This reference provides a practical overview of Schedule 80 Pipe 1 1/2 Inch (DN40) for engineers, detailers, fabricators, and buyers checking a piping layout or material list. Use the dimensional data below when coordinating pipe with fittings, flanges, supports, clamps, and connected equipment.
For related design work, compare this page with the site’s pipe dimensions reference and pipe schedule guide. Those resources help explain how nominal size, outside diameter, inside diameter, and wall classification are used together rather than treated as interchangeable terms.
Schedule 80 Pipe 1 1/2 Inch (DN40) is a heavy wall steel pipe commonly used in industrial piping systems that require higher strength and thicker pipe walls than lighter schedules. This pipe size is based on ANSI/ASME B36.10 and is widely used in process piping, utility systems, water treatment plants, and mechanical services. For this size, the standard data shows an outside diameter of 48.3 mm, an inside diameter of 38.14 mm, a wall thickness of 5.08 mm, and a pipe weight of 5.41 kg/m.
Schedule 80 Pipe 1 1/2 Inch (DN40) Dimensions
- Pipe Standard: ANSI/ASME B36.10
- Nominal Pipe Size: 1 1/2 inch
- DN Size: DN40
- Outside Diameter (OD): 48.3 mm
- Inside Diameter (ID): 38.14 mm
- Wall Thickness: 5.08 mm
- Pipe Weight: 5.41 kg/m
- Pipe Weight Including Water: 6.55 kg/m
What Is Schedule 80 Pipe?
Schedule 80 refers to a pipe wall thickness classification. For the same nominal pipe size, a Schedule 80 pipe has a thicker wall and a smaller inside diameter than lower schedule pipes. This makes it a practical choice for systems that need additional pipe strength, durability, and long-term service performance.
Why 1 1/2 Inch DN40 Pipe Dimensions Matter
Knowing the exact dimensions of a 1 1/2 inch Schedule 80 pipe is important for piping design, fabrication, and installation. The outside diameter helps with flange matching, clamps, and supports. The inside diameter affects flow area and system capacity. The wall thickness is important for strength and service conditions, while the pipe weight per meter is useful for transport, lifting plans, and structural support calculations.
Common Uses of Schedule 80 Pipe 1 1/2 Inch (DN40)
This pipe size is often used in industrial and commercial piping systems such as:
- Water treatment and utility piping
- Process and plant piping systems
- Oil and gas applications
- Pump stations and mechanical services
- Heavy-duty industrial pipe networks
1 1/2 Inch Schedule 80 Pipe Data Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 1 1/2 inch | 40 | 48.3 | 38.14 | 5.08 | 5.41 |
Additional Information for Engineers and Buyers
Before selecting this pipe size, it is also important to review the material grade, end type, design pressure, corrosion allowance, operating temperature, and project code requirements. While Schedule 80 defines the dimensional wall category, the final pipe selection should always match the actual service condition and engineering specification.
Note: NPS means nominal pipe size in inches, while DN means diameter nominal in millimeters. These are standard reference sizes used for pipe identification.
How to Use This Schedule 80 DN40 Reference
The source data on this page is useful at several stages of a piping project. Designers can use the outside diameter when checking physical fit and connection alignment, while the inside diameter is relevant to hydraulic review and equipment interfaces. Fabricators and installers can use the wall dimension and nominal identification when preparing shop drawings, cutting lists, and connection details.
Schedule is a wall classification, not a complete material or pressure specification. The schedule designation should therefore be reviewed alongside the material grade, joining method, corrosion allowance, operating temperature, design pressure, and governing project requirements. A schedule designation by itself does not establish whether a pipe is acceptable for a particular service.
Coordination with Fittings, Flanges, and Supports
When coordinating this pipe with fittings or flanges, check the connection standard and the matching nominal size. The outside diameter is especially important for clamp clearances, support hardware, penetrations, and space around insulation. The pipe mass should also be considered in hanger spacing, lifting arrangements, transport planning, and support-load calculations. Final support design requires project-specific engineering review.
Using the CAD Reference
The accompanying DWG download can support drafting and layout coordination. Treat the CAD file as a reference aid and verify its geometry against the authoritative dimensional table before using it in fabrication, procurement, or construction documents. Confirm units, layers, insertion scale, connection details, and project-specific tolerances in the receiving drawing.
Related Pipe Reference Topics
- Pipe fittings and connection terminology for coordinating elbows, tees, reducers, and other components.
- Pipe flange dimensions and selection guidance for checking mating components and bolted connections.
- Pipe weight and support-load guidance for preliminary handling and layout checks.
- Piping CAD and DWG resources for drafting workflows and file coordination.
Frequently Asked Questions
What does Schedule 80 mean for 1 1/2 inch pipe?
Schedule 80 identifies a relatively thicker wall classification for this nominal pipe size. Compared with a lighter schedule of the same nominal size, it generally has more wall material and less internal passage. The applicable dimensional data is listed in the table on this page.
Are 1 1/2 inch and DN40 the same identification?
They are corresponding nominal pipe identifiers used in different sizing conventions. NPS uses an inch-based nominal designation, while DN is a metric nominal designation. Neither label should be treated as the measured outside diameter.
Can Schedule 80 alone determine the pipe pressure rating?
No. Pressure suitability depends on factors such as material, temperature, allowable stress, joint details, corrosion allowance, and the governing design code. Confirm the complete project specification before approving the pipe for service.
Why are both outside and inside diameter important?
The outside diameter helps coordinate fittings, flanges, clamps, supports, and clearances. The inside diameter affects the available flow passage and should be checked during hydraulic and equipment-interface reviews.
Is the DWG file ready for fabrication?
The DWG is provided as a drafting reference. Verify its units, scale, geometry, connection details, and the authoritative dimensional table before using it for fabrication or construction.