Use this reference to identify the dimensional and weight data for NPS 2 1/2 Schedule 30 pipe, also designated DN65. The page brings the key outside diameter, inside diameter, wall thickness, and mass data together for piping layouts, estimating, fabrication review, and CAD work.
Because nominal pipe size is a designation rather than a direct measurement, confirm the actual outside diameter and wall thickness when checking clearances, fittings, supports, or connection details. The source table below is the controlling local reference for the listed values.
Schedule 30 pipe 2 1/2 inch (DN65) is a standard steel pipe size commonly used in piping design, drafting, fabrication, estimation, and industrial layout work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 2 1/2 Schedule 30 pipe based on ASME B36.10.
For engineers, designers, estimators, and CAD users, quick access to accurate pipe data helps improve piping layout, support planning, weight checks, transport review, and fabrication coordination during project development.
2 1/2 Inch Schedule 30 Pipe Dimensions
- Nominal Pipe Size (NPS): 2 1/2 inch
- Diameter Nominal (DN): DN65
- Outside Diameter (OD): 73 mm
- Wall Thickness: 4.78 mm
- Inside Diameter (ID): 63.44 mm
- Pipe Weight: 8.04 kg/m
- Pipe Weight Including Water: 11.19 kg/m
- Standard: ASME B36.10
Schedule 30 Pipe 2 1/2 Inch Data Table
| NPS | DN | Outside Diameter (OD) | Wall Thickness | Inside Diameter (ID) | Weight |
|---|---|---|---|---|---|
| 2 1/2 inch | DN65 | 73 mm | 4.78 mm | 63.44 mm | 8.04 kg/m |
Understanding 2 1/2 Inch Schedule 30 Pipe
2 1/2 inch Schedule 30 pipe is a standard steel pipe size used as a reference in industrial piping layouts, utility systems, water lines, process design studies, and CAD drafting. With an outside diameter of 73 mm and a wall thickness of 4.78 mm, this pipe size is suitable for light to medium piping applications where designers need a balance between flow capacity and pipe wall strength.
What Does Schedule 30 Mean?
Schedule 30 refers to the wall thickness series of the pipe. For NPS 2 1/2, Schedule 30 gives a wall thickness of 4.78 mm. The schedule affects the inside diameter, total pipe weight, fabrication planning, and compatibility with supports, fittings, and structural loading requirements.
Why These Pipe Dimensions Matter
Accurate pipe dimension data is important for piping layouts, spool drawings, support design, structural load review, and material takeoff. Knowing that this pipe weighs 8.04 kg/m helps with transport estimates, lifting plans, and support loading. If the pipe is filled with water, the total weight increases to 11.19 kg/m, which is useful for operating load calculations and support checks.
Common Uses of DN65 Schedule 30 Pipe
DN65 Schedule 30 pipe may be referenced in industrial utility systems, water transfer lines, plant layout studies, process piping documentation, and engineering design work. It is also useful for piping designers, CAD users, estimators, and procurement teams who need standard steel pipe dimensions for piping systems.
Difference Between NPS 2 1/2 and DN65
NPS 2 1/2 is the inch-based nominal pipe size designation, while DN65 is the metric nominal diameter reference. Both refer to the same pipe size category on this page. The actual standard outside diameter for this size is 73 mm.
How to Use This Data
You can use this page to quickly check:
- pipe outside diameter for layout and clearance
- inside diameter for flow reference
- wall thickness for schedule comparison
- weight per meter for estimation and transport planning
- water-filled weight for support and structural load review
Quick Reference for Schedule 30 Pipe 2 1/2 Inch
- Pipe Size: 2 1/2 inch
- DN: DN65
- OD: 73 mm
- ID: 63.44 mm
- Wall Thickness: 4.78 mm
- Weight: 8.04 kg/m
- Weight Including Water: 11.19 kg/m
- Reference Standard: ASME B36.10
Related Pipe Size Pages
Conclusion
Schedule 30 Pipe 2 1/2 Inch (DN65) is an important steel pipe reference for piping design, drafting, estimation, and fabrication work. With its 73 mm outside diameter, 4.78 mm wall thickness, and 8.04 kg/m pipe weight, it provides useful dimensional data for engineers and designers who need fast and accurate pipe information.
Note: NPS = Nominal Pipe Size, DN = Diameter Nominal. Dimensions and weights shown here are based on ASME B36.10 steel pipe data.
How to Read the Schedule 30 DN65 Data
The NPS 2 1/2 and DN65 labels identify the same nominal pipe size using inch-based and metric designations. They should not be treated as the measured outside diameter. For layout and drafting, use the listed 73 mm outside diameter; for a basic bore reference, use the listed 63.44 mm inside diameter.
Schedule identifies a wall-thickness series for a particular nominal pipe size. It is therefore important to read the schedule together with the NPS or DN designation rather than comparing schedule numbers alone. The listed 4.78 mm wall thickness also helps distinguish the pipe from other wall series during material takeoff and drawing review.
Practical Checks Before Using the Dimensions
- Use the outside diameter when checking physical clearance, clamps, sleeves, insulation space, and fitting interfaces.
- Use the inside diameter as a dimensional reference for bore and flow-related review; process calculations should use the project’s approved design basis.
- Use the pipe mass of 8.04 kg/m for preliminary material, handling, and support-load review.
- Use the listed water-filled mass of 11.19 kg/m when reviewing the stated filled condition. Other contents, coatings, insulation, valves, and fittings require separate accounting.
- Check the drawing or model units before transferring millimeter dimensions into CAD, BIM, or estimating software.
CAD and Drafting Guidance
For a CAD model, the outside diameter controls the basic cylindrical envelope, while the wall thickness can be used to represent the inside surface when a hollow model is required. Keep the nominal designation in the component or bill-of-materials description so the model remains identifiable during coordination.
The downloadable DWG can support drafting workflows, but users should still compare the file and drawing requirements with the project specification before issuing fabrication or construction documents. For related comparisons, see the existing references for Schedule 30 Pipe 2 Inch (DN50) and Schedule 30 Pipe 3 Inch (DN80).
Design-Use Limitation
Dimension and weight data support preliminary engineering checks, but they do not by themselves establish pressure rating, allowable stress, corrosion allowance, support spacing, hydraulic suitability, or code compliance. Those decisions require the applicable project specifications, material requirements, loading conditions, and engineering verification.
Frequently Asked Questions
What is the outside diameter of 2 1/2 inch Schedule 30 pipe?
The listed outside diameter is 73 mm. Use this value for basic layout, clearance, and envelope checks rather than relying on the nominal size label.
What is the inside diameter of DN65 Schedule 30 pipe?
The listed inside diameter is 63.44 mm. It is provided as a dimensional reference for the pipe bore and should not replace project-specific flow or process calculations.
What is the wall thickness?
For the pipe size shown on this page, Schedule 30 has a listed wall thickness of 4.78 mm.
How much does this pipe weigh?
The listed pipe weight is 8.04 kg/m. The listed weight including water is 11.19 kg/m; this filled-condition figure does not automatically include fittings, valves, coatings, insulation, or other contents.
Are NPS 2 1/2 and DN65 the same designation?
On this page, NPS 2 1/2 and DN65 identify the same nominal pipe size category. The actual measured dimensions are represented by the listed OD, ID, and wall thickness.
Which standard is referenced for these dimensions?
The source content identifies ASME B36.10 as the reference standard for the listed steel pipe data. Always confirm the governing project specification before procurement or fabrication.