Schedule 80 Pipe Dimensions/ Size – PANDAPIPE

Schedule 80 pipe is a standardized heavy-wall pipe series. Compared with Schedule 40 of the same NPS, it generally has the same outside diameter but a thicker wall, smaller inside diameter and greater weight. Under comparable material and operating conditions, the thicker wall can provide greater mechanical strength and pressure-handling capability.

PANDAPIPE supplies Schedule 80 steel pipe in selected sizes, materials and manufacturing specifications. Contact us to confirm availability for your project.

What Is Schedule 80 Pipe?

Schedule 80 pipe is a standardized pipe wall-thickness series. The number “80” is a schedule designation, not a wall-thickness measurement or a percentage of the pipe diameter. Actual wall thickness varies according to nominal pipe size (NPS).

For the same NPS, Schedule 80 pipe generally has the same outside diameter as Schedule 40 but a thicker wall. As a result, it has a smaller inside diameter, greater weight and, under comparable material and operating conditions, a higher pressure-handling capability.

For example, NPS 2 Schedule 40 and Schedule 80 steel pipes both have an outside diameter of 2.375 inches (60.3 mm). However, the Schedule 40 wall thickness is 0.154 inches (3.91 mm), while the Schedule 80 wall thickness is 0.218 inches (5.54 mm).

Schedule 80 steel pipe is commonly considered for:

Process and industrial piping
Oil and gas service
Steam and high-temperature systems
Threaded piping connections
Applications requiring additional corrosion allowance
Systems exposed to greater mechanical loads

However, Schedule 80 alone does not determine whether a pipe is suitable for a particular pressure or temperature. Engineers must also consider the material grade, pipe size, design temperature, corrosion allowance, joint type and applicable piping code.

Schedule 80 Pipe Dimensions, Wall Thickness and Weight Chart

Schedule 80 Steel Pipe Dimensions Chart (NPS 1/8–24)

The following Schedule 80 steel pipe chart covers sizes from NPS 1/8 to NPS 24. It lists nominal pipe size, DN, outside diameter, nominal wall thickness, calculated inside diameter and theoretical weight per meter. Dimensions follow the ASME B36.10M dimensional series for welded and seamless wrought steel pipe.

Schedule 80 Pipe Dimensions Chart (NPS 2″–24″)

NPS (inch)	DN	OD (mm)	Wall (inch)	Wall (mm)	ID (mm)	Weight (kg/m)
1/8	6	10.3	0.095	2.41	5.48	0.47
1/4	8	13.7	0.119	3.02	7.66	0.80
3/8	10	17.1	0.126	3.20	10.70	1.10
1/2	15	21.3	0.147	3.73	13.84	1.62
3/4	20	26.7	0.154	3.91	18.88	2.20
1	25	33.4	0.179	4.55	24.30	3.24
1 1/4	32	42.2	0.191	4.85	32.50	4.47
1 1/2	40	48.3	0.200	5.08	38.14	5.41
2	50	60.3	0.218	5.54	49.22	7.48
2 1/2	65	73.0	0.276	7.01	58.98	11.41
3	80	88.9	0.300	7.62	73.66	15.27
3 1/2	90	101.6	0.318	8.08	85.44	18.64
4	100	114.3	0.337	8.56	97.18	22.32
5	125	141.3	0.375	9.53	122.24	30.97
6	150	168.3	0.432	10.97	146.36	42.56
8	200	219.1	0.500	12.70	193.70	64.64
10	250	273.0	0.594	15.09	242.82	95.98
12	300	323.8	0.688	17.48	288.84	132.05
14	350	355.6	0.750	19.05	317.50	158.11
16	400	406.4	0.844	21.44	363.52	203.54
18	450	457.0	0.938	23.83	409.34	254.57
20	500	508.0	1.031	26.19	455.62	311.19
22	550	559.0	1.125	28.58	501.84	373.85
24	600	610.0	1.219	30.96	548.08	442.11

Inside diameter is calculated as OD minus twice the nominal wall thickness. The listed weights are theoretical values based on a carbon steel density of approximately 7,850 kg/m³. Actual weight may vary because of dimensional tolerances, material density and coating.

Schedule 80 pipe becomes considerably heavier as NPS increases. In export orders, large-diameter heavy-wall pipes may reach the container payload limit before the available loading volume is fully used. Buyers should therefore calculate total pipe weight, bundle weight and container payload during quotation and shipping planning.

This dimensional chart does not provide allowable working-pressure values. Pressure capability must be evaluated using the material grade, pipe size, design temperature, corrosion allowance, joint type and applicable piping code.

What Do These Schedule 80 Dimensions Mean?

Schedule 80 pipe uses a significantly thicker wall than Schedule 40 while maintaining the same outside diameter (OD). The increased wall thickness provides higher pressure resistance and greater mechanical strength, making Schedule 80 pipe a preferred choice for high-pressure industrial systems.

For example, a 6-inch Schedule 80 pipe has an outside diameter of 168.3 mm, the same as a Schedule 40 pipe, but the wall thickness increases to 10.97 mm. This additional thickness improves pressure handling capability while also increasing pipe weight and material cost.

Schedule 80 Pressure Rating

Schedule 80 pipe has a thicker wall than Schedule 40 pipe of the same NPS. Under otherwise comparable conditions, this can provide greater pressure-handling capability. However, Schedule 80 does not have one universal pressure rating.

Allowable working pressure depends on the pipe size, material grade, design temperature, manufacturing specification, corrosion allowance, joint type and applicable piping code. The final pressure rating should therefore be calculated or verified by the project engineer rather than selected from pipe schedule alone.

When requesting Schedule 80 pipe for pressure service, buyers should provide the design pressure, design temperature, conveyed medium, material specification and applicable design code.

Schedule 40 vs Schedule 80 Pipe Thickness Comparison

Many buyers compare Schedule 80 with Schedule 40 before selecting a pipe specification. While both schedules share the same outside diameter, Schedule 80 features a thicker wall, higher pressure resistance, and greater mechanical strength. However, the increased wall thickness also results in higher weight and material costs. For a detailed comparison of dimensions, wall thickness, weight, and applications, see our Schedule 40 vs Schedule 80 Pipe Guide.

NPS	Sch 40 Thickness (mm)	Sch 80 Thickness (mm)	Increase
2″	3.91	5.54	+42%
3″	5.49	7.62	+39%
4″	6.02	8.56	+42%
6″	7.11	10.97	+54%
8″	8.18	12.70	+55%
10″	9.27	15.09	+63%
12″	10.31	17.48	+70%

The main difference between SCH 40 and SCH 80 is wall thickness. SCH 80 provides higher pressure capability but also increases welding time, steel consumption, and installation cost.

Schedule 40 vs Schedule 80 Comparison

Feature	SCH 40	SCH 80
Wall Thickness	Standard	Thicker
Weight	Lighter	Heavier
Pressure Rating	Lower	Higher
Welding Difficulty	Easier	More Difficult
Common Use	General Service	High Pressure

In many low-pressure systems, SCH 40 is already sufficient. Over-specifying SCH 80 may increase project cost without adding real engineering value.

However, SCH 80 becomes important in:

threaded industrial piping
high-pressure steam systems
refinery pipelines
corrosive processing environments
heavy mechanical applications

Seamless vs ERW Schedule 80 Pipe

Buyers should also understand manufacturing methods before placing orders.

Both seamless and ERW pipe may be supplied in Schedule 80 dimensions when permitted by the applicable material specification. Selection should be based on the project standard, size range, service conditions, inspection requirements and commercial availability—not schedule alone.

Schedule 80 Materials and Standards

ASME B36.10M standardizes dimensions for welded and seamless wrought steel pipe. Material and manufacturing requirements are specified separately by standards such as:

ASTM A53 — welded and seamless carbon steel pipe for mechanical and pressure applications
ASTM A106 — seamless carbon steel pipe for high-temperature service
API 5L — seamless and welded line pipe for pipeline transportation systems
ASTM A312 — seamless, welded and heavily cold-worked austenitic stainless steel pipe

PANDAPIPE Export and Supply Experience

Based on PANDAPIPE export records, Schedule 80 pipe is most commonly ordered for:

Industry	Common Size Range	Typical Standard
Chemical Processing	2″–8″	ASTM A106
Oil & Gas	4″–16″	API 5L
Power Generation	2″–12″	ASTM A335
Industrial Piping	2″–10″	ASTM A53

In our export projects, buyers typically choose Schedule 80 when higher pressure resistance, longer service life, and additional corrosion allowance are required. Although material costs are higher than Schedule 40, Schedule 80 often reduces maintenance and replacement costs in demanding operating conditions.

Schedule 80 Steel Pipe Advantages

Thicker-Wall Design

Schedule 80 wall thickness varies by NPS. Compared with Schedule 40 of the same nominal size, its thicker wall increases pipe weight and reduces inside diameter. Under comparable material and design conditions, the additional wall thickness can improve mechanical strength and pressure-handling capability.

However, suitability for high-pressure or high-temperature service must still be verified against the material specification and applicable piping code.

Corrosion Allowance and Material Selection

Schedule 80 does not automatically make a pipe corrosion-resistant. Its thicker wall may provide additional corrosion allowance, but actual corrosion performance depends on the pipe material, coating or lining, conveyed medium, temperature and operating environment.

For corrosive service, buyers may consider suitable stainless steel, duplex stainless steel, corrosion-resistant alloy, internal lining or protective coating according to the project specification.

Pressure and Temperature Considerations

The pressure and temperature limits of Schedule 80 pipe depend on more than wall thickness. Material grade, NPS, manufacturing specification, allowable stress, corrosion allowance and the applicable design code must all be considered.

For high-temperature or severe-pressure service, the purchaser should verify the selected material specification and obtain design approval before ordering. Schedule 80 dimensions alone do not confirm suitability for a particular operating condition.

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January 22, 2025

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