4 inch Schedule 40 pipe is identified in engineering documents by both its nominal pipe size, NPS 4, and its metric designation, DN100. The nominal size should not be treated as the measured outside diameter; use the dimensional data on this page when preparing layouts, supports, connection details, or material takeoffs.
The schedule designation identifies a standardized wall-thickness series. It does not, by itself, establish the pipe material, allowable pressure, corrosion allowance, or suitability for a particular service. Those items must be confirmed against the project specification, procurement documents, and the applicable engineering design requirements.
Schedule 40 pipe 4 inch (DN100) 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 4 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.
4 Inch Schedule 40 Pipe Dimensions
- Nominal Pipe Size (NPS): 4 inch
- Diameter Nominal (DN): DN100
- Pipe Schedule: Schedule 40
- Outside Diameter (OD): 114.3 mm
- Wall Thickness: 6.02 mm
- Inside Diameter (ID): 102.26 mm
- Pipe Weight: 16.08 kg/m
- Pipe Weight Including Water: 24.28 kg/m
- Reference Standard: ANSI / ASME B36.10
Schedule 40 Pipe 4 Inch (DN100) Data Table
| NPS | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 4 inch | DN100 | 114.3 | 6.02 | 102.26 | 16.08 |
What Is 4 Inch Schedule 40 Pipe Used For?
4 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
- Plant layout and pipe routing work
- Fabrication and spool drawing preparation
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 DN100 Schedule 40 pipe dimensions helps reduce drafting errors, procurement mistakes, and field fit-up problems during construction and fabrication work.
4 Inch DN100 Schedule 40 Pipe for CAD and Drafting Work
For CAD, BIM, and piping drafting work, this size is commonly listed as NPS 4 or DN100. The standard OD of 114.3 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 4 inch Schedule 40 pipe dimensions, DN100 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 4 inch Schedule 40 pipe?
The outside diameter of 4 inch Schedule 40 pipe is 114.3 mm.
What is the wall thickness of DN100 Schedule 40 pipe?
The wall thickness is 6.02 mm.
What is the inside diameter of Schedule 40 pipe 4 inch?
The inside diameter is 102.26 mm.
How much does 4 inch Schedule 40 pipe weigh?
The pipe weight is 16.08 kg/m. The weight including water is 24.28 kg/m.
Which standard covers these dimensions?
These dimensions are based on ANSI / ASME B36.10.
Conclusion
Schedule 40 pipe 4 inch (DN100) is an important reference size for industrial piping, drafting, fabrication, and engineering calculations. With an OD of 114.3 mm, ID of 102.26 mm, wall thickness of 6.02 mm, and weight of 16.08 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 3 inch, 3 1/2 inch, and 5 inch Schedule 40 pipe pages.
How to Use This DN100 Pipe Reference
Use the data table as the dimensional reference for checking drawings, comparing vendor information, and preparing fabrication or estimation documents. The outside diameter is the key envelope dimension for supports, clamps, insulation clearances, sleeves, and equipment interfaces. The inside diameter is the relevant geometric dimension for flow-area and hydraulic evaluations.
Keep pipe-only weight separate from the listed weight including water. The first supports material-handling and structural load checks for the pipe itself, while the second provides a reference for a water-filled condition. Actual design loads may also include insulation, fittings, valves, contents, support hardware, and other project-specific effects.
Drafting and CAD Considerations
For CAD or BIM work, model the pipe using the stated outside diameter and wall thickness rather than relying only on the nominal label. Confirm that connected fittings, flanges, valves, equipment nozzles, and support details use compatible dimensional references. The available DWG download can support drafting workflows, but downloaded geometry should still be checked against the project’s selected components and drawing standards.
Useful related references for this page include pipe schedules, NPS and DN pipe size conversions, steel pipe dimensions, pipe weight calculations, pipe supports, and nearby Schedule 40 pipe sizes. These links help readers move from a single size lookup to broader design and drafting checks.
Important Verification Before Use
Before procurement or fabrication, verify the material grade, manufacturing specification, end preparation, coating or lining, dimensional tolerances, and service requirements separately from the schedule designation. For pressure, stress, flexibility, support, or flow design, use the governing project code and qualified engineering review rather than treating a dimension table as a complete design approval.
Additional Questions About 4 Inch Schedule 40 Pipe
Are NPS 4 and DN100 interchangeable labels?
They are commonly used as corresponding nominal designations for this pipe size, but the labels do not replace the actual dimensional checks. Use the listed outside diameter, inside diameter, and wall thickness when coordinating components or drawings.
Does Schedule 40 define the pipe material?
No. Schedule 40 describes the dimensional wall-thickness series. Material grade, manufacturing requirements, corrosion resistance, and service limitations must be specified separately.
Should the pipe weight including water be used for every support calculation?
No. Select the applicable load condition. The pipe-only value and the listed water-filled value represent different reference conditions, and a complete support check may also require insulation, fittings, valves, contents, and other imposed loads.
Can the DWG file be used directly for fabrication?
The DWG is a drafting reference. Confirm its geometry, units, connection details, tolerances, and project-specific requirements before using it for fabrication or construction documentation.