This reference explains how to read the dimensions and weight data for 1 1/4 inch DN32 Schedule XXS pipe. Use the table for fabrication checks, material takeoff, support-load review, transport planning, and comparison with other pipe schedules.
Because XXS is a heavy-wall designation, the relationship between outside diameter, inside diameter, wall thickness, and mass is especially important. The accompanying DWG download can also support drafting and layout workflows, but project drawings and purchasing documents should be checked against the governing specification.
Schedule XXS Pipe 1 1/4 Inch (DN32) 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 1 1/4 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.
1 1/4 Inch Schedule XXS Pipe Dimensions
- Pipe Size: 1 1/4 Inch
- Nominal Diameter: DN32
- Pipe Schedule: XXS (Double Extra Strong)
- Outside Diameter (OD): 42.2 mm
- Inside Diameter (ID): 22.8 mm
- Wall Thickness: 9.7 mm
- Pipe Weight: 7.77 kg/m
- Pipe Weight Including Water: 8.17 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule XXS Pipe 1 1/4 Inch Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 1 1/4″ | 32 | 42.2 | 22.8 | 9.7 | 7.77 |
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 1 1/4 inch DN32 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 1 1/4 Inch DN32 XXS Pipe Dimensions Matter
Knowing the exact dimensions of 1 1/4 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 1 1/4 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 1 1/4 inch, the actual outside diameter is 42.2 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 1 1/4 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 Use This XXS Pipe Reference
The dimension list and table are useful for different stages of engineering and fabrication work. The outside diameter helps with fit-up, clamps, sleeves, fittings, and layout clearances. The inside diameter is the relevant dimensional reference when reviewing the available flow passage. Wall thickness supports cutting, beveling, welding, and inspection planning.
The listed pipe weight is useful for estimating material quantities, handling requirements, and support reactions. The water-inclusive value should be treated separately from the bare-pipe value because fluid-filled pipe affects support and lifting considerations. Final support, lifting, and structural decisions require project-specific engineering review.
Related Pipe-Dimension References
For a broader design review, compare this entry with related pipe schedules, NPS and DN size references, steel pipe weight tables, and pipe fitting dimensions. These related resources help clarify how schedule changes affect the internal passage and mass while maintaining the nominal pipe-size designation.
Drafting and Procurement Checks
- Confirm that the drawing, bill of materials, and purchase description use the same nominal size and schedule.
- Check the specified material, end preparation, length, tolerances, and applicable project requirements separately from the dimensional reference.
- Use the outside diameter when coordinating connections and clearances, and use the inside diameter when reviewing flow or internal access.
- Review the DWG with the project’s piping, fitting, and support details before issuing fabrication documents.
Frequently Asked Questions
What does XXS mean for this pipe?
XXS means Double Extra Strong, a heavy-wall pipe designation. Compared with lighter schedule options for the same nominal size, it changes the wall thickness, inside diameter, weight, fabrication requirements, and handling considerations.
Are NPS and DN the same measurement?
No. NPS and DN are nominal size designations used to identify a pipe size. They are not direct substitutes for the measured outside diameter or inside diameter.
Which dimension should be used for fitting and layout checks?
The outside diameter is generally the key dimensional reference for external fit-up, sleeves, clamps, and layout clearances. Connection details must still be checked against the applicable fitting or flange dimensions.
Why does the inside diameter change between schedules?
For a given nominal pipe size, schedule changes alter the wall thickness. That changes the remaining internal passage, so the inside diameter and pipe weight must be reviewed for the selected schedule.
Can the listed weight be used for support design?
The listed weight is a useful input for preliminary load review, material takeoff, and handling planning. Support design should also account for the project configuration, contents, insulation, fittings, operating conditions, and applicable design requirements.
Is the DWG file sufficient for fabrication?
The DWG is a drafting reference for this pipe entry. Before fabrication, verify the drawing against the project specification, connection details, material requirements, tolerances, and approved fabrication documents.