Pipe Schedule Chart: Steel Pipe Dimensions and Wall Thickness

Pipe schedule is an important specification used to describe the wall thickness of steel pipes. For the same nominal pipe size, the outside diameter usually remains the same, while the wall thickness changes according to the schedule number, such as SCH 40, SCH 80 or SCH 160.

This pipe schedule chart helps engineers, buyers and project teams compare steel pipe outside diameter, wall thickness and common schedule dimensions for industrial pipeline projects.

Pipe Schedule Chart
Normal Diameter		OD(MM)	WALL THICKMESS(MM)
			ANSI B36.10M						ANSI B36.19M
A(MM)	B(INCH)	ASME	SCH5/5S	SCH10S	SCH10	SCH20	SCH30	STD	SCH40	SCH40S	SCH60	XS	SCH80	SCH80S	SCH100	SCH120	SCH140	SCH160	XXS
6	1/8"	10.29		1.24	1.24		1.45	1.73	1.73	1.73		2.41	2.41	2.41
8	1/4"	13.72		1.65	1.65		1.85	2.24	2.24	2.24		3.02	3.02	3.02
10	3/8"	17.14		1.65	1.65		1.85	2.31	2.31	2.31		3.2	3.2	3.2
15	1/2"	21.34	1.65	2.11	2.11		2.41	2.77	2.77	2.77		3.73	3.73	3.73				4.78	7.47
20	3/4"	26.67	1.65	2.11	2.11		2.41	2.87	2.87	2.87		3.91	3.91	3.91				5.56	7.82
25	1"	33.40	1.65	2.77	2.77		2.9	3.38	3.38	3.38		4.55	4.55	4.55				6.35	9.09
32	1.1/4"	42.16	1.65	2.77	2.77		2.97	3.56	3.56	3.56		4.85	4.85	4.85				6.35	9.7
40	1.1/2"	48.26	1.65	2.77	2.77		3.18	3.68	3.68	3.68		5.08	5.08	5.08				7.14	10.15
50	2"	60.32	1.65	2.77	2.77		3.18	3.91	3.91	3.91		5.54	5.54	5.54				8.74	11.07
65	2.1/2"	73.02	2.11	3.05	3.05		4.78	5.16	5.16	5.16		7.01	7.01	7.01				9.53	14.02
80	3"	88.90	2.11	3.05	3.05		4.78	5.49	5.49	5.49		7.62	7.62	7.62				11.13	15.25
90	3.1/2"	101.60	2.11	3.05	3.05		4.78	5.74	5.74	5.74		8.08	8.08	8.08
100	4"	114.30	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
125	5"	141.30	2.77	3.40	3.40			6.55	6.55	6.55		9.53	9.53	9.53		12.7		15.88	19.05
150	6"	168.28	2.77	3.40	3.40			7.11	7.11	7.11		10.97	10.97	10.97		14.27		18.26	21.95
200	8"	219.08	2.77	3.76	3.76	6.35	7.04	8.18	8.18	8.18	10.31	12.7	12.7	12.7	15.09	18.26	20.62	23.01	22.23
250	10"	273.05	3.40	4.19	4.19	6.35	7.8	9.27	9.27	9.27	12.7	12.7	15.09	12.7	18.26	21.44	25.4	28.58	25.4
300	12"	323.85	3.96	4.57	4.57	6.35	8.38	9.53	10.31	9.53	14.27	12.7	17.48	12.7	21.44	25.4	28.58	33.32	25.4
350	14"	355.60	3.96	4.78	6.35	7.92	9.53	9.53	11.13	9.53	15.09	12.7	19.05	12.7	23.83	27.79	31.75	35.71
400	16"	406.40	4.19	4.78	6.35	7.92	9.53	9.53	12.7	9.53	16.66	12.7	21.44	12.7	26.19	30.96	36.53	40.49
450	18"	457.20	4.19	4.78	6.35	7.92	11.13	9.53	14.27	9.53	19.05	12.7	23.83	12.7	29.36	34.93	39.67	45.24
500	20"	508.00	4.78	5.54	6.35	9.53	12.7	9.53	15.09	9.53	20.62	12.7	26.19	12.7	32.54	38.1	44.45	50.01
550	22"	558.80	4.78	5.54	6.35	9.53	12.7	9.53			22.23	12.7	28.58		34.93	41.28	47.63	53.98
600	24"	609.60	5.54	6.35	6.35	9.53	14.27	9.53	17.48	9.53	24.61	12.7	30.96	12.7	38.89	46.02	52.37	59.54
650	26"	660.40			7.92	12.7		9.53				12.7
700	28"	711.20			7.92	12.7	15.88	9.53				12.7
750	30"	762.00	6.35		7.92	12.7	15.88	9.53				12.7
800	32"	812.00			7.92	12.7	15.88	9.53	17.48			12.7
850	34"	863.60			7.92	12.7	15.88	9.53	17.48			12.7
900	36"	914.40			7.92	12.7	15.88	9.53	19.05			12.7
950	38"	965.20						9.53				12.7
1000	40"	1016.00						9.53				12.7
1050	42"	1066.80						9.53				12.7
1100	44"	1117.60						9.53				12.7
1150	46"	1168.40						9.53				12.7
1200	48"	1229.20						9.53				12.7
1300	52"	1320.80						9.53				12.7
1350	54"	1371.60						9.53				12.7
1400	56"	1422.40						9.53				12.7
1500	60"	1524.00						9.53				12.7
1600	64"	1625.00						9.53				12.7
1700	68"	1727.20						9.53				12.7
1800	72"	1828.80						9.53				12.7
1900	76"	1930.40						9.53				12.7
2000	80"	2032.00						9.53				12.7

What Is Pipe Schedule?

Pipe schedule, often shown as SCH, is a standardized way to indicate pipe wall thickness. A higher schedule number usually means a thicker wall and higher pressure capacity. For example, SCH 80 pipe has a thicker wall than SCH 40 pipe for the same nominal pipe size.

Pipe schedule is widely used when selectingseamless steel pipefor pressure piping, boiler systems, oil and gas pipelines and industrial applications.

Pipe Schedule Chart

The pipe schedule chart usually includes nominal pipe size, outside diameter, wall thickness and different schedule values such as SCH 10, SCH 40, SCH 80, SCH 160, STD, XS and XXS. These values help users choose the correct pipe size for design, purchase and installation.

For water, gas and structural applications,ERW steel pipeis often selected according to the required outside diameter, wall thickness and pipe schedule.

Common Pipe Schedules

SCH 40 Pipe:
SCH 40 is one of the most commonly used pipe schedules. It is widely used for general fluid transmission, water pipelines, structural applications and low to medium pressure systems.

SCH 80 Pipe:
SCH 80 pipe has a thicker wall than SCH 40 pipe and is often used where higher pressure resistance is required.

SCH 160 Pipe:
SCH 160 pipe is used for high pressure service and demanding industrial applications.

STD, XS and XXS:
STD, XS and XXS are traditional wall thickness designations. They are still commonly used in steel pipe specifications and project documents.

How to Choose the Right Pipe Schedule

The right pipe schedule depends on pressure, temperature, fluid medium, pipe material, project standard and application environment. Engineers usually select the pipe schedule according to design codes, working pressure and safety requirements.

In oil and gas transmission projects, API 5L line pipe specifications usually define the required pipe size, grade and wall thickness for pipeline service.

Related Reading

• Steel Pipe Wall Thickness Chart: SCH, mm, Inch and Gauge Explained

Convert between Schedule, millimeter, inch and legacy gauge notation, and confirm the exact wall thickness before ordering.

• Steel Pipe Size Chart: NPS, DN, OD and OD-to-Inch Conversion Table

Compare nominal pipe size, DN and actual outside diameter before selecting a Schedule.

• Steel Pipe Weight Chart and Formula

Calculate theoretical pipe weight from outside diameter and wall thickness for quotation and shipping estimates.

• Steel Pipe Tolerance Guide: OD, WT, Ovality and Dimensional Inspection

Check how permitted OD and wall-thickness variation can affect acceptance, fit-up and inspection.

• Steel Pipe Length Guide for Global Buyers

Confirm random, fixed and mill lengths together with dimensional and shipment requirements.

References and Sources

The Schedule and dimensional relationships used in this chart are based on recognized pipe standards. The licensed standard edition and the governing project design code should take precedence over a general online chart.

• ASME B36.10M - Welded and Seamless Wrought Steel Pipe

Primary dimensional reference for NPS, outside diameter and wall-thickness Schedule series for welded and seamless wrought steel pipe.

• ASME B36.19M - Stainless Steel Pipe

Dimensional reference for wrought stainless steel pipe, including Schedule designations that use the “S” suffix.

• ASME B31.3 - Process Piping

Design-code context for selecting and applying piping materials, components and wall thickness in process piping systems.

• API Specification 5L - Line Pipe

Line-pipe specification context for dimensions, manufacturing, inspection, testing, marking and ordering requirements.