This reference is intended for engineers, designers, estimators, fabricators, and procurement teams who need to identify 1 1/4 inch Schedule XS pipe quickly and use its dimensional data correctly. The table and listed values below are the controlling local reference for this page.
Use the dimensional information together with related pipe schedule, fitting, flange, and piping terminology references when developing layouts, checking connections, or preparing material takeoffs. A nominal pipe size is a designation rather than a direct statement of the measured outside or inside diameter, so the listed OD, ID, and wall thickness should be used for practical drafting and fabrication work.
Schedule XS Pipe 1 1/4 Inch (DN32) is a steel pipe size commonly used in industrial piping systems, utility lines, water transmission projects, plant construction, and fabrication work. This page provides a practical reference for the main dimensions and weight of 1 1/4 inch XS pipe based on ANSI/ASME B36.10.
For piping engineers, CAD 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 XS Pipe Dimensions
- Pipe Size: 1 1/4 Inch
- Nominal Diameter: DN32
- Pipe Schedule: XS (Extra Strong)
- Outside Diameter (OD): 42.2 mm
- Inside Diameter (ID): 32.5 mm
- Wall Thickness: 4.85 mm
- Pipe Weight: 4.47 kg/m
- Pipe Weight Including Water: 5.29 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule XS Pipe 1 1/4 Inch Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 1 1/4″ | 32 | 42.2 | 32.5 | 4.85 | 4.47 |
What Does Schedule XS Mean?
Schedule XS stands for Extra Strong. It is a pipe wall designation used in steel pipe standards. The selected schedule affects the wall thickness, which directly affects the inside diameter, pipe weight, fabrication requirements, and support loading.
For a size such as 1 1/4 inch DN32 pipe, wall thickness remains important because it affects total pipe weight, handling requirements, support loads, and installation planning in real projects.
Why 1 1/4 Inch DN32 Pipe Dimensions Matter
Knowing the exact dimensions of 1 1/4 inch Schedule XS 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: Accurate weight data supports safer handling and planning.
- Schedule Comparison: Engineers often compare XS with STD, Sch 40, Sch 60, or Sch 80 during design review.
Typical Applications of 1 1/4 Inch Schedule XS Pipe
This pipe size may be used in:
- Industrial process piping
- Water transmission systems
- Power and utility projects
- Plant piping works
- Infrastructure construction
- 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 Pipe Reference
The most useful way to read a pipe dimension entry is to separate the nominal designation from the physical dimensions. NPS and DN identify the nominal size, while the outside diameter, inside diameter, and wall thickness describe the pipe itself. These values serve different purposes during design and fabrication.
Nominal Size Versus Measured Dimensions
The 1 1/4 inch and DN32 labels help identify the pipe size across drawings, specifications, and purchasing documents. They should not be treated as a direct measurement of the pipe’s outside diameter. For connection design, CAD modeling, and fit-up checks, use the OD and wall thickness shown in the source data.
Why Wall Thickness Affects More Than Weight
Schedule XS identifies the extra-strong wall designation. Increasing wall thickness reduces the available internal diameter while increasing the amount of steel in the pipe. As a result, schedule selection can affect flow-area review, weld preparation, handling, support loading, and the compatibility of connected components.
Using the Data in Drawings and Takeoffs
- Use the OD when checking the physical envelope, clamps, sleeves, and connection geometry.
- Use the ID when reviewing internal passage dimensions or comparing flow paths.
- Use wall thickness for fabrication notes, fit-up review, and material identification.
- Use pipe weight for preliminary handling, transport, and support-load checks.
- Check the applicable project specification, material grade, end preparation, corrosion allowance, and dimensional tolerances before finalizing a design.
CAD and Fabrication Workflow
For CAD or DWG work, model the pipe using the listed OD and wall thickness rather than relying only on the nominal size label. Confirm that fittings, flanges, valves, and branch connections use compatible dimensional references. The downloadable drawing associated with this page can support drafting workflows, but project-specific connection details and fabrication requirements still require verification.
Important Design Boundary
The listed dimensions and weights are reference data, not a substitute for a complete piping or structural design review. Pressure rating, material suitability, corrosion, temperature, joining method, support spacing, and code requirements must be evaluated against the project specification and the responsible engineer’s requirements.
Frequently Asked Questions
What does 1 1/4 inch DN32 identify?
It identifies the pipe’s nominal size using both the NPS and DN naming systems. The physical OD and ID should be taken from the dimensional data rather than inferred from the nominal label.
What does XS mean in pipe sizing?
XS means Extra Strong. It is a pipe wall designation that indicates the wall-thickness category and influences the resulting inside diameter and pipe weight.
Does changing the schedule change the outside diameter?
For the same nominal pipe size, the outside diameter generally remains the dimensional reference used for the size, while wall thickness, inside diameter, and weight change with the schedule. Always verify the applicable table before using a different schedule in a drawing or takeoff.
Can this data be used directly for a pipe support design?
The listed pipe weight can support preliminary planning, but a final support design also requires consideration of operating contents, insulation, valves, fittings, loads, support spacing, and project requirements. Engineering verification is required before construction.