Pipe Schedule

Standard Pipe Schedule or Pipes Sizes according to ANSI / ASME B36.10M and API 5L .

ANSI – American National Standards Institute
ASME – American Society of Mechanical Engineers
API = American Petroleum Institute
ASME/ANSI B 36.10 Welded Steel Pipe and Seamless Wrought Steel Pipe
ASME/ANSI B36.19 Stainless Steel Pipe

Pipe Schedule

Standard Pipe Schedule or Nomimal Pipes Size according to ASME B36.10M and ASME B 36.19 in mm

NPS	DN	OD inch	OD mm	SCH5S mm	SCH10S mm	SCH10 mm	SCH20 mm	SCH30 mm	STD mm	SCH40S mm	SCH40 mm	SCH60 mm	XS mm	SCH80S mm	SCH80 mm	SCH100 mm	SCH120 mm	SCH140 mm	SCH160 mm	XXS mm
1/8	6	0.405	10.3		1.24	1.24		1.45	1.73	1.73	1.73		2.41	2.41	2.41
1/4	8	0.540	13.7		1.65	1.65		1.85	2.24	2.24	2.24		3.02	3.02	3.02
3/8	10	0.675	17.1		1.65	1.65		1.85	2.31	2.31	2.31		3.20	3.20	3.20
1/2	15	0.840	21.3	1.65	2.11	2.11		2.41	2.77	2.77	2.77		3.73	3.73	3.73				4.78	7.47
3/4	20	1.050	26.7	1.65	2.11	2.11		2.41	2.87	2.87	2.87		3.91	3.91	3.91				5.56	7.82
1	25	1.315	33.4	1.65	2.77	2.77		2.90	3.38	3.38	3.38		4.55	4.55	4.55				6.35	9.09
1-1/4	32	1.660	42.2	1.65	2.77	2.77		2.97	3.56	3.56	3.56		4.85	4.85	4.85				6.35	9.70
1-1/2	40	1.900	48.3	1.65	2.77	2.77		3.18	3.68	3.68	3.68		5.08	5.08	5.08				7.14	10.15
2	50	2.375	60.3	1.65	2.77	2.77		3.18	3.91	3.91	3.91		5.54	5.54	5.54				8.74	11.07
2-1/2	65	2.875	73	2.11	3.05	3.05		4.78	5.16	5.16	5.16		7.01	7.01	7.01				9.53	14.02
3	80	3.500	88.9	2.11	3.05	3.05		4.78	5.49	5.49	5.49		7.62	7.62	7.62				11.13	15.24
3-1/2	90	4.000	101.6	2.11	3.05	3.05		4.78	5.74	5.74	5.74		8.08	8.08	8.08
4	100	4.500	114.3	2.11	3.05	3.05		4.78	6.02	6.02	6.02		8.56	8.56	8.56		11.13		13.49	17.12
5	125	5.563	141.3	2.77	3.40	3.40			6.55	6.55	6.55		9.53	9.53	9.53		12.70		15.88	19.05
6	150	6.625	168.3	2.77	3.40	3.40			7.11	7.11	7.11		10.97	10.97	10.97		14.27		18.26	21.95
8	200	8.625	219.1	2.77	3.76	3.76	6.35	7.04	8.18	8.18	8.18	10.31	12.70	12.70	12.70	15.09	18.26	20.62	23.01	22.23
10	250	10.750	273.0	3.40	4.19	4.19	6.35	7.80	9.27	9.27	9.27	12.70	12.70	12.70	15.09	18.26	21.44	25.40	28.58	25.40
12	300	12.750	323.8	3.96	4.57	4.57	6.35	8.38	9.53	9.53	10.31	14.27	12.70	12.70	17.48	21.44	25.40	28.58	33.32	25.40
14	350	14.000	355.6	3.96	4.78	6.35	7.92	9.53	9.53	9.53	11.13	15.09	12.70	12.70	19.05	23.83	27.79	31.75	35.71
16	400	16.000	406.4	4.19	4.78	6.35	7.92	9.53	9.53	9.53	12.70	16.66	12.70	12.70	21.44	26.19	30.96	36.53	40.49
18	450	18.000	457.2	4.19	4.78	6.35	7.92	11.13	9.53	9.53	14.27	19.05	12.70	12.70	23.83	29.36	34.93	39.67	45.24
20	500	20.000	508	4.78	5.54	6.35	9.53	12.70	9.53	9.53	15.09	20.62	12.70	12.70	26.19	32.54	38.10	44.45	50.01
22	550	22.000	558.8	4.78	5.54	6.35	9.53	12.70	9.53			22.23	12.70		28.58	34.93	41.28	47.63	53.98
24	600	24.000	609.6	5.54	6.35	6.35	9.53	14.27	9.53	9.53	17.48	24.61	12.70	12.70	30.96	38.89	46.02	52.37	59.54
26	650	26.000	660.4			7.92	12.70		9.53				12.70
28	700	28.000	711.2			7.92	12.70	15.88	9.53				12.70
30	750	30.000	762	6.35	7.92	7.92	12.70	15.88	9.53				12.70
32	800	32.000	812.8			7.92	12.70	15.88	9.53		17.48		12.70
34	850	34.000	863.6			7.92	12.70	15.88	9.53		17.48		12.70
36	900	36.000	914.4			7.92	12.70	15.88	9.53		19.05		12.70
38	950	38.000	965.2						9.53				12.70
40	1000	40.000	1016						9.53				12.70
42	1050	42.000	1066.8						9.53				12.70

Standard Pipe Schedule or Nomimal Pipes Size according to ASME B36.10M and ASME B 36.19 in inch

Nominal Pipe Size 1/8 to Nominal Pipe Size 3½

Nominal Pipe Size	DN mm	OD inches(mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)
—	—	—	SCH 5	SCH 10	SCH 30	SCH 40/STD	SCH 80	SCH 120	SCH 160	XXS
⅛	6	0.405 in (10.29 mm)	0.035 in (0.889 mm)	0.049 in (1.245 mm)	0.057 in (1.448 mm)	0.068 in (1.727 mm)	0.095 in (2.413 mm)	—	—	—
¼	8	0.540 in (13.72 mm)	0.049 in (1.245 mm)	0.065 in (1.651 mm)	0.073 in (1.854 mm)	0.088 in (2.235 mm)	0.119 in (3.023 mm)	—	—	—
⅜	10	0.675 in (17.15 mm)	0.049 in (1.245 mm)	0.065 in (1.651 mm)	0.073 in (1.854 mm)	0.091 in (2.311 mm)	0.126 in (3.200 mm)	—	—	—
½	15	0.840 in (21.34 mm)	0.065 in (1.651 mm)	0.083 in (2.108 mm)	—	0.109 in (2.769 mm)	0.147 in (3.734 mm)	—	4.78mm	0.294 in (7.47 mm)
¾	20	1.050 in (26.67 mm)	0.065 in (1.651 mm)	0.083 in (2.108 mm)	2.41mm	0.113 in (2.870 mm)	0.154 in (3.912 mm)	—	5.56mm	0.308 in (7.823 mm)
1	25	1.315 in (33.40 mm)	0.065 in (1.651 mm)	0.109 in (2.769 mm)	2.90mm	0.133 in (3.378 mm)	0.179 in (4.547 mm)	—	6.35mm	0.358 in (9.093 mm)
1-¼	32	1.660 in (42.16 mm)	0.065 in (1.651 mm)	0.109 in (2.769 mm)	0.117 in (2.972 mm)	0.140 in (3.556 mm)	0.191 in (4.851 mm)	—	6.35mm	0.382 in (9.703 mm)
1-½	40	1.900 in (48.26 mm)	0.065 in (1.651 mm)	0.109 in (2.769 mm)	0.125 in (3.175 mm)	0.145 in (3.683 mm)	0.200 in (5.080 mm)	—	7.14mm	0.400 in (10.160 mm)
2	50	2.375 in (60.33 mm)	0.065 in (1.651 mm)	0.109 in (2.769 mm)	0.125 in (3.175 mm)	0.154 in (3.912 mm)	0.218 in (5.537 mm)	0.250 in (6.350 mm)	8.74mm	0.436 in (11.074 mm)
2-½	65	2.875 in (73.02 mm)	0.083 in (2.108 mm)	0.120 in (3.048 mm)	0.188 in (4.775 mm)	0.203 in (5.156 mm)	0.276 in (7.010 mm)	0.300 in (7.620 mm)	0.344 in (8.738 mm)	0.552 in (14.021 mm)
3	80	3.500 in (88.90 mm)	0.083 in (2.108 mm)	0.120 in (3.048 mm)	0.188 in (4.775 mm)	0.216 in (5.486 mm)	0.300 in (7.620 mm)	0.350 in (8.890 mm)	0.438 in (11.13 mm)	0.600 in (15.240 mm)
3-½	90	4.000 in (101.60 mm)	0.083 in (2.108 mm)	0.120 in (3.048 mm)	0.188 in (4.775 mm)	0.226 in (5.740 mm)	0.318 in (8.077 mm)	—	—	0.636 in (16.154 mm)

Nominal Pipe Size 4 to Nominal Pipe Size 9

NPS

DN
mm

OD
inches (mm)

WT
inches (mm)

—

SCH 5

SCH 10

SCH 20

SCH 30

SCH 40/STD

SCH 60

SCH 80

SCH 100

SCH 120

SCH 140

SCH 160

100

4.500 in (114.30 mm)

0.083 in (2.108 mm)

0.120
in
(3.
048 mm)

—

0.188
in
(4.
775 mm)

0.237 in (6.02 mm)

0.281
in (7.137 mm)

0.337 in (8.560 mm)

—

0.437
in (11.13 mm)

—

0.531
in (13.49 mm)

4-½

115

5.000 in (127.00 mm)

—

0.247 in (6.274 mm)

—

0.355 in (9.017 mm)

—

125

5.563 in (141.30 mm)

0.109 in (2.769 mm)

0.134
in
(3.404 mm)

—

0.258 in (6.553 mm)

—

0.375 in (9.525 mm)

—

0.500
in (12.70 mm)

—

0.625
in (15.875 mm)

150

6.625 in (168.27 mm)

0.109 in (2.769 mm)

0.134
in (3.404 mm)

—

0.280 in (7.112 mm)

—

0.432 in (10.973 mm)

—

0.562
in (14.27 mm)

—

0.719
in (18.263 mm)

200

8.625 in (219.08 mm)

0.109 in (2.769 mm)

0.148
in (3.759 mm)

0.250
in
(6.
35 mm)

0.277
in
(7.
036 mm)

0.322 in (8.179 mm)

0.406
in
(10.
312 mm)

0.500 in (12.70 mm)

0.593
in
(15.
09 mm)

0.718
in (18.2 6mm)

0.812
in
(20.
62mm)

0.906
in (23.01 mm)

Nominal Pipe Size10 to Nominal Pipe Size 24

Nominal Pipe Size	DN mm	OD inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)
—	—	—	SCH 5s	SCH 5	SCH 10s	SCH 10	SCH 20	SCH 30
10	250	10.75 in (273.05 mm)	0.134 in (3.404 mm)	0.134 in (3.404 mm)	0.165 in (4.191 mm)	0.165 in (4.191 mm)	0.250 in (6.350 mm)	0.307 in (7.798 mm)
12	300	12.75 in (323.85 mm)	0.156 in (3.962 mm)	0.165 in (4.191 mm)	0.180 in (4.572 mm)	0.180 in (4.572 mm)	0.250 in (6.350 mm)	0.330 in (8.382 mm)
14	350	14.00 in (355.60 mm)	0.156 in (3.962 mm)	0.156 in (3.962 mm)	0.188 in (4.775 mm)	0.250 in (6.350 mm)	0.312 in (7.925 mm)	0.375 in (9.525 mm)
16	400	16.00 in (406.40 mm)	0.165 in (4.191 mm)	0.165 in (4.191 mm)	0.188 in (4.775 mm)	0.250 in (6.350 mm)	0.312 in (7.925 mm)	0.375 in (9.525 mm)
18	450	18.00 in (457.20 mm)	0.165 in (4.191 mm)	0.165 in (4.191 mm)	0.188 in (4.775 mm)	0.250 in (6.350 mm)	0.312 in (7.925 mm)	0.437 in (11.100 mm)
20	500	20.00 in (508.00 mm)	0.188 in (4.775 mm)	0.188 in (4.775 mm)	0.218 in (5.537 mm)	0.250 in (6.350 mm)	0.375 in (9.525 mm)	0.500 in (12.700 mm)
24	600	24.00 in (609.60 mm)	0.218 in (5.537 mm)	0.218 in (5.537 mm)	0.250 in (6.350 mm)	0.250 in (6.350 mm)	0.375 in (9.525 mm)	0.562 in (14.275 mm)

Nominal Pipe Size	WT inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)	WT inches (mm)
—	SCH 40s	SCH 40	SCH 60	SCH 80s	SCH 80	SCH 100	SCH 120	SCH 140	SCH 160
10	0.365 in (9.271 mm)	0.365 in (9.271 mm)	0.500 in (12.700 mm)	0.500 in (12.700 mm)	0.593 in (15.062 mm)	0.718 in (18.237 mm)	0.843 in (21.412 mm)	1.000 in (25.400 mm)	1.125 in (28.575 mm)
12	0.375 in (9.525 mm)	0.406 in (10.312 mm)	0.500 in (12.700 mm)	0.500 in (12.700 mm)	0.687 in (17.450 mm)	0.843 in (21.412 mm)	1.000 in (25.400 mm)	1.125 in (28.575 mm)	1.312 in (33.325 mm)
14	0.375 in (9.525 mm)	0.437 in (11.100 mm)	0.593 in (15.062 mm)	0.500 in (12.700 mm)	0.750 in (19.050 mm)	0.937 in (23.800 mm)	1.093 in (27.762 mm)	1.250 in (31.750 mm)	1.406 in (35.712 mm)
16	0.375 in (9.525 mm)	0.500 in (12.700 mm)	0.656 in (16.662 mm)	0.500 in (12.700 mm)	0.843 in (21.412 mm)	1.031 in (26.187 mm)	1.218 in (30.937 mm)	1.437 in (36.500 mm)	1.593 in (40.462 mm)
18	0.375 in (9.525 mm)	0.562 in (14.275 mm)	0.750 in (19.050 mm)	0.500 in (12.700 mm)	0.937 in (23.800 mm)	1.156 in (29.362 mm)	1.375 in (34.925 mm)	1.562 in (39.675 mm)	1.781 in (45.237 mm)
20	0.375 in (9.525 mm)	0.593 in (15.062 mm)	0.812 in (20.625 mm)	0.500 in (12.700 mm)	1.031 in (26.187 mm)	1.280 in (32.512 mm)	1.500 in (38.100 mm)	1.750 in (44.450 mm)	1.968 in (49.987 mm)
24	0.375 in (9.525 mm)	0.687 in (17.450 mm)	0.968 in (24.587 mm)	0.500 in (12.700 mm)	1.218 in (30.937 mm)	1.531 in (38.887 mm)	1.812 in (46.025 mm)	2.062 in (52.375 mm)	2.343 in (59.512 mm)

Explanation:

Schedule 40 and 80 approaching the STD and XS and are in many cases the same.

From NPS 12 and above the wall thickness between schedule 40 and STD are different, from NPS 10 and above the wall thickness between schedule 80 and XS are different.

Schedule 10, 40 and 80 are in many cases the same as schedule 10S, 40S and 80S.

But watch out, from NPS 12 – NPS 22 the wall thicknesses in some cases are different. Pipes with suffix “S” have in that range thinner wall ticknesses.

ASME B36.19 does not cover all pipe sizes. Therefore, the dimensional requirements of ASME B36.10 apply to stainless steel pipe of the sizes and schedules not covered by ASME B36.19.

The terms Nominal Bore (NB) and Nominal Diameter (DN) are also frequently used interchangeably with Nominal Pipe Size (NPS). Nominal Bore (NB) is European Designation equivalent to NPS. For NPS 5 and larger, the Nominal Diameter (DN) is equal to the NPS multiplied by 25.

Initially there are only three pipe wall thicknesses in use –

Standard (STD)
Extra Strong (XS)
Double Extra Strong (XXS)

However with the advancement of industrial age and use of pipes in varying pressure and temperature conditions, these three sizes did not fit all applications. There have been many revisions and additions to the tables of pipe sizes based on industry use and on standards from API, ASTM, and others. Today we have a range of wall thicknesses, namely:

SCH 5, 5S, 10, 10S, 20, 30, 40, 40S, 60, 80, 80S, 100, 120, 140, 160, STD, XS AND XXS.

Stainless steel pipes, due to less risk of failure due to non-corrosive property, permitted the use of pipes with thinner wall thickness. Initially thinner pipe schedules 5S and 10S had been created and afterwards other “S” sizes followed later. Stainless steel pipes are most often available in standard weight sizes (noted by the S designation; for example, Sch 10S). However stainless steel pipe can also be available in other schedules. Due to their thin walls, the smaller “S” sizes can not be threaded together according to ASME code, but must be fusion welded.

In new schedule system,

Schedule Standard (STD) is identical to SCH 40S, and 40S is identical to 40 for NPS 1/8 to NPS 10, inclusive.
Schedule Extra Strong (XS) is identical to SCH 80S, and 80S is identical to 80 for NPS 1/8 to NPS 8, inclusive.
Schedule Double Extra Strong (XXS) wall is thicker than schedule 160 from NPS 1/8 in to NPS 6 in inclusive, and schedule 160 is thicker than XXS wall for NPS 8 in and larger.

Nominal Pipe Size and Schedule collectively sets the pipe outside diameter (OD) and the wall thickness (and hence the internal diameter (ID) is automatically fixed). For example, NPS 14 Sch 40 has an OD of 14 inches (360 mm) and a wall thickness of 0.437 inches (11.1 mm).

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