Overview of Schedule 80 Carbon Steel Pipe
In industrial and construction projects, selecting the right type of steel pipe directly affects safety, durability, and cost efficiency. Schedule 80 Carbon Steel Pipe stands out due to its thicker wall and enhanced pressure-handling capacity, making it ideal for high-stress environments. This comprehensive guide explains what Schedule 80 pipe is, its technical specifications, typical applications, and how to choose the right size and grade for your needs.
Schedule 80 Carbon Steel Pipe Meaning
The term “
Schedule” (abbreviated as SCH) refers to a standardized pipe wall thickness as defined by the American Society of Mechanical Engineers (ASME). The higher the schedule number, the thicker the pipe wall. Common designations include SCH 10, SCH 40, SCH 80, and SCH 160. Schedule 80 represents a medium-to-thick wall pipe, designed to withstand higher pressures compared to Schedule 40.
Schedule classifications are paired with Nominal Pipe Size (NPS). For example, a 1" NPS Schedule 80 pipe refers to a nominal 1-inch pipe with wall thickness according to the Schedule 80 standard.
Schedule 80 Carbon Steel Pipe Specifications and Dimensions
Schedule 80 pipes are defined by standards such as ASME B36.10, ASTM A53, and ASTM A106. Below are some commonly used Schedule 80 dimensions (in millimeters):
|
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
|
Application of Schedule 80 Carbon Steel Pipe
Schedule 80
carbon steel pipe has a wide range of applications in many fields due to its excellent durability and strength:
Oil and gas pipelines
High-pressure steam lines
Power plants and refineries
Chemical processing systems
Structural and mechanical support
Underground fire protection systems
In these systems, the pipe must withstand not just pressure but also external physical and environmental stresses.
Understanding Pipe Size Notations: SCH, DN, and NB
Pipe sizing conventions can vary depending on the region and standard:
|
Notation
|
Description
|
Common Usage Region
|
|
SCH
|
Wall thickness schedule (e.g., 40, 80)
|
USA, Southeast Asia
|
|
DN
|
Nominal diameter in millimeters
|
Europe, China
|
|
NB
|
Nominal Bore, an imperial measure
|
UK, India
|
For example, DN 50 ≈ NPS 2" ≈ NB 2".
Comparison with Other Schedule Grades
Schedule 80 is just one option among several wall thickness grades. Below is a comparison of common grades:
|
Grade
|
Abbreviation
|
Wall Thickness
|
Typical Use Cases
|
|
Standard
|
STD
|
Standard wall
|
General plumbing and low pressure
|
|
Extra Strong
|
XS
|
Thicker wall
|
Medium-pressure industrial systems
|
|
Double XS
|
XXS
|
Very thick wall
|
High-pressure and critical systems
|
Where to Buy Schedule 80 Carbon Steel Pipe
When sourcing Schedule 80 carbon steel pipes, choose a supplier that offers:
Third-party test reports (TPTR)
Mill test certificates (MTC)
Compliance with ASTM or API standards
Cutting, threading, and custom fabrication services
Prompt delivery and after-sales support
Reliable suppliers also provide guidance on coating, storage, and installation practices.
Baowi Steel offers premium Schedule 80 carbon steel pipes with reliable quality and fast delivery. All products meet ASTM, ASME, and API standards.
Get competitive pricing, custom sizes, and expert support from a trusted steel supplier. Contact Baowi Steel today for a free quote.
Frequently Asked Questions (FAQ)
Q1: What is the pressure rating of Schedule 80 carbon steel pipe?
A1: The pressure rating depends on the pipe size and material. For example, a 2-inch Schedule 80 pipe made of ASTM A106 Grade B carbon steel can handle over 1,000 psi at room temperature.
Q2: Can Schedule 80 carbon steel pipe be used underground?
A2: Yes, but proper coating or wrapping is required to protect against corrosion.
Q3: What standards apply to Schedule 80 carbon steel pipes?
A3: Common standards include ASTM A53, ASTM A106, API 5L, and ASME B36.10M.
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