A Schedule 80 pipe weight chart helps engineers and buyers quickly identify the weight of steel pipes based on nominal size, outside diameter, wall thickness, and length. According to ASME B36.10M standards, Schedule 80 steel pipes are manufactured with heavier walls than Schedule 40 pipes, making them suitable for applications where higher pressure ratings and stronger mechanical performance are required.
This article explains Schedule 80 pipe weights in detail, including standard weight tables, calculation formulas, influencing factors, and common industrial uses. By understanding these values, engineers can make more accurate decisions for piping design, cost estimation, and material planning.
1. Basic Overview of Schedule 80 Pipe
Schedule numbers define the wall thickness of steel pipes, which affects pipe weight, pressure capacity, and service performance. Schedule 80 pipe (SCH80) is a heavy-wall pipe commonly used in high-pressure systems, industrial fluid transportation, and structural applications.
SCH80 pipes have the same outside diameter as other schedules under the same NPS size, but with thicker walls. This design increases strength, weight, and pressure resistance while reducing internal flow space.
Compared with SCH40 pipes, SCH80 pipes are heavier and provide better performance in demanding environments, making them suitable for high-pressure, high-temperature, and heavy-duty applications.
2. Key Parameter Definitions in SCH80 Weight Chart
To accurately use the Schedule 80 pipe weight chart, it is necessary to clarify the core parameter indicators, all of which comply with international industrial standards:
NPS (Nominal Pipe Size): Nominal pipe diameter (inches), the unified nominal specification for pipe classification, not the actual inner or outer diameter.
Outer Diameter (OD): Actual outer diameter of the pipe (inch/mm), fixed for the same NPS, unchanged with schedule grades.
Wall Thickness (WT): Pipe wall thickness (inch/mm), the core parameter distinguishing SCH80 from other schedules, directly affecting pipe weight and pressure resistance.
Inner Diameter (ID): Actual inner diameter of the pipe, calculated by outer diameter minus twice the wall thickness, determining fluid flow capacity.
Unit Weight: Pipe weight per unit length, expressed in lb/ft (pound per foot) and kg/m (kilogram per meter), the core data of the weight chart .
3. Complete Schedule 80 Pipe Weight & Dimension Chart
The following table covers full-size SCH80 carbon steel pipe parameters from NPS 1/8” to NPS 12”, integrating inch and metric units, including outer diameter, wall thickness, inner diameter, and standard unit weight, which is applicable to global industrial engineering design and material statistics .
|
NPS (Nominal Size)
|
Outer Diameter (in / mm)
|
Wall Thickness (in / mm)
|
Inner Diameter (in / mm)
|
Weight (lb/ft)
|
Weight (kg/m)
|
|
1/8"
|
0.405 / 10.3
|
0.068 / 1.73
|
0.269 / 6.83
|
0.245
|
0.364
|
|
1/4"
|
0.540 / 13.7
|
0.088 / 2.24
|
0.364 / 9.24
|
0.423
|
0.629
|
|
3/8"
|
0.675 / 17.1
|
0.091 / 2.31
|
0.493 / 12.52
|
0.568
|
0.845
|
|
1/2"
|
0.840 / 21.3
|
0.109 / 2.77
|
0.622 / 15.80
|
0.851
|
1.268
|
|
3/4"
|
1.050 / 26.9
|
0.113 / 2.87
|
0.824 / 20.93
|
1.13
|
1.685
|
|
1"
|
1.315 / 33.4
|
0.133 / 3.38
|
1.049 / 26.64
|
1.67
|
2.495
|
|
1-1/4"
|
1.660 / 42.2
|
0.191 / 4.85
|
1.278 / 32.46
|
2.72
|
4.06
|
|
1-1/2"
|
1.900 / 48.3
|
0.200 / 5.08
|
1.500 / 38.10
|
3.16
|
4.7
|
|
2"
|
2.375 / 60.3
|
0.218 / 5.54
|
1.939 / 49.25
|
4.22
|
7.48
|
|
3"
|
3.500 / 88.9
|
0.300 / 7.62
|
2.900 / 73.66
|
9.03
|
15.27
|
|
4"
|
4.500 / 114.3
|
0.337 / 8.56
|
3.826 / 97.18
|
14.98
|
22.3
|
|
5"
|
5.563 / 141.3
|
0.375 / 9.53
|
4.813 / 122.25
|
20.78
|
30.97
|
|
6"
|
6.625 / 168.3
|
0.432 / 10.97
|
5.761 / 146.33
|
28.6
|
42.56
|
|
8"
|
8.625 / 219.1
|
0.500 / 12.70
|
7.625 / 193.68
|
43.43
|
64.7
|
|
10"
|
10.750 / 273.0
|
0.593 / 15.06
|
9.564 / 242.93
|
64.28
|
95.8
|
|
12"
|
12.750 / 323.9
|
0.687 / 17.45
|
11.376 / 288.95
|
88.71
|
132.2
|
Note: All data complies with ASME B36.10M standard; slight deviations exist for seamless and welded pipes, and the table adopts standard theoretical weight.
4. SCH80 Pipe Weight Calculation Formula
For non-standard or special-length SCH80 pipes, theoretical weight can be calculated manually. The universal calculation formula for carbon steel pipe weight is as follows:
Weight per meter (kg/m) = (Outer Diameter mm - Wall Thickness mm) × Wall Thickness mm × 0.02466
Weight per foot (lb/ft) = Weight per meter × 0.672
This formula is applicable to all SCH80 carbon steel pipes. The constant 0.02466 is derived from the density of carbon steel (7.85g/cm³), which can accurately calculate the theoretical weight of pipes and is widely used for engineering budget and material counting .
Schedule 40 and Schedule 80 are two of the most commonly used carbon steel pipe schedules.
They share the same nominal pipe size and outside diameter, but their wall thickness and weight are different.
The main reason engineers choose SCH 80 pipe is its increased wall thickness.
|
Item
|
SCH 40 Pipe
|
SCH 80 Pipe
|
|
Wall Thickness
|
Standard wall
|
Thicker wall
|
|
Outside Diameter
|
Same NPS OD
|
Same NPS OD
|
|
Inside Diameter
|
Larger
|
Smaller
|
|
Pipe Weight
|
Lower
|
Higher
|
|
Pressure Capability
|
Normal pressure service
|
Higher pressure service
|
|
Material Cost
|
Lower
|
Higher
|
|
Flow Capacity
|
Higher
|
Slightly reduced
|
|
Support Requirement
|
Lower load
|
Higher load
|
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