Steel Pipe

Pipe On The Same Order As Your Flanges

Texas Flange has supplied pipe flanges since 1986, and the pipe they weld to comes from the same counter. Carbon, stainless and alloy steel pipe ships with your flanges, butt weld fittings, gaskets and stud bolts, so one purchase order covers the whole line.

Pipe is supplied seamless or welded, with mill test reports (MTRs) available. The schedule chart below gives the outside diameter, wall thickness, inside diameter and weight per foot for every common size and schedule, to ASME B36.10M.

Pipe We Supply

Carbon Steel Pipe

Seamless and welded carbon steel pipe to ASTM A106, A53 and API 5L, the grades that pair with A105 flanges and A234 WPB fittings.

Stainless Steel Pipe

Seamless and welded stainless pipe to ASTM A312 in 304/304L and 316/316L, to match A182 stainless flanges and A403 fittings.

Alloy & Low-Temperature Pipe

Chrome-moly pipe to ASTM A335 and low-temperature carbon pipe to A333, for the same services as our F11, F22 and LF2 flanges.

Need the fittings and flanges for the same line? See butt weld fittings, weld neck flanges and the weld neck flange bore chart.

Pipe Schedule Chart

Dimensions in inches to ASME B36.10M. Weight is the calculated plain-end weight of carbon steel pipe in pounds per foot; stainless runs about 2% heavier.

Schedule STD

Nom. Pipe Size	Outside Diameter O.D.	Wall Thickness T	Inside Diameter I.D.	Weight (lb/ft)
½	0.840	0.109	0.622	0.85
¾	1.050	0.113	0.824	1.13
1	1.315	0.133	1.049	1.68
1¼	1.660	0.140	1.380	2.27
1½	1.900	0.145	1.610	2.72
2	2.375	0.154	2.067	3.66
2½	2.875	0.203	2.469	5.80
3	3.500	0.216	3.068	7.58
3½	4.000	0.226	3.548	9.12
4	4.500	0.237	4.026	10.80
5	5.563	0.258	5.047	14.63
6	6.625	0.280	6.065	18.99
8	8.625	0.322	7.981	28.58
10	10.750	0.365	10.020	40.52
12	12.750	0.375	12.000	49.61
14	14.000	0.375	13.250	54.62
16	16.000	0.375	15.250	62.64
18	18.000	0.375	17.250	70.65
20	20.000	0.375	19.250	78.67
24	24.000	0.375	23.250	94.71
30	30.000	0.375	29.250	118.76
36	36.000	0.375	35.250	142.81
42	42.000	0.375	41.250	166.86
48	48.000	0.375	47.250	190.92

Schedule XS

Nom. Pipe Size	Outside Diameter O.D.	Wall Thickness T	Inside Diameter I.D.	Weight (lb/ft)
½	0.840	0.147	0.546	1.09
¾	1.050	0.154	0.742	1.48
1	1.315	0.179	0.957	2.17
1¼	1.660	0.191	1.278	3.00
1½	1.900	0.200	1.500	3.63
2	2.375	0.218	1.939	5.03
2½	2.875	0.276	2.323	7.67
3	3.500	0.300	2.900	10.26
3½	4.000	0.318	3.364	12.52
4	4.500	0.337	3.826	15.00
5	5.563	0.375	4.813	20.80
6	6.625	0.432	5.761	28.60
8	8.625	0.500	7.625	43.43
10	10.750	0.500	9.750	54.79
12	12.750	0.500	11.750	65.48
14	14.000	0.500	13.000	72.16
16	16.000	0.500	15.000	82.85
18	18.000	0.500	17.000	93.54
20	20.000	0.500	19.000	104.23
24	24.000	0.500	23.000	125.61
30	30.000	0.500	29.000	157.68
36	36.000	0.500	35.000	189.75
42	42.000	0.500	41.000	221.82
48	48.000	0.500	47.000	253.89

Schedule 40

Nom. Pipe Size	Outside Diameter O.D.	Wall Thickness T	Inside Diameter I.D.	Weight (lb/ft)
½	0.840	0.109	0.622	0.85
¾	1.050	0.113	0.824	1.13
1	1.315	0.133	1.049	1.68
1¼	1.660	0.140	1.380	2.27
1½	1.900	0.145	1.610	2.72
2	2.375	0.154	2.067	3.66
2½	2.875	0.203	2.469	5.80
3	3.500	0.216	3.068	7.58
3½	4.000	0.226	3.548	9.12
4	4.500	0.237	4.026	10.80
5	5.563	0.258	5.047	14.63
6	6.625	0.280	6.065	18.99
8	8.625	0.322	7.981	28.58
10	10.750	0.365	10.020	40.52
12	12.750	0.406	11.938	53.57
14	14.000	0.438	13.124	63.50
16	16.000	0.500	15.000	82.85
18	18.000	0.562	16.876	104.76
20	20.000	0.594	18.812	123.23
24	24.000	0.688	22.624	171.45

Schedule 80

Nom. Pipe Size	Outside Diameter O.D.	Wall Thickness T	Inside Diameter I.D.	Weight (lb/ft)
½	0.840	0.147	0.546	1.09
¾	1.050	0.154	0.742	1.48
1	1.315	0.179	0.957	2.17
1¼	1.660	0.191	1.278	3.00
1½	1.900	0.200	1.500	3.63
2	2.375	0.218	1.939	5.03
2½	2.875	0.276	2.323	7.67
3	3.500	0.300	2.900	10.26
3½	4.000	0.318	3.364	12.52
4	4.500	0.337	3.826	15.00
5	5.563	0.375	4.813	20.80
6	6.625	0.432	5.761	28.60
8	8.625	0.500	7.625	43.43
10	10.750	0.594	9.562	64.49
12	12.750	0.688	11.374	88.71
14	14.000	0.750	12.500	106.23
16	16.000	0.844	14.312	136.74
18	18.000	0.938	16.124	171.08
20	20.000	1.031	17.938	209.06
24	24.000	1.219	21.562	296.86

Schedule 160

Nom. Pipe Size	Outside Diameter O.D.	Wall Thickness T	Inside Diameter I.D.	Weight (lb/ft)
½	0.840	0.188	0.464	1.31
¾	1.050	0.219	0.612	1.95
1	1.315	0.250	0.815	2.85
1¼	1.660	0.250	1.160	3.77
1½	1.900	0.281	1.338	4.86
2	2.375	0.344	1.687	7.47
2½	2.875	0.375	2.125	10.02
3	3.500	0.438	2.624	14.34
4	4.500	0.531	3.438	22.53
5	5.563	0.625	4.313	32.99
6	6.625	0.719	5.187	45.39
8	8.625	0.906	6.813	74.76
10	10.750	1.125	8.500	115.75
12	12.750	1.312	10.126	160.42
14	14.000	1.406	11.188	189.29
16	16.000	1.594	12.812	245.48
18	18.000	1.781	14.438	308.79
20	20.000	1.969	16.062	379.53
24	24.000	2.344	19.312	542.64

Schedule XXS

Nom. Pipe Size	Outside Diameter O.D.	Wall Thickness T	Inside Diameter I.D.	Weight (lb/ft)
½	0.840	0.294	0.252	1.72
¾	1.050	0.308	0.434	2.44
1	1.315	0.358	0.599	3.66
1¼	1.660	0.382	0.896	5.22
1½	1.900	0.400	1.100	6.41
2	2.375	0.436	1.503	9.04
2½	2.875	0.552	1.771	13.71
3	3.500	0.600	2.300	18.60
4	4.500	0.674	3.152	27.57
5	5.563	0.750	4.063	38.59
6	6.625	0.864	4.897	53.21
8	8.625	0.875	6.875	72.49
10	10.750	1.000	8.750	104.23
12	12.750	1.000	10.750	125.61

Other schedules, including 10, 20, 30, 60, 100, 120, 140 and the stainless 5S through 80S, are available on request.

Steel Pipe, Explained

What does pipe schedule mean?

The schedule number sets the wall thickness for a given nominal pipe size. The outside diameter stays the same for every schedule of one size, so a heavier schedule has a thicker wall and a smaller bore. Schedule 40 and 80 are the most common; STD, XS and XXS are the older weight classes that sit alongside them.

Is Schedule 40 the same as STD?

Up to and including NPS 10, yes: Schedule 40 and STD have the same wall. From NPS 12 up, STD stays at 0.375″ while Schedule 40 keeps getting heavier, so the two part ways. Schedule 80 and XS follow the same pattern up to NPS 8. Check the chart before treating them as the same thing on a spec.

What is the difference between nominal pipe size and outside diameter?

Nominal pipe size (NPS) is a name, not a measurement. From NPS 1/8 through 12 the actual outside diameter is larger than the nominal size, so 2″ pipe is 2.375″ OD. From NPS 14 up, the outside diameter equals the nominal size.

Should I specify seamless or welded pipe?

Seamless pipe has no longitudinal weld, which is why it is the usual choice for high pressure, high temperature and cyclic service. Welded pipe costs less and is widely used for lower pressure and larger diameters. The piping code and service conditions on your job decide which one is allowed.

Can I order pipe on the same order as my flanges?

Yes. Texas Flange supplies pipe alongside its flanges, butt weld fittings, gaskets, stud bolts and nuts, so one purchase order covers the whole line. Mill test reports (MTRs) are available. Send the size, schedule, specification, grade and length, and we will quote it with the rest of the order.