Nominal Pipe Size	O.D.	Average I.D.	Min. Wall	Nominal wt./ft.	Maximum W.P PSI
1/8"	.405	.249	.068	.051	810
1/4"	.540	.344	.088	.086	780
3/8"	.675	.473	.091	.115	620
1/2"	.840	.602	.109	.170	600
3/4"	1.050	.804	.113	.226	480
1"	1.315	1.029	.133	.333	450
1-1/4"	1.660	1.360	.140	.450	370
1-1/2"	1.900	1.590	.145	.537	330
2"	2.375	2.047	.154	.720	280
2-1/2"	2.875	2.445	.203	1.136	300
3"	3.500	3.042	.216	1.488	260
3-1/2"	4.000	3.521	.226	1.789	240
4"	4.500	3.998	.237	2.188	220
5"	5.563	5.016	.258	2.874	190
6"	6.625	6.031	.280	3.733	180
8"	8.625	7.942	.322	5.619	160
10"	10.750	9.976	.365	7.966	140
12"	12.750	11.889	..406	10.534	130
14"	14.000	13.073	.437	12.462	130
16"	16.000	14.940	.500	16.286	130
18"	18.000	16.809	.562	20.587	130
20"	20.000	18.743	.593	24.183	120
24"	24.000	22.544	.687	33.652	120