This reference page is for engineers, drafters, fabricators, estimators, and purchasing teams checking 1 1/2 inch Schedule 10 pipe data. Use the dimension list and table below when comparing nominal pipe size, outside diameter, wall thickness, inside diameter, and mass per unit length.
The page also clarifies how the Schedule designation relates to the pipe wall and why the distinction between NPS and DN matters when coordinating piping specifications, fittings, flanges, and drawings. For broader comparisons, review the site’s related pipe schedules, steel pipe dimensions, and pipe weight references.
Schedule 10 pipe 1 1/2 inch (DN40) 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 1/2 Schedule 10 pipe based on ASME B36.10.
1 1/2 Inch Schedule 10 Pipe Dimensions
- Nominal Pipe Size (NPS): 1 1/2 inch
- Diameter Nominal (DN): DN40
- Outside Diameter (OD): 48.3 mm
- Wall Thickness: 2.77 mm
- Inside Diameter (ID): 42.76 mm
- Pipe Weight: 3.11 kg/m
- Pipe Weight Filled With Water: 4.54 kg/m
- Reference Standard: ASME B36.10
Schedule 10 Pipe 1 1/2 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 1 1/2 inch | 40 | 48.3 | 2.77 | 42.76 | 3.11 |
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 1/2 Inch Schedule 10 Pipe
NPS 1 1/2 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 1/2 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 1/2 inch Schedule 10 pipe?
The outside diameter is 48.3 mm.
What is the wall thickness of DN40 Schedule 10 pipe?
The wall thickness is 2.77 mm.
What is the inside diameter of NPS 1 1/2 Schedule 10 pipe?
The inside diameter is 42.76 mm.
How much does 1 1/2 inch Schedule 10 pipe weigh?
The approximate weight is 3.11 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 1/2 inch (DN40) has an outside diameter of 48.3 mm, wall thickness of 2.77 mm, inside diameter of 42.76 mm, and a weight of 3.11 kg/m. It is a useful reference for piping design, drafting, estimating, and fabrication work.
How to Read This Pipe Reference
The data below separates the nominal designation from the physical dimensions. NPS 1 1/2 and DN40 identify the nominal size used for piping coordination; they should not be treated as a direct statement of the measured inside or outside diameter. The table provides those physical dimensions separately for drafting, estimating, and fabrication checks.
Using outside diameter and wall thickness
Outside diameter is important when checking clearances, clamps, supports, sleeves, fittings, and connection details. Wall thickness is used when reviewing the pipe section shown on drawings and when distinguishing one schedule from another. The inside diameter is useful for internal-flow references and for checking the opening available through the pipe, but final system performance also depends on the complete design and applicable project requirements.
Schedule selection is not a complete design decision
Schedule identifies a wall-thickness series; it does not by itself establish material grade, joining method, allowable pressure, corrosion allowance, temperature limit, or code compliance. Before procurement or construction, verify the project piping specification, material requirements, applicable design code, and supplier documentation. The dimension data on this page should therefore be used as a reference alongside the governing engineering documents.
Practical drafting and estimating checks
- Confirm that the drawing uses the intended nominal size and schedule.
- Coordinate the pipe outside diameter with supports, penetrations, insulation, and nearby equipment.
- Use the listed mass data when preparing preliminary material takeoffs, handling plans, and support-load checks.
- Check the accompanying DWG resource when a CAD reference is needed for layout or detailing.
Related internal references may include pipe fittings, pipe flanges, pipe support design, pipe schedule charts, and steel pipe CAD blocks.
Additional Reference Questions
Is Schedule 10 the same thing as DN40?
No. DN40 identifies the nominal size designation, while Schedule 10 identifies the wall-thickness series associated with that nominal pipe size.
Can the listed dimensions be used to approve a piping system?
No. The dimensions are useful for reference, coordination, drafting, and estimating. System approval also requires review of the specified material, design conditions, joining details, applicable code, and project requirements.
Why should the pipe weight be checked during layout?
Pipe mass can affect support reactions, handling, lifting, transportation, and preliminary structural coordination. The contents of the piping system and any added components should also be considered separately.
What should be checked before ordering this pipe?
Confirm the nominal size, schedule, material specification, manufacturing requirements, end preparation, quantity, and supplier documentation against the project specification and purchase documents.