Ductile Iron Pipe Dimensions in North America - Knowledge - Shanxi Ever Better Industrial Co., Ltd

AWWA C-151 governs the dimensions of ductile iron pipes in North America. Typical dimensions of centrifugally cast ductile-iron pipes according to AWWA C151/A.21.51 is provided below in a chart format:

Nominal Size	Outside Diameter	Pressure Class					Outside Diameter	Pressure Class
(inches)	(inches)	150	200	250	300	350	(mm)	150	200	250	300	350
		Wall Thickness (inches)						Wall Thickness (mm)
3	3.96	0.25	0.25	0.25	0.25	0.25	101	6.35	6.35	6.35	6.35	6.35
4	4.8	0.26	0.26	0.26	0.26	0.26	122	6.6	6.6	6.6	6.6	6.6
6	6.9	0.25	0.25	0.25	0.25	0.25	175	6.35	6.35	6.35	6.35	6.35
8	9.05	0.27	0.27	0.27	0.27	0.27	230	6.86	6.86	6.86	6.86	6.86
10	11.1	0.29	0.29	0.29	0.29	0.29	282	7.37	7.37	7.37	7.37	7.37
12	13.2	0.31	0.31	0.31	0.31	0.31	335	7.87	7.87	7.87	7.87	7.87
14	15.3	0.33	0.33	0.33	0.33	0.33	389	8.38	8.38	8.38	8.38	8.38
16	17.4	0.34	0.34	0.34	0.34	0.34	442	8.64	8.64	8.64	8.64	8.64
18	19.5	0.35	0.35	0.35	0.35	0.35	495	8.89	8.89	8.89	8.89	8.89
20	21.6	0.36	0.36	0.36	0.36	0.39	549	9.14	9.14	9.14	9.14	9.14
24	25.8	0.38	0.38	0.38	0.41	0.44	655	9.65	9.65	9.65	10.4	11.2
30	32	0.39	0.39	0.43	0.47	0.51	813	9.91	9.91	10.9	11.9	13
36	38.3	0.43	0.43	0.48	0.53	0.58	973	10.9	10.9	12.2	13.5	14.7
42	44.5	0.47	0.47	0.53	0.59	0.65	1130	11.9	11.9	13.5	15	16.5
48	50.8	0.51	0.51	0.58	0.65	0.72	1290	13	13	14.7	16.5	18.3
54	57.56	0.57	0.57	0.65	0.73	0.81	1462	14.5	14.5	16.5	18.5	20.6
60	61.61	0.54	0.61	0.68	0.76	0.83	1565	13.7	15.5	17.3	19.3	21.1
64	65.67	0.56	0.64	0.72	0.80	0.87	1668	14.2	16.3	18.3	20.3	22.1

The pressure class in the above table for ductile iron pipe dimension is the rated water pressure that the pipe can withstand in psi. The thicknesses shown in the above table are adequate for the rated water working pressure plus a surge allowance of 100 psi. Thickness calculations are based on the minimum yield strength of 42,000 psi and a safety factor of 2.0 times the sum of the working pressure and 100 psi surge allowance.