Pipe Schedule Chart

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Wall thickness of pipes is referred to as pipe schedules.

The wall thickness associated with a particular schedule depends on the pipe size. Refer to the chart below to determine the schedule of your pipe.

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PIPE SCHEDULING CHART Pipe Size, pipe schedule number, diameter, wall thickness, working pressure ANSI B36.10 and ANSI B36.19
Nom. Size (in)	O.D. (in)	Schedule Number or Weight	Wall Thickness (in)	Inside Diameter (in)	Pipe Weight (lbs/ft)	Working Pressure at 400F (psig)
1/4	0.540	40ST	0.088	0.364	0.424	188
1/4	0.540	80XS	0.119	0.302	0.535	871
3/8	0.675	40ST	0.091	0.493	0.567	203
3/8	0.675	80XS	0.126	0.423	0.738	820
1/2	0.840	40ST	0.109	0.622	0.850	214
1/2	0.840	80XS	0.147	0.546	1.087	753
3/4	1.050	40ST	0.113	0.824	1.13	217
3/4	1.050	80XS	0.154	0.742	1.47	681
1	1.315	40ST	0.133	1.049	1.68	226
1	1.315	80XS	0.179	0.957	2.17	642
1-1/4	1.660	40ST	0.140	1.380	2.27	229
1-1/4	1.660	80XS	0.191	1.278	2.99	594
1-1/2	1.900	40ST	0.145	1.610	2.72	231
1-1/2	1.900	80XS	0.200	1.500	3.63	576
2	2.375	40ST	0.154	2.067	3.65	230
2	2.375	80XS	0.218	1.939	5.02	551
2-1/2	2.875	40ST	0.203	2.469	5.79	533
2-1/2	2.875	80XS	0.276	2.323	7.66	835
3	3.500	40ST	0.216	3.068	7.57	482
3	3.500	80XS	0.300	2.900	10.25	767
4	4.500	40ST	0.237	4.026	10.78	430
4	4.500	80XS	0.337	3.826	14.97	695

Nom. Size (in)	O.D. (in)	Schedule Number or Weight	Wall Thickness (in)	Inside Diameter (in)	Pipe Weight (lbs/ft)	Working Pressure at 400F (psig)
6	6.625	40ST	0.280	6.065	18.96	696
6	6.625	80XS	0.432	5.761	28.55	1209
8	8.625	30	0.277	8.071	24.68	526
8	8.625	40ST	0.322	7.981	28.53	643
8	8.625	80XS	0.500	7.625	43.35	1106
10	10.75	30	0.307	10.136	34.21	485
10	10.75	40ST	0.365	10.202	40.45	606
10	10.75	XS	0.500	9.750	54.69	887
10	10.75	80	0.593	9.564	64.28	1018
12	12.75	30	0.330	12.090	43.74	449
12	12.75	ST	0.375	12.000	49.52	528
12	12.75	40	0.406	11.938	53.48	583
12	12.75	XS	0.500	11.750	65.37	748
12	12.75	80	0.687	11.376	88.44	1076
14	14.00	30ST	0.375	13.250	54.53	481
14	14.00	40	0.437	13.126	63.25	580
14	14.00	XS	0.500	13.000	72.04	681
14	14.00	80	0.750	12.500	106.05	1081
16	16.00	30ST	0.375	15.250	62.53	421
16	16.00	40XS	0.500	15.000	82.71	596
18	18.00	ST	0.375	17.250	70.54	374
18	18.00	30	0.437	17.126	81.91	451
18	18.00	XS	0.500	17.000	93.38	530
18	18.00	40	0.562	16.876	104.59	607
20	20.00	20ST	0.375	19.250	78.54	337
20	20.00	30XS	0.500	19.000	104.05	477
20	20.00	40	0.593	18.814	122.82	581

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Pipe Schedule Chart

Free Pipe Marking Best Practices Guide Insight into Pipe Schedule Labeling

PIPE SCHEDULING CHART

Pipe Size, pipe schedule number, diameter, wall thickness, working pressure ANSI B36.10 and ANSI B36.19

Free Pipe Marking Best Practices Guide
Insight into Pipe Schedule Labeling