This reference page is intended for engineers, designers, drafters, fabricators, estimators, and students who need a quick lookup for 1 1/4 inch Schedule 10 pipe. The source data identifies the NPS size, DN designation, outside diameter, wall thickness, inside diameter, and pipe weight in metric units.
Use the dimension list and data table as the primary lookup, then review the explanatory notes before using the information in a drawing, material takeoff, support study, or fabrication package. For related references, see the site’s pipe dimensions, pipe schedule, and pipe fittings resources.
Schedule 10 pipe 1 1/4 inch (DN32) is a standard steel pipe size commonly used in piping design, fabrication, drafting, and estimation work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 1 1/4 Schedule 10 pipe based on ASME B36.10.
1 1/4 Inch Schedule 10 Pipe Dimensions
- Nominal Pipe Size (NPS): 1 1/4 inch
- Diameter Nominal (DN): DN32
- Outside Diameter (OD): 42.2 mm
- Wall Thickness: 2.77 mm
- Inside Diameter (ID): 36.66 mm
- Pipe Weight: 2.69 kg/m
- Pipe Weight Filled With Water: 3.74 kg/m
- Reference Standard: ASME B36.10
Schedule 10 Pipe 1 1/4 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 1 1/4 inch | 32 | 42.2 | 2.77 | 36.66 | 2.69 |
What Does Schedule 10 Mean?
Schedule 10 refers to the wall thickness series of the pipe. For the same nominal pipe size, the outside diameter remains fixed while the wall thickness changes depending on the schedule. A thicker wall generally increases pipe weight and reduces the inside diameter.
Typical Uses of 1 1/4 Inch Schedule 10 Pipe
NPS 1 1/4 Schedule 10 pipe is commonly used in utility systems, water lines, low-pressure process piping, drainage applications, and general fabrication work where a lighter wall thickness is suitable. It is also a practical reference size for material takeoff, support planning, and piping layout.
Why Pipe Weight Matters
Pipe weight per meter is important for transport planning, support design, structural loading, fabrication estimates, and lifting calculations. Even in smaller piping systems, installed weight can affect support spacing, handling methods, and project cost.
1 1/4 Inch Schedule 10 Pipe Calculation Notes
The listed weight is based on standard steel pipe dimension data using the outside diameter and wall thickness of the pipe. Actual product weight may vary slightly depending on manufacturing tolerance, material grade, and supplier standard.
Frequently Asked Questions
What is the outside diameter of 1 1/4 inch Schedule 10 pipe?
The outside diameter is 42.2 mm.
What is the wall thickness of DN32 Schedule 10 pipe?
The wall thickness is 2.77 mm.
What is the inside diameter of NPS 1 1/4 Schedule 10 pipe?
The inside diameter is 36.66 mm.
How much does 1 1/4 inch Schedule 10 pipe weigh?
The approximate weight is 2.69 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for welded and seamless wrought steel pipe.
Conclusion
Schedule 10 pipe 1 1/4 inch (DN32) has an outside diameter of 42.2 mm, wall thickness of 2.77 mm, inside diameter of 36.66 mm, and a weight of 2.69 kg/m. It is a useful reference for piping design, drafting, estimating, and fabrication work.
How to Read This Pipe Reference
NPS 1 1/4 and DN32 are nominal size designations. They identify the pipe size category, but they should not be treated as a direct measurement of the outside or inside diameter. The dimensional values in the source table are the values to use when checking clearances, preparing drawings, or coordinating fittings.
The outside diameter is useful for layout, clamps, supports, sleeves, and connection coordination. The wall thickness distinguishes this Schedule 10 entry from other schedule selections for the same nominal size. The listed inside diameter is the internal flow opening, while the weight values support handling, estimating, and load-review activities.
Schedule, Dimension, and Design Checks
A schedule identifies a wall-thickness series; it is not, by itself, a complete design qualification or pressure-rating statement. Before selecting pipe for a project, confirm the applicable material specification, manufacturing requirements, corrosion allowance, joining method, temperature and pressure conditions, and governing design code. The dimension data on this page should be coordinated with the project specification and the manufacturer’s documentation.
Using the Data in Drawings and Takeoffs
- Use the outside diameter when checking routing space, support hardware, insulation interfaces, and penetration details.
- Use the wall thickness and inside diameter when reviewing section details and coordinating with process or hydraulic calculations.
- Use the pipe weight for preliminary material estimates, handling reviews, and support-load coordination; verify the final installed condition separately.
- Use the linked DWG resource as a drafting starting point, then confirm units, layer conventions, connection details, and project-specific tolerances before issuing a drawing.
For broader comparison work, link this page from a pipe weight reference or a pipe dimensions chart. A comparison page can help readers distinguish changes in wall thickness and weight without confusing nominal size with measured diameter.
Additional Practical Questions
Is DN32 the measured inside diameter?
No. DN32 is a nominal designation. Use the source table’s outside diameter, wall thickness, and inside diameter when a drawing or calculation requires a physical dimension.
Can the listed pipe weight be used as the final installed load?
It can support preliminary planning, but the final load review should account for the actual pipe, contents, coatings, insulation, valves, fittings, supports, and project requirements.
Does Schedule 10 alone establish whether the pipe is acceptable for a service?
No. Service acceptance requires coordination with the applicable material, design, fabrication, inspection, and project requirements. A qualified engineer should verify the selection.
What should be checked before using the DWG file?
Check the drawing units, scale, geometry, layer settings, connection interfaces, and project drafting standards. Treat the CAD file as a reference resource and verify it against the authoritative dimension data before release.