Schedule 80 pipe thickness

In industrial piping systems, the wall thickness of pipes directly affects their pressure-bearing capacity and service life. Among them, Schedule 80 (SCH 80) pipes are widely used in high-pressure, high-temperature and corrosive medium transportation environments due to their relatively thick wall thickness and excellent pressure resistance performance. This article will provide you with a comprehensive analysis of the definition, dimension table, comparison with other grades, and application scenarios of the wall thickness of Schedule 80 pipes.

What is Schedule 80 pipe wall thickness?

"Schedule" is a number in the ASME standard used to indicate the relationship between the wall thickness of a pipe and its nominal diameter (NPS).
The larger the number, the thicker the wall thickness and the higher the pressure-bearing capacity.
Schedule 80 is a thick-walled pipe and is often used in high-pressure, high-temperature or harsh working conditions.

Several common grades:

Schedule 40 → Medium wall thickness, atmospheric pressure pipeline
Schedule 80 → Thick-walled, high-pressure applications
Schedule 160 → Extra-thick wall, ultra-high pressure system

Schedule 80 Wall Thickness Table of Carbon Steel & Stainless Steel Pipes (ASME B36.10 / B36.19）

NPS (inch)	OD (inch)	WT (inch)	WT (mm)
1/2"	0.840	0.147	3.73
3/4"	1.050	0.154	3.91
1"	1.315	0.179	4.55
1-1/4"	1.660	0.191	4.85
1-1/2"	1.900	0.200	5.08
2"	2.375	0.218	5.54
3"	3.500	0.300	7.62
4"	4.500	0.337	8.56
6"	6.625	0.432	10.97
8"	8.625	0.500	12.70
10"	10.750	0.593	15.06
12"	12.750	0.687	17.45

Comparison of wall thickness between Schedule 80 and Schedule 40

NPS	SCH 40 (inch)	SCH 80 (inch)
2"	0.154	0.218
4"	0.237	0.337
6"	0.280	0.432

Thickness difference: The wall thickness of Schedule 80 is significantly greater than that of Schedule 40.
Pressure resistance capacity: Under the same size, Schedule 80 can withstand higher pressure.
Inner diameter influence: An increase in wall thickness will reduce the inner diameter, affecting the flow rate.

Application field

Schedule 80 pipes, due to their thick walls and high strength, are suitable for:

Oil and gas pipeline
High-pressure water pipes for fire protection systems
Industrial water and steam pipelines
Transportation of corrosive media in chemical plants
High-temperature and high-pressure boiler system


International standard comparison table

Standard name	Approximate correspondence
ASME B36.10 / B36.19	Schedule 80
ISO	Series 40
DIN	DIN 2448

Procurement and selection suggestions

Before purchasing, the standards (ASME/ASTM) and materials (carbon steel, stainless steel, PVC) should be confirmed.
Select the appropriate wall thickness grade based on the working pressure and temperature.
It is recommended to measure the wall thickness before installation to prevent the purchase of non-standard products.


Frequently Asked Questions (FAQ）

Q1: Is the wall thickness of the pipeline in Schedule 80 fixed?
Yes, under the same standard and material, the wall thickness is fixed.

Q2: Are the wall thicknesses of PVC and steel pipes on Schedule 80 the same?
The appearance dimensions are the same, but the pressure-bearing performance is different.

Q3: Can Schedule 80 tubes be used for drinking water?
Sure, as long as the material (such as stainless steel, PVC) meets the safety standards for drinking water.

Read more：Schedule 80 vs Schedule 40 pipe  or Schedule 80 galvanized steel pipe