42	0.45	0.48	0.51	0.54
24	25.80	0.38	0.41	0.44	0.47	0.50	0.53	0.56
30	32.00	0.39	0.43	0.47	0.51	0.55	0.59	0.63
36	38.30	0.43	0.48	0.53	0.58	0.63	0.68	0.73
36	38.30	0.43	0.48	0.53	0.58	0.63	0.68	0.73
48	50.80	0.51	0.58	0.65	0.72	0.79	0.86	0.93
54	57.56	0.57	0.65	0.73	0.81	0.89	0.97	1.05

(Multiply in by 25.4 to obtain mm.)
(Multiply lbf/in² by 6.895 to obtain kPa.)
^aFormerly designated “standard thickness classes.” These special pressure classes are as shown in AWWA C150 and C151. Special classes are most appropriate for some threaded, grooved, or ball and socket pipes, or for extraordinary design conditions. They are generally less available than standard pressure class pipe.
^b60 in (1500 mm) and 64 in (1600 mm) pipe sizes are not available in special pressure classes.

Reference

ANSI/AWWA C150/A21.50 and ANSI/AWWA C151/A21.51

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