This reference provides the dimensional data and practical selection context for Schedule 80 Pipe 3 Inch (DN80). Use the listed outside diameter, inside diameter, wall thickness, and mass values when coordinating piping layouts, fittings, supports, transport, and fabrication documentation.
The page also explains how the schedule designation relates to pipe-wall thickness and why nominal size should not be treated as a direct measurement of the pipe outside or inside diameter. For related design work, compare this page with the site’s references on pipe dimensions, pipe schedules, and pipe fittings.
Schedule 80 Pipe 3 Inch (DN80) 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 88.9 mm, an inside diameter of 73.66 mm, a wall thickness of 7.62 mm, and a pipe weight of 15.27 kg/m.
Schedule 80 Pipe 3 Inch (DN80) Dimensions
- Pipe Standard: ANSI/ASME B36.10
- Nominal Pipe Size: 3 inch
- DN Size: DN80
- Outside Diameter (OD): 88.9 mm
- Inside Diameter (ID): 73.66 mm
- Wall Thickness: 7.62 mm
- Pipe Weight: 15.27 kg/m
- Pipe Weight Including Water: 19.52 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 3 Inch DN80 Pipe Dimensions Matter
Knowing the exact dimensions of a 3 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 3 Inch (DN80)
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
3 Inch Schedule 80 Pipe Data Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 3 inch | 80 | 88.9 | 73.66 | 7.62 | 15.27 |
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 Read the Schedule 80 DN80 Pipe Data
The values in the table should be read together rather than used in isolation. The outside diameter is the primary envelope dimension for fitting interfaces, clamps, guides, and support details. The inside diameter describes the available flow passage and is relevant to hydraulic checks, cleaning access, and connection transitions.
Wall thickness describes the radial material thickness represented by this schedule and affects the relationship between the outside and inside diameters. Schedule 80 is therefore a dimensional classification, not a complete statement of allowable pressure, temperature capability, corrosion life, or material performance.
Weight and support coordination
The listed pipe weight per meter is useful for estimating handling requirements and coordinating pipe supports. The separate water-included value helps indicate why an operating or filled line may impose a different support load than an empty pipe. Final support spacing, anchor loads, seismic restraint, and structural connections require project-specific engineering checks.
Checks before ordering or fabrication
- Confirm the material grade and applicable purchase specification.
- Verify the end preparation and connection type against the mating fitting, valve, or flange.
- Check design pressure, operating temperature, corrosion allowance, and fluid compatibility.
- Coordinate the dimensional data with the project piping class, fabrication drawings, and applicable code requirements.
- Use the available DWG reference as a drafting aid, then verify interfaces against the approved project model and procurement documents.
For adjacent design tasks, useful companion references include flange dimensions, pipe support terminology, and piping terminology. These links help readers move from a dimensional lookup to practical layout and installation decisions without treating a schedule designation as a complete design specification.
Important distinction: nominal size versus measured size
NPS and DN are identification conventions used to describe a nominal pipe size. They are not interchangeable with a direct measurement taken at the job site. When a connection, replacement, or retrofit must fit existing piping, verify the actual interface requirements, component standard, end condition, and project tolerances before fabrication.
Frequently Asked Questions
What does Schedule 80 mean for this pipe?
Schedule 80 identifies a pipe-wall thickness category for the nominal size. Compared with a lighter schedule of the same nominal size, it generally has a thicker wall and a smaller flow passage. The schedule alone does not define material grade or allowable operating conditions.
Is DN80 the measured outside diameter?
No. DN80 is a nominal identification designation. The applicable outside and inside diameters are the dimensional values provided in the reference data, and those values should be used when checking fittings, supports, clearances, and layout interfaces.
Why are both pipe weight and pipe weight including water shown?
The two values support different coordination tasks. Pipe-only weight is useful for handling and empty-line calculations, while the water-included value gives a more representative basis for considering a filled line. Other contents, insulation, valves, fittings, and support hardware may add further load.
Does Schedule 80 establish the pipe pressure rating?
No. Pressure suitability depends on factors such as material, temperature, corrosion allowance, manufacturing requirements, joining method, and the governing project code. Confirm the complete piping specification before selecting the pipe for service.
Can the DWG file be used directly for fabrication?
The DWG is a reference resource for drafting and coordination. Before fabrication, compare it with the approved project drawings, connection details, procurement specification, and verified component interfaces.