Use this page as a quick engineering reference when identifying Schedule 40 pipe 1 1/2 inch (DN40) for piping layouts, fabrication drawings, material takeoffs, and field coordination. The table below brings together the dimensional and weight information needed to check clearances, supports, connections, and installation assumptions.
When reviewing the data, distinguish the pipe’s nominal designation from its measured geometry. NPS 1 1/2 and DN40 identify the standard pipe size, while the outside diameter, inside diameter, and wall thickness describe the physical section used in design and drafting.
Schedule 40 pipe 1 1/2 inch (DN40) is a standard steel pipe size commonly used in piping design, fabrication, drafting, and engineering estimation work. This page provides the standard dimensions and weight data for NPS 1 1/2 Schedule 40 pipe based on ANSI / ASME B36.10, including outside diameter, inside diameter, wall thickness, and weight per meter.
This size is widely used in industrial piping systems, utility services, water lines, and fabrication projects where accurate dimensional data is important for layout, support design, material takeoff, and installation planning.
1 1/2 Inch Schedule 40 Pipe Dimensions
- Nominal Pipe Size (NPS): 1 1/2 inch
- Diameter Nominal (DN): DN40
- Pipe Schedule: Schedule 40
- Outside Diameter (OD): 48.3 mm
- Wall Thickness: 3.68 mm
- Inside Diameter (ID): 40.94 mm
- Pipe Weight: 4.05 kg/m
- Pipe Weight Including Water: 5.36 kg/m
- Reference Standard: ANSI / ASME B36.10
Schedule 40 Pipe 1 1/2 Inch (DN40) Data Table
| NPS | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 1 1/2 inch | DN40 | 48.3 | 3.68 | 40.94 | 4.05 |
What Is 1 1/2 Inch Schedule 40 Pipe Used For?
1 1/2 inch Schedule 40 pipe is commonly used in industrial and utility piping systems where a standardized steel pipe size is required. Engineers, designers, and fabricators often use this size in water distribution systems, cooling water piping, industrial utility lines, process piping systems, mechanical piping layouts, and fabrication work.
Because this is a practical and widely used pipe size, accurate dimensions and weight data are important for support design, installation work, material estimation, and field coordination.
Why These Dimensions Matter in Engineering
In piping and mechanical design, standard pipe dimensions are important for more than simple identification. The outside diameter is used for supports, clamps, insulation sizing, and equipment connection layouts. The inside diameter affects internal flow area and hydraulic calculations. The wall thickness is important for fabrication, welding preparation, and pipe strength, while the pipe weight per meter is essential for support load calculations and installation planning.
Using the correct DN40 Schedule 40 pipe dimensions helps reduce drafting errors, procurement mistakes, and field fit-up problems during construction and fabrication work.
1 1/2 Inch DN40 Schedule 40 Pipe for CAD and Drafting Work
For CAD, BIM, and piping drafting work, this size is commonly listed as NPS 1 1/2 or DN40. The standard OD of 48.3 mm is especially useful for routing clearance, support detailing, and nozzle or equipment connection references in both 2D drawings and 3D models.
This page can be used as a quick reference for 1 1/2 inch Schedule 40 pipe dimensions, DN40 pipe dimensions, and Schedule 40 steel pipe weight per meter during design, drafting, and estimation work.
Frequently Asked Questions
What is the outside diameter of 1 1/2 inch Schedule 40 pipe?
The outside diameter of 1 1/2 inch Schedule 40 pipe is 48.3 mm.
What is the wall thickness of DN40 Schedule 40 pipe?
The wall thickness is 3.68 mm.
What is the inside diameter of Schedule 40 pipe 1 1/2 inch?
The inside diameter is 40.94 mm.
How much does 1 1/2 inch Schedule 40 pipe weigh?
The pipe weight is 4.05 kg/m. The weight including water is 5.36 kg/m.
Which standard covers these dimensions?
These dimensions are based on ANSI / ASME B36.10.
Conclusion
Schedule 40 pipe 1 1/2 inch (DN40) is an important reference size for industrial piping, drafting, fabrication, and engineering calculations. With an OD of 48.3 mm, ID of 40.94 mm, wall thickness of 3.68 mm, and weight of 4.05 kg/m, it is a useful standard pipe size for engineers, designers, and estimators working with steel piping systems.
For more pipe schedule data, compare this size with nearby standard sizes such as 1 1/4 inch and 2 inch Schedule 40 pipe pages.
How to Read the DN40 Schedule 40 Data
The listed outside diameter is the key reference for external fit-up. Use it when checking clamps, guides, sleeves, insulation clearances, support details, and the space required around a routed pipe. The inside diameter is the relevant geometric reference for flow-area checks and internal access considerations.
The listed wall thickness describes the nominal pipe section used by the reference data. It should not be treated as a complete design qualification by itself. Material specification, manufacturing tolerance, corrosion allowance, joining method, temperature, pressure, and the applicable design rules may all affect final engineering decisions.
The dry pipe weight and the weight including water serve different estimating purposes. The dry value supports material takeoffs, handling, and pipe-support assessments, while the filled value helps reviewers consider the operating load when the line contains water. Other contents, insulation, valves, flanges, and support hardware require separate consideration.
Using This Reference in Drawings and Takeoffs
For CAD or BIM work, confirm that the selected library component uses the same nominal size and schedule as the project specification. A model can appear correct while still using a different wall thickness, material, connection type, or dimensional convention. Cross-check the component against the authoritative table on this page before issuing fabrication or installation drawings.
This reference also works well alongside related pipe schedule, fitting dimension, and flange reference pages. Comparing nearby nominal sizes can help identify routing changes, clearance impacts, and material-estimating differences without confusing nominal labels with actual outside diameters.
Practical Questions About Using This Reference
Does the nominal size equal the measured outside diameter?
No. The nominal designation is a standardized identification used for selection and communication. The measured geometry is represented separately by the outside diameter, inside diameter, and wall thickness listed in the reference data.
Can the listed pipe weight be used as the complete line load?
No. The pipe value is a useful starting point, but a complete line-load review may also need fluid contents, insulation, valves, fittings, flanges, supports, and other attached items.
Is Schedule 40 alone enough to select pipe for a project?
No. Schedule identifies a standardized dimensional class, but final selection should also be checked against the specified material, service conditions, joining requirements, corrosion allowance, design code, and project procurement requirements.
Why should CAD users verify the component library?
CAD and BIM libraries can contain similar nominal labels with different dimensions or connection details. Verifying the component against the reference table reduces coordination, clearance, and fabrication errors.