This reference provides the dimensional and weight data needed to identify Schedule 80 Pipe 5 Inch (DN125) during piping design, fabrication, procurement, and drafting. Use the table below as the local dimensional reference, then compare the result with connected components, support details, and project specifications.
For related design work, readers may also need references covering pipe schedules, flange dimensions, pipe fittings, and pipe support layout. These topics help connect the pipe’s basic dimensions with the wider piping assembly rather than treating the pipe as an isolated component.
Schedule 80 Pipe 5 Inch (DN125) is a heavy wall steel pipe commonly used in industrial piping systems that require higher strength and thicker pipe walls than lighter schedules. This pipe size is based on ANSI/ASME B36.10 and is widely used in process piping, utility systems, water treatment plants, and mechanical services. For this size, the standard data shows an outside diameter of 141.3 mm, an inside diameter of 122.24 mm, a wall thickness of 9.53 mm, and a pipe weight of 30.97 kg/m.
Schedule 80 Pipe 5 Inch (DN125) Dimensions
- Pipe Standard: ANSI/ASME B36.10
- Nominal Pipe Size: 5 inch
- DN Size: DN125
- Outside Diameter (OD): 141.3 mm
- Inside Diameter (ID): 122.24 mm
- Wall Thickness: 9.53 mm
- Pipe Weight: 30.97 kg/m
- Pipe Weight Including Water: 42.69 kg/m
What Is Schedule 80 Pipe?
Schedule 80 refers to a pipe wall thickness classification. For the same nominal pipe size, a Schedule 80 pipe has a thicker wall and a smaller inside diameter than lower schedule pipes. This makes it a practical choice for systems that need additional pipe strength, durability, and long-term service performance.
Why 5 Inch DN125 Pipe Dimensions Matter
Knowing the exact dimensions of a 5 inch Schedule 80 pipe is important for piping design, fabrication, and installation. The outside diameter helps with flange matching, clamps, and supports. The inside diameter affects flow area and system capacity. The wall thickness is important for strength and service conditions, while the pipe weight per meter is useful for transport, lifting plans, and structural support calculations.
Common Uses of Schedule 80 Pipe 5 Inch (DN125)
This pipe size is often used in industrial and commercial piping systems such as:
- Water treatment and utility piping
- Process and plant piping systems
- Oil and gas applications
- Pump stations and mechanical services
- Heavy-duty industrial pipe networks
5 Inch Schedule 80 Pipe Data Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 5 inch | 125 | 141.3 | 122.24 | 9.53 | 30.97 |
Additional Information for Engineers and Buyers
Before selecting this pipe size, it is also important to review the material grade, end type, design pressure, corrosion allowance, operating temperature, and project code requirements. While Schedule 80 defines the dimensional wall category, the final pipe selection should always match the actual service condition and engineering specification.
Note: NPS means nominal pipe size in inches, while DN means diameter nominal in millimeters. These are standard reference sizes used for pipe identification.
How to Use This 5 Inch Schedule 80 Pipe Data
The listed outside diameter is the primary interface dimension for components that fit around the pipe, including flanges, clamps, supports, and fabrication tools. The inside diameter describes the available internal passage and is therefore relevant to flow-area checks, valve selection, and connection details. The wall thickness sits between these two dimensions and should be reviewed when checking fabrication requirements, corrosion allowance, and the applicable design rules.
Schedule 80 is a dimensional wall classification, not a complete statement of allowable operating pressure. Material grade, manufacturing specification, temperature, corrosion conditions, joints, fittings, and the governing design code can all affect the final engineering assessment. The schedule designation should therefore be used together with the project piping specification and service conditions.
Weight and Installation Planning
The listed pipe weight supports preliminary handling, transport, lifting, and support-layout discussions. The separate weight including water is useful when considering an operating or filled condition, but the complete support design may also need to account for insulation, valves, fittings, fluid properties, and other attached items. Those additions should be evaluated separately rather than assumed to be included in the pipe-only data.
Using the DWG Reference
The downloadable DWG can support drafting and layout workflows where a dimensional representation of the pipe is needed. Before incorporating it into a fabrication or construction drawing, verify units, insertion scale, connection details, material requirements, and project-specific tolerances. Related internal references for CAD pipe blocks, flange connection dimensions, and pipe fitting terminology can help complete the surrounding design documentation.
Frequently Asked Questions
What does Schedule 80 mean for 5 inch pipe?
Schedule 80 identifies the pipe wall-thickness classification for this nominal pipe size. Compared with a lighter schedule of the same nominal size, it generally has a thicker wall and a smaller internal passage. The dimensional values in the table are the controlling reference for this page.
Is DN125 the same as an exact measured diameter?
No. DN125 is a nominal identification used for pipe sizing. It should not be treated as the pipe’s measured outside or inside diameter. Use the listed OD and ID when coordinating fittings, supports, clearances, and flow-related checks.
Does Schedule 80 alone determine pressure capability?
No. Pressure capability depends on more than the schedule designation. The material, temperature, manufacturing requirements, corrosion allowance, joining method, and governing design code must also be reviewed by the responsible engineer.
What is the pipe weight including water used for?
It provides a reference for a filled-pipe condition and can assist with preliminary support, handling, and load discussions. The final design should also consider the mass of fittings, valves, insulation, supports, and the actual contained fluid where applicable.
Can the DWG file be used directly for fabrication?
The DWG is a drafting reference and should be checked against the project drawing standard and engineering specification before fabrication. Confirm units, scale, connection requirements, tolerances, and any details that are not represented in the reference file.