Use this reference when you need to identify, model, estimate, or coordinate 3 inch Schedule 40 pipe in a piping project. The page separates nominal pipe identification from the measured outside diameter, inside diameter, wall thickness, and unit weight shown in the technical data below.
For related design work, compare this reference with the site’s pipe schedule references, pipe fitting dimensions, and flange references. These cross-references help maintain consistent connection, routing, and material-takeoff information across a piping model or drawing set.
Schedule 40 pipe 3 inch (DN80) is a standard steel pipe size commonly used in piping design, fabrication, drafting, and engineering estimation work. This page provides the standard dimensions and weight data for NPS 3 Schedule 40 pipe based on ANSI / ASME B36.10, including outside diameter, inside diameter, wall thickness, and weight per meter.
This size is widely used in industrial piping systems, utility services, water lines, and fabrication projects where accurate dimensional data is important for layout, support design, material takeoff, and installation planning.
3 Inch Schedule 40 Pipe Dimensions
- Nominal Pipe Size (NPS): 3 inch
- Diameter Nominal (DN): DN80
- Pipe Schedule: Schedule 40
- Outside Diameter (OD): 88.9 mm
- Wall Thickness: 5.49 mm
- Inside Diameter (ID): 77.92 mm
- Pipe Weight: 11.29 kg/m
- Pipe Weight Including Water: 16.05 kg/m
- Reference Standard: ANSI / ASME B36.10
Schedule 40 Pipe 3 Inch (DN80) Data Table
| NPS | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 3 inch | DN80 | 88.9 | 5.49 | 77.92 | 11.29 |
What Is 3 Inch Schedule 40 Pipe Used For?
3 inch Schedule 40 pipe is commonly used in industrial and utility piping systems where a standardized steel pipe size is required. Engineers, designers, and fabricators often use this size in:
- Water distribution systems
- Cooling water piping
- Industrial utility lines
- Process piping systems
- Mechanical piping layouts
- Fabrication and spool drawing preparation
Because this is a practical and widely used pipe size, accurate dimensions and weight data are important for support design, installation work, material estimation, and field coordination.
Why These Dimensions Matter in Engineering
In piping and mechanical design, standard pipe dimensions are important for more than simple identification. The outside diameter is used for supports, clamps, insulation sizing, and equipment connection layouts. The inside diameter affects internal flow area and hydraulic calculations. The wall thickness is important for fabrication, welding preparation, and pipe strength, while the pipe weight per meter is essential for support load calculations and installation planning.
Using the correct DN80 Schedule 40 pipe dimensions helps reduce drafting errors, procurement mistakes, and field fit-up problems during construction and fabrication work.
3 Inch DN80 Schedule 40 Pipe for CAD and Drafting Work
For CAD, BIM, and piping drafting work, this size is commonly listed as NPS 3 or DN80. The standard OD of 88.9 mm is especially useful for routing clearance, support detailing, and nozzle or equipment connection references in both 2D drawings and 3D models.
This page can be used as a quick reference for 3 inch Schedule 40 pipe dimensions, DN80 pipe dimensions, and Schedule 40 steel pipe weight per meter during design, drafting, and estimation work.
Frequently Asked Questions
What is the outside diameter of 3 inch Schedule 40 pipe?
The outside diameter of 3 inch Schedule 40 pipe is 88.9 mm.
What is the wall thickness of DN80 Schedule 40 pipe?
The wall thickness is 5.49 mm.
What is the inside diameter of Schedule 40 pipe 3 inch?
The inside diameter is 77.92 mm.
How much does 3 inch Schedule 40 pipe weigh?
The pipe weight is 11.29 kg/m. The weight including water is 16.05 kg/m.
Which standard covers these dimensions?
These dimensions are based on ANSI / ASME B36.10.
Conclusion
Schedule 40 pipe 3 inch (DN80) is an important reference size for industrial piping, drafting, fabrication, and engineering calculations. With an OD of 88.9 mm, ID of 77.92 mm, wall thickness of 5.49 mm, and weight of 11.29 kg/m, it is a useful standard pipe size for engineers, designers, and estimators working with steel piping systems.
For more pipe schedule data, compare this size with nearby standard sizes such as 2-1/2 inch and 3-1/2 inch Schedule 40 pipe pages.
How to Read This DN80 Pipe Reference
NPS 3 and DN80 are nominal identifiers rather than direct statements of the pipe’s measured bore or outside diameter. For layout and coordination, use the listed outside diameter. For internal-flow reviews, use the listed inside diameter, while recognizing that actual flow calculations may also require the fluid, operating conditions, fittings, valves, and routing details.
The schedule identifies the wall-thickness designation associated with this pipe size. It should not be treated as a complete pressure-rating specification by itself. Material grade, manufacturing specification, temperature, corrosion allowance, joining method, and the governing design code may all affect engineering acceptance.
Practical Uses for the Dimension Data
- Use the outside diameter when checking supports, clamps, insulation space, sleeves, and equipment connection clearances.
- Use the wall thickness when preparing fabrication details, weld-joint information, and material descriptions.
- Use the inside diameter when beginning flow-area or hydraulic checks, then verify the result against the complete piping design basis.
- Use the listed unit weight for preliminary support, handling, and material-estimation work, including the separate water-filled value where applicable.
- Use the CAD and DWG reference library alongside the dimensional data when building 2D details or 3D piping models.
Checks Before Procurement or Fabrication
Before releasing a purchase description or spool drawing, confirm the nominal size, schedule, material specification, end preparation, length, coating or lining requirements, and applicable project standard. Also verify whether the drawing requires bare-pipe weight, fluid-filled weight, or additional loads from insulation, valves, fittings, and supports. The dimensions on this page are a reference for identification and coordination; final design approval remains subject to the project specifications and responsible engineer.
Additional Questions About 3 Inch Schedule 40 Pipe
Is the nominal size the same as the measured pipe diameter?
No. The nominal designation is used to identify the pipe size family. The measured outside and inside diameters are the values to use for physical layout and internal-flow calculations, respectively.
Does Schedule 40 alone establish the pipe pressure rating?
No. Pressure capability depends on more than schedule. The material specification, design temperature, corrosion allowance, joining details, and applicable code or project requirements must also be reviewed.
Which dimension should be used for a pipe support or clamp?
Use the listed outside diameter for support, clamp, sleeve, and clearance coordination. Confirm the selected hardware and any coating or insulation requirements against the project details.
Can the listed pipe weight be used for a final support design?
It can support preliminary estimating, but a final support design should account for the complete operating condition, including fluid, insulation, valves, fittings, dynamic effects, and other project-specific loads.