This reference is intended for engineers, designers, estimators, fabricators, and drafting teams checking 3 inch Schedule XXS pipe dimensions. Use the dimensional data below when reviewing layouts, material takeoffs, fabrication details, support loads, and installation documentation.
Because XXS is a heavy-wall designation, the nominal size alone does not describe the available internal opening or handling weight. The table and notes provide the dimensional context needed to interpret this pipe size consistently across design and fabrication work.
Schedule XXS Pipe 3 Inch (DN80) is a heavy-wall steel pipe size used in industrial piping systems, plant construction, high-duty utility lines, and fabrication work. This page provides a practical reference for the main dimensions and weight of 3 inch XXS pipe based on ANSI/ASME B36.10.
For piping engineers, designers, estimators, fabrication teams, and site supervisors, accurate pipe size data is important for layout work, material takeoff, support design, transport planning, and installation checks. This guide presents the essential dimensions in a cleaner format that adds more value than a simple size table.
3 Inch Schedule XXS Pipe Dimensions
- Pipe Size: 3 Inch
- Nominal Diameter: DN80
- Pipe Schedule: XXS (Double Extra Strong)
- Outside Diameter (OD): 88.9 mm
- Inside Diameter (ID): 58.42 mm
- Wall Thickness: 15.24 mm
- Pipe Weight: 27.68 kg/m
- Pipe Weight Including Water: 30.35 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule XXS Pipe 3 Inch Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 3″ | 80 | 88.9 | 58.42 | 15.24 | 27.68 |
What Does Schedule XXS Mean?
Schedule XXS means Double Extra Strong. It is a heavy-wall pipe designation used for applications that need thicker pipe walls than standard or lighter schedules. A thicker wall affects the inside diameter, pipe weight, fabrication requirements, support loading, and handling during installation.
For a size such as 3 inch DN80 pipe, the jump to XXS creates a much heavier pipe than lighter schedules, so correct dimension and weight data are important for design, lifting, and field work.
Why 3 Inch DN80 XXS Pipe Dimensions Matter
Knowing the exact dimensions of 3 inch Schedule XXS pipe is useful for several engineering and construction tasks:
- Fabrication: OD and wall thickness are needed for cutting, beveling, welding, and fit-up work.
- Support Design: Pipe weight per meter helps engineers check support spacing and structural loads.
- Flow Review: ID is useful for estimating internal flow area and hydraulic performance.
- Transport and Lifting: Heavy-wall pipes require accurate weight data for safer handling and crane planning.
- Schedule Comparison: Engineers often compare XXS with XS, STD, Sch 80, Sch 160, or other heavy-wall options during design review.
Typical Applications of 3 Inch Schedule XXS Pipe
This pipe size may be used in:
- Heavy-duty industrial piping
- High-pressure process systems
- Power and utility projects
- Plant piping works
- Oil and gas facilities
- Custom steel fabrication and spool projects
Engineering Notes
NPS means Nominal Pipe Size, while DN means Diameter Nominal. Although this pipe is called 3 inch, the actual outside diameter is 88.9 mm according to the standard. The inside diameter changes with the pipe schedule because wall thickness changes from one schedule to another.
That means if you compare the same 3 inch pipe in a different schedule, the OD usually stays the same, while the ID, wall thickness, and pipe weight will change.
Reference
The dimension data on this page is based on ANSI/ASME B36.10, which is widely used for steel pipe dimensions in industrial applications.
How to Read the 3 Inch XXS Pipe Data
The listed outside diameter is the primary envelope dimension for layout, clamps, fittings, and fabrication checks. The wall thickness defines how much of that envelope is occupied by steel, while the inside diameter indicates the remaining internal passage.
The page also separates dry pipe weight from pipe weight including water. That distinction is useful when reviewing support loads, temporary filling conditions, lifting plans, and transport requirements. Actual project calculations should also account for the specified material, corrosion allowance, contents, insulation, coatings, fittings, and project loading criteria where applicable.
Related Pipe Reference Topics
For broader dimensional checks, compare this page with references covering NPS and DN pipe terminology, pipe schedules, outside diameter and inside diameter, and pipe weight calculations. These topics help explain why pipes sharing a nominal size can have different internal openings and weights.
When the dimensions are being transferred into drawings, the available Schedule XXS Pipe 3 Inch DN80 DWG can support drafting and spool-reference work. Confirm the drawing against the project specification and the applicable connection, fitting, and fabrication requirements before issuing construction documents.
Design and Verification Considerations
- Use the outside diameter for physical layout and interface checks.
- Use the inside diameter when reviewing flow space or internal clearance.
- Use wall thickness for fabrication, welding, bevel, and fit-up coordination.
- Use the applicable weight value when reviewing supports, lifting, transport, and installation planning.
- Do not infer a complete pressure rating from the XXS designation alone; confirm material, temperature, design pressure, joining method, and project requirements separately.
Frequently Asked Questions
What is the nominal size of XXS pipe covered on this page?
The pipe is identified as 3 inch and DN80. NPS and DN are nominal designations, so they should not be read as the exact measured outside or inside diameter.
What is the outside diameter of 3 inch Schedule XXS pipe?
The listed outside diameter is 88.9 mm. This is the envelope dimension used for many layout and fabrication checks.
Why is the inside diameter smaller than the nominal pipe size?
The nominal size is an identification system rather than a direct inside-diameter measurement. The heavy XXS wall occupies part of the pipe cross-section, leaving the listed inside diameter of 58.42 mm.
What is the wall thickness of this 3 inch XXS pipe?
The listed wall thickness is 15.24 mm. Confirm the applicable product documentation and project requirements before using it for detailed fabrication or design calculations.
What is the weight of 3 inch Schedule XXS pipe?
The listed pipe weight is 27.68 kg/m. The page also gives a separate value of 30.35 kg/m for pipe weight including water. Select the value that matches the condition being evaluated.
Does XXS alone define the pipe pressure rating?
No. XXS identifies a heavy-wall dimensional category. Pressure design requires additional information, including material, design conditions, temperature, manufacturing requirements, joints, and the governing project or piping specification.
Where can the DWG reference be used?
The downloadable DWG can assist with drafting, layout, and spool-reference work. Review it against the dimensional table and project requirements before using it in issued design or fabrication documents.