Sch 80 Pipe Dimensions Chart

Schedule 80 Pipe Dimensions Chart: Sizes, Thickness, Weight

Schedule 80 pipe is a heavy-wall steel pipe designed for applications requiring higher pressure resistance, improved mechanical strength, and greater durability than standard Schedule 40 pipe. The Schedule 80 pipe dimensions, including outside diameter (OD), wall thickness, inside diameter (ID), and weight, are standardized according to ASME B36.10M for carbon and alloy steel pipes and ASME B36.19M for stainless steel pipes.

Unlike regular pipe size classifications, Schedule numbers such as SCH 40, SCH 80, and SCH 160 do not directly indicate a specific wall thickness. Instead, they define standardized wall thickness series for each Nominal Pipe Size (NPS). For the same NPS, a Schedule 80 pipe has the same outside diameter as Schedule 40 but a thicker wall and smaller inside diameter, providing higher pressure capability while slightly reducing flow capacity.

Due to its balance of strength, durability, and pressure performance, Schedule 80 steel pipe is widely used in oil and gas, chemical processing, power generation, hydraulic systems, and other industrial piping applications where reliable performance is required.

What Is Schedule 80 Pipe?

Schedule 80 pipe is a pipe thickness classification commonly used for carbon steel and alloy steel pipes.
The term "Schedule 80" indicates that the pipe has a specific wall thickness based on its nominal pipe size. The actual wall thickness changes depending on the pipe diameter.

Pipe Size	Schedule 40 Wall Thickness	Schedule 80 Wall Thickness
2 inch	3.91 mm	5.54 mm
4 inch	6.02 mm	8.56 mm
6 inch	7.11 mm	10.97 mm

Schedule 80 Pipe Standards

Schedule 80 pipe dimensions are standardized internationally to ensure interchangeability, consistent quality, and reliable engineering calculations.
The applicable standards depend on the pipe material.

Standard	Scope
ASME B36.10M	Carbon Steel & Alloy Steel Pipe Dimensions
ASME B36.19M	Stainless Steel Pipe Dimensions
ASTM A53	Welded & Seamless Carbon Steel Pipe
ASTM A106	Seamless Carbon Steel Pipe for High Temperature Service
API 5L	Line Pipe for Oil & Gas Transportation
ASTM A333	Low-Temperature Carbon Steel Pipe
ASTM A335	Alloy Steel Pipe for High Temperature Applications
ASTM A312	Stainless Steel Seamless & Welded Pipe

How Schedule 80 Pipe Dimensions Are Defined

When selecting Schedule 80 steel pipe, engineers normally consider five key dimensions:
1. Outside Diameter (OD)
The outside diameter is fixed by the nominal pipe size.
For example:
A 4 inch Schedule 80 pipe has:
OD: 4.500 inches
OD: 114.3 mm
The OD remains the same whether the pipe is Schedule 40, Schedule 80, or Schedule 160.

2. Wall Thickness
Wall thickness is the main difference between different schedules.
A thicker wall means:
Higher pressure resistance
Greater weight
Higher material cost
Smaller internal flow area

Example:
A 4 inch Schedule 80 pipe:
Wall thickness: 8.56 mm
A 4 inch Schedule 40 pipe:
Wall thickness: 6.02 mm

3. Inside Diameter (ID)
Inside diameter determines fluid flow capacity.
Because Schedule 80 pipe has a thicker wall, its ID is smaller than Schedule 40 pipe with the same NPS size.

Pipe Size	OD	Wall Thickness	Approx. ID
2 inch Sch 80	60.3 mm	5.54 mm	49.2 mm
4 inch Sch 80	114.3 mm	8.56 mm	97.2 mm
6 inch Sch 80	168.3 mm	10.97 mm	146.4 mm

Schedule 80 Pipe Dimensions Chart

The following chart shows common Schedule 80 steel pipe dimensions based on ASME B36.10M.

Nominal size [inches]	Outside diameter [inches]	Outside diameter [mm]	Wall thickness [inches]	Wall thickness [mm]	Weight [lb/ft]	Weight [kg/m]
1/8	0.405	10.3	0.095	2.41	0.31	0.47
1/4	0.54	13.7	0.119	3.02	0.54	0.8
1/2	0.84	21.3	0.147	3.73	1.09	1.62
3/4	1.05	26.7	0.154	3.91	1.47	2.2
1	1.315	33.4	0.179	4.55	2.17	3.24
1 1/4	1.66	42.2	0.191	4.85	3	4.47
1 1/2	1.9	48.3	0.2	5.08	3.63	5.41
2	2.375	60.3	0.218	5.54	5.02	7.48
2 1/2	2.875	73	0.276	7.01	7.66	11.41
3	3.5	88.9	0.3	7.62	10.25	15.27
3 1/2	4	101.6	0.318	8.08	12.5	18.63
4	4.5	114.3	0.337	8.56	14.98	22.32
5	5.563	141.3	0.375	9.53	20.78	30.97
6	6.625	168.3	0.432	10.97	28.57	42.56
8	8.625	219.1	0.5	12.7	43.39	64.64
10	10.75	273	0.594	15.09	64.43	96.01
12	12.75	323.8	0.688	17.48	88.63	132.08
14	14	355.6	0.75	19.05	106.13	158.1
16	16	406.4	0.844	21.44	136.61	203.53
18	18	457	0.938	23.83	170.92	254.55
20	20	508	1.031	26.19	208.87	311.17
24	24	610	1.125	30.96	296.58	442.08

Schedule 80 Pipe Weight & Weight Calculation

The weight of Schedule 80 pipe is an important factor in engineering design, transportation planning, installation, and cost estimation. Because SCH 80 pipe has a thicker wall than lighter schedules such as SCH 40, it contains more steel material and therefore has a higher weight per unit length.
The actual weight of a Schedule 80 pipe depends on several factors:
Nominal Pipe Size (NPS)
Outside Diameter (OD)
Wall Thickness
Pipe Material Density
Pipe Length
For the same pipe size, SCH 80 pipe is heavier than SCH 40 because of its increased wall thickness.
For example:

Pipe Size	SCH 40 Weight	SCH 80 Weight
2 inch pipe	Lower	Higher
4 inch pipe	Lower	Higher
6 inch pipe	Lower	Higher

How to Calculate Schedule 80 Pipe Weight?

The theoretical weight of carbon steel pipe can be calculated using the following formula:
Weight (kg/m) = (OD - WT) × WT × 0.02466
Where:
OD = Outside Diameter (mm)
WT = Wall Thickness (mm)
0.02466 = Constant for carbon steel density

Example:
For a 2 inch Schedule 80 carbon steel pipe:
OD = 60.3 mm
Wall thickness = 5.54 mm
Weight calculation:
(60.3 - 5.54) × 5.54 × 0.02466
≈ 7.48 kg/m
This calculated value matches the standard ASME B36.10M dimensional data.
For stainless steel and alloy steel pipes, the actual weight may vary slightly because of different material densities.

FAQ

1. What is Schedule 80 pipe?
Schedule 80 pipe is a heavy-wall pipe classification with thicker walls than Schedule 40 pipe, providing higher pressure resistance and mechanical strength.

2. Is Schedule 80 pipe stronger than Schedule 40?
Yes. Schedule 80 pipe has a thicker wall, higher weight, and generally higher pressure capability than Schedule 40 pipe of the same size.

3. What is the wall thickness of Schedule 80 pipe?
The wall thickness depends on pipe size.
For example:
2 inch Schedule 80 pipe: 5.54 mm
4 inch Schedule 80 pipe: 8.56 mm

4. What sizes are available for Schedule 80 pipe?
Schedule 80 pipes are available from small sizes such as 1/8 inch to large industrial sizes above 24 inches.

5. What is the difference between Sch 80 and Sch 160 pipe?
Schedule 160 pipe has an even thicker wall than Schedule 80 and is used for more extreme pressure applications.

6. Can Schedule 80 pipe be used for high-temperature applications?
Yes, especially when manufactured from suitable materials such as ASTM A106 Grade B.

7. Is Schedule 80 pipe suitable for oil and gas applications?
Yes. API 5L and ASTM-grade Schedule 80 pipes are commonly used in demanding oil and gas applications.